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Biology 1 > Chapter 5 - ANATOMY Of Flowering Plants > Flashcards

Chapter 5 - ANATOMY Of Flowering Plants Flashcards

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1
Q

Tissues are classified into 2 groups - __________ and permanent .

A

Meristematic

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2
Q

Growth in plants is largely restricted to specialised regions of active cell division called _________ .

A

Meristems

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3
Q

The meristems that occur at the tip of roots and shoots and produce _________ are called APICAL MERISTEMS .

A

PRIMARY TISSUES

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4
Q

During the elongation of stem , some cells left behind from _________ constitute the axillary bud .

A

Shoot apical meristem

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5
Q

The meristem that occurs between mature tissues is known as _______ .

A

Intercallary meristem

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6
Q

_______ occur in grasses and regenerate parts removed by herbivores .

A

Intercallary meristems

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7
Q

______ and ________ are primary meristems because they appear early in the life of a plant and contribute to the primary plant body .

A

1 Apical meristem

2 intercallary meristem

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8
Q

The meristem that occurs in the mature regions of roots and shoots and produce woody axis -

A

Secondary or lateral meristem

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9
Q

_________ are cylindrical meristems .

A

Secondary or lateral

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10
Q

Fascilcular vascular cambium , interfascicular cambium and cork cambium produce ________ tissues .

A

Secondary tissues (becoz they are secondary cambiums)

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11
Q

Following divisions of cells in both ___________ and _______ meristems , the newly formed cells become specialised and loose the ability to divide and are called PERMANENT OR MATURE CELLS .

A

PRIMARY AND SECONDARY

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12
Q

During the formation of the primary plant body , specific regions of _________ produce dermal tissues , ground tissues and vascular tissues .

A

Apical meristem

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13
Q

Permanent tissues are divided onto _______ and _____ tissues .

A

Simple and complex

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14
Q

Permanent tissues having many different types of cells are called _________ .

A

Complex tissues

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15
Q

A simple tissue is made of how many types of cells -

A

Only 1

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16
Q

Parenchyma , collenchyma and sclerenchyma are __________permanent tissues .

A

Simple

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17
Q

Parenchyma forms the major component within ________ .

A

Organs

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18
Q

The cells of _______ are generally isodiametric ( maybe spherical ,oval , round , polygonal or elongated )

A

Parenchyma

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19
Q

The walls of parenchyma are ______ and made up of ______ .

A

Thin

Cellulose

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20
Q

Parenchyma have _______ intercellular spaces .

A

Small

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21
Q

The 3 functions performed by parenchyma are -

A

Photosynthesis
Storage
Secretion

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22
Q

The _______ occurs in layers BELOW THE EPIDERMIS in most o dicots .

A

Collenchyma

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23
Q

Collenchyma is found below the epidermis as a _________ layer or in ______.

A

Homogenous

Patches

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24
Q

Cells of collenchyma are much thickened at the corners dur to deposition of -

A

Cellulose
Hemicellulose
Pectin

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25
Q

___________ cells may be oval spherical or polygonal and often contain chloroplast .( out of simple permanent tissue cells )

A

Collenchymatous

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26
Q

Chollenchymatous cells assimilate food when they contain _______

A

Chloroplasts

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27
Q

They provide mechanical support to growing parts of the plants such as YOUNG STEMS AND PETIOLE OF A LEAF .

A

Collenchyma

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28
Q

______ consists of long, narrow cells with thick and lignified cell walls having few or numerous pits -

A

Sclerenchyma

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29
Q

Amount of pits present in sclerenchyma -

A

Few or numerous

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30
Q

Sclerenchyma are usually _____ and ________ protoplast .

A

Dead

Without

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31
Q

Out of fibres and sclerenchyma , high generally occur in groups .

A

Fibres

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32
Q

On the basis of variation in _____ , _____ , _______ and _____ ,sclerenchyma may either be fibres or sclereids .

A

Form
Structure
Origin
Development

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33
Q

Fibres are ______ walled , elongated and pointed generally occurring in ______ .

A

Thick

Groups

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34
Q

Sclereids are spherical ,oval or cylindrical , highly _________ dead cells with very _________ lumen (cavities ) .

A

Thickened

Narrow

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35
Q

Sclerenchyma are commonly found in ____________ of nuts , _______ of fruits like guava , pear and sapota , _________ of legumes and _______ of tea .

A

Fruit wall of nuts
Pulp of fruits
Seed coat of legumes
Leaves of tea

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36
Q

Name 3 fruits whose pulp consists of sclerenchyma .

A

Guava
Sapota
Pear

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37
Q

_____ and ________ constitute the complex tissues .

A

Xylem ad phloem

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38
Q

Function of sclerenchyma -

A

Provides mechanical support to organs

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39
Q

Xylem also provides _________ to plant parts .

A

Mechanical strength

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40
Q

The 4 xylem elements are -

A

Tracheids
Vessels
Xylem fibres
Xylem parenchyma

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41
Q

_______ lack vessels in their xylem .

A

Gymnosperms

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42
Q

___________ of xylem are ELONGATED OR TUBE LIKE CELLS WITH THICK AND LIGNIFIED WALLS AND TAPERING ENDS .

A

TRACHEIDS

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43
Q

Tracheids are living /dead -

A

Dead

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44
Q

In angiosperms _______ and _______ are the main water transporting elements .

A

Tracheids

Vessels

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45
Q

Vessel i a long cylindrical tube-like structure made up of many cells called _________ .

A

Vessel members

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46
Q

Vessel members have ________ walls and ________ central cavity .

A

Lignified

Large

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47
Q

Vessels have protoplasm . T/F

A

F . They are devoid of protoplasm -dead

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48
Q

__________ are interconnected through perforations in their common walls .

A

Vessel members

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49
Q

Presence of ________ is a characteristic feature of angiosperms .

A

Vessels

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50
Q

Xylem _____ have highly thickened walls and obliterated central lump .

A

Fibres

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51
Q

_______ may either be septate or aseptate .

A

Xylem fibres

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52
Q

Xylem ________ are living and thin -walled .

A

Parenchyma

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53
Q

Cell walls of xylem parenchyma are made up of -

A

Cellulose

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54
Q

Xylem _______ store food materials in the form of starch or fat and other substances like tannins .

A

Parenchyma -becoz they are the only living xylem element

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55
Q

The radial conduction of water takes place by _______ cells .

A

Ray parenchymatous

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56
Q

Perforations are present in which xylem element .

A

Vessels

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57
Q

Which have more diameter -vessels/tracheids -

A

Vessels

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58
Q

Primary xylem is of 2 types -________ and _________ .

A

Protoxylem

Metaxylem

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59
Q

The later formed primary xylem is called -

A

Metaxylem

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60
Q

In stems which type of primary xylem is found -

A

Endarch - centrifugal ( inside -> outside )

Protoxylem -inside
Metaxylem -periphery

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61
Q

In roots , which primary xylem type is found -

A

Exarch - centripetal ( outside ->inside )

Proto - periphery
Meta -centre

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62
Q

4 phloem elements are -

A

Sieve tube elements
Companion cells
Phloem parenchyma
phloem fibres

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63
Q

Gymnosperms lack _________ and ____________ . ( phloem elements )

A

Serve tubes

Companion cells

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64
Q

Instead of sieve tubes and companion cells , GYMNOSPERMS HAVE ___________ AND _________ .

A

Albuminous cells

Sieve cells

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65
Q

__________ are long , tube-like structures , arranges longitudinally and are associated with the companion cells .

A

Sieve TUBE elements

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66
Q

The end walls of which phloem element are perforated ?

A

Sieve tube elements

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67
Q

A mature sieve element possesses a __________ cytoplasm and a ________ VACUOLE but lacks a nucleus .

A

Peripheral

Large

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68
Q

Phloem element which lacks a nucleus -

A

Sieve tube

Has a large vacuole

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69
Q

The functions of sieve tube are controlled by nucleus of ________ .

A

Companion cells

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70
Q

The companion cells are specialised ________ cells .

A

Parenchymatous

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71
Q

The sieve tube elements and companion cells are connected by ____________ .

A

PIT FIELDS present between their common LONGITUDINAL WALLS

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72
Q

The companion cells help in maintaining _______ in sieve tubes .

A

Pressure gradient

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73
Q

Phloem _________ are made of tapering , cylindrical cells which have DENSE CYTOPLASM and NUCLEUS .

A

PARENCHYMA

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74
Q

The cell wall of phloem parenchyma is composed of _________ .

A

Cellulose

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75
Q

Phloem PARENCHYMA has cell wall with pits though which __________ exist between the cells .

A

Plasmodesmatal connections

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76
Q

Phloem _______ stores food materials and resin , latex and mucilage .

A

Parenchyma

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77
Q

Phloem _______ is absent in most MONOCOTS .

A

PARENCHYMA

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78
Q

Bast fibre is the other name for -

A

Phloem fibres

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79
Q

Phloem fibres are made up of __________ cells .

A

Sclerenchymatous

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80
Q

Phloem _________ are generally absent in primary phloem but are present in secondary phloem .

A

Fibres

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81
Q

These are much elongated , unbranched and have pointed , needle like apices -

(Among phloem elements )

A

Phloem fibres

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82
Q

At maturity , phloem ________ lose their protoplasm and become dead .

A

Fibres

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83
Q

Phloem fibres of _____,_____ and ______ are used commercially .

A

Jute
Flax
Hemp

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84
Q

On what basis is the classification of tissue system done ?

A

On the basis of STRUCTURE and LOCATION of the tissues .

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85
Q

3 types of tissue systems -

A

Epidermal
Ground / fundamental
Vascular /conducting

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86
Q

Which tissue system is also called GROUND TISSUE system -

A

Fundamental

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87
Q

Epidermal tissue system comprises ________ cells , _________ and the _______ appendages ( trichinosis and hairs ) .

A

Epidermal
Stomata
Epidermal

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88
Q

Stomata is mainly present in which tissue system -

A

Epidermal

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89
Q

Name the epidermal appendages of epidermal tissue system -

A

Trichomes

Hairs

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90
Q

The epidermis the outermost layer of the _______ plant body .

A

Primary plant body

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91
Q

Epidermis is made of elongated compactly arranged cells which form a _______ layer .

A

Continuous

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92
Q

Epidermis is usually _________ layered

A

Single

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93
Q

Epidermal cells are ________ in nature .

A

Parenchymatous

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94
Q

Epidermal cells have a small amount of _______ lining the cell wall and a large ______ .

A

Protoplasm

Vacuole

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95
Q

The outside of epidermis is covered with ____________ .

A

Cuticle

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96
Q

Cuticle is absent in the ___________ .

A

Roots

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97
Q

Stomata are present in the ________ of the leaves .

A

Epidermis

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98
Q

Stomata regulate the process of _____ and ______ .

A

Transpiration and gaseous exchange

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99
Q

In grasses _______are dumbbell-shaped. .

A

Guard cells

100
Q

Guard cells enclose the ________ .

A

Stomata pore .

101
Q

Inner walls of guard cells are ______ and outer ones _______ .

A

Thick

Thin

102
Q

_______ possess chloroplast .

A

Guard cells

103
Q

______ regulate the opening and closing of stomata .

A

Guard cells

104
Q

Subsidiary cells are a type of __________ cells

A

Epidermal

105
Q

Subsidiary cells are found in the vicinity of __________ .

A

Guard cells

106
Q

Sometimes , a few epidermal cells in the vicinity of guard cells become specialised in their _____ and ______ and are known as subsidiary cells .

A

Shape and size

107
Q

The 3 components of stomata apparatus are -

A

Stomata aperture
Guard cells
Subsidiary cells

108
Q

Root hairs are ________ elongation of the epidermal cells .

uni/multi cellular

A

Unicellular

109
Q

On the stem the epidermal hairs are called -

A

Trichomes

110
Q

The trichomes are _______ ( uni/multi cellular) elongation f the epidermal cells in the shoot system .

A

Multicellular

111
Q

Trichomes maybe branched/unbranched and soft or stiff .

T/F

A

T

112
Q

Function of trichomes -

A

Help in preventing loss of water due to transpiration

Are SECRETORY in function also

113
Q

Trichomes are secretory in function .T/F .

A

T

114
Q

The tissue system which consists of simple tissues ( parenchyma , sclerenchyma and collenchyma)-

A

Ground tissue system

115
Q

Type of cells present in the CORTEX ,PERICYCLE , PITH and MEDULLARY RAYS ( of the ground tissue system .)-

A

Parenchymatous cells

116
Q

Parenchymatous cells are present in the ground tissue of PRIMARY
________ and ________ .

A

Roots and stems

117
Q

In leaves , ground tissue consists of -

A

MESOPHYLL CELLS - thin walled chloroplast chloroplast containing cells.

118
Q

In dicots , _______ is present between xylem and phloem .

A

Cambium

119
Q

Why are vascular bundles in dicots referred to as open -

A

Becoz of the presence of cambium ,they possess the ability to form SECONDARY xylem and phloem

120
Q

Vascular bundles in monocots are called closed because -

A

The do not form secondary tissues .

121
Q

When the vascular bundles are arranged in an alternate manner along different radii , the arrangement is called -

A

Radial

122
Q

Radial vascular bundles are found in the -

A

Roots

123
Q

In _______ type of vascular bundles , xylem and phloem are jointly situated along the same radius .

A

Conjoint

124
Q

Conjoint vascular bundles are found in the ______ and ________ .

A

Stems and leaves

125
Q

_______ vascular bundles usually have the phloem situated outside xylem .

A

Conjoint

126
Q

The outermost layer of a dicot root -

A

Epiblema

127
Q

In dicot roots , cells of epiblema protrude in the form of unicellular ________ .

A

Root hair

128
Q

In dicot roots , the layer next to ( inside / under ) epiblema is -

A

Cortex

129
Q

The cortex of dicot roots , consists of several layers of thin walled ___________ cells with ___________ .

A

Parenchymatous

Intercellular spaces

130
Q

The cortex of dicot roots has intercellular spaces or not -

A

Yes , it has

But the innermost layer of cortex , endodermis is devoid of any intercellular spaces.

131
Q

The innermost layer of the cortex in dicot roots is-

A

Endodermis

132
Q

The endodermis of dicot roots , comprises ______ layers of BARREL-SHAPED cells .

A

Single

133
Q

The endodermis of dicots has intercellular spaces or not -

A

No

134
Q

The _______ and _______ walls of the endodermis of dicot roots has a layer of waxy Suberin .

A

Tangential

radial

135
Q

The endodermis has a water-impermeable way Suberin deposition in the form of _______ .

A

Casparian strips

136
Q

In dicot roots , the layer which lies next ( underneath / below ) endodermis is -

A

Pericycle

137
Q

Pericycle is composed of which cells and has how many layers?

A

Parenchymatous cells
Few layers
And is thick walled

138
Q

Initiation of lateral roots and vascular cambium during secondary growth in dicot roots takes place in the -

A

Pericycle ( parenchymatous cells )

139
Q

The nature of pith in dicot roots -

A

Small and inconspicious

140
Q

The parenchymatous cells which lie between XYLEM and PHLOEM in DICOT ROOTS are called -

A

Conjunctive tissue .

141
Q

There are usually ______ xylem and phloem patches in dicots roots

A

2-4

142
Q

During secondary growth in dicot roots , a ______ develops between xylem and phloem .

A

Cambium ring

143
Q

Functions of pericycle in dicot roots -

A

Initiation of lateral roots and vascular cambium during secondary growth .

144
Q

All the tissues on the inner side of ______ (in dicot roots ) constitute stele .

A

Endodermis

145
Q

Which tissues are included in STELE -

A

Pericycle
Vascular bundles
Pith

146
Q

Name all the layers of tissues in a dicot root from outside to inside -

A

Epiblema
Cortex
Endodermis ( innermost layer of cortex )
Pericycle
Vascular bundles ( 1 protoxylem ;2 metaxylem )
Pith -small

147
Q

Which have more vascular bundles- monocot or dicot ROOTS ?

A

Monocots

148
Q

There are usually ______ xylem bundles In a monocot root .

A

More than 6 -polyarch

149
Q

Type of pith found in monocot roots-

A

Large and well -developed

150
Q

Outermost layer of a dicot stem -

A

Epidermis

151
Q

Epidermis of dicot stems is covered with cuticle . T/F

A

T

152
Q

Epidermis of dicot stems may bear _______ and _______ .

A

Trichomes

Few stomata

153
Q

In dicot stems , the cells arranged between epidermis and pericycle constitute -

A

Cortex

154
Q

The cortex of dicot stems is present below which layer ?

A

Epidermis

155
Q

The cortex of _______ is divided into 3 sub -zones .

A

Dicot stems

156
Q

The first (outer) layer of the cortex of dicot stems -

A

Hypodermis

157
Q

The ________ just below the epidermis in dicot stems provides MECHANICAL STRENGTH TO YOUNG STEMS .

A

HYPODERMIS

158
Q

The hypodermis of dicot stems consists of a few layers of _________ cells .

A

Collenchymatous

159
Q

Th layer present below hypodermis in dicot stems ( 2nd layer of cortex ) -

A

Cortical layers -parenchymatous cells

160
Q

CORTICAL LAYERS below hypodermis consists of rounded thin -walled parenchymatous cells with ________ intercellular spaces .

A

Conspicuous

161
Q

The innermost layer ( below cortical layers ) of cortex-

A

Endodermis

162
Q

The endodermis of _______ is also called starch sheath because it is rich in starch grains .

A

Dicot stem

163
Q

In dicot stems , the layer just above pericycle -

A

Endodermis ( of cortex )

164
Q

The pericycle of dicots lies between -

A

Endodermis and phloem

165
Q

Pericycle in dicot stems is present above phloem in the form of semilunar patches of __________ cells .

A

Sclerenchymatous

166
Q

In dicot stems , IN BETWEEN VASCULAR BUNDLES THER ARE A FEW LAYERS OF RADIALLY PLACED _________ CELLS WHICH CONSTITUTE MEDULLARY RAYS .

A

PARENCHYMATOUS

167
Q

‘RING ARRANGEMENT OF VASCULAR BUNDLES ‘is a characteristic of -

A

Dicot stems

168
Q

Nature of pith in dicot stem-

A

Has large number of rounded , parenchymatous cells with large intercellular spaces .
So it is WELL -DEFINED

169
Q

The monocot stem has ________ hypodermis .

A

Sclerenchymatous

Dicot stem had collenchymatous

170
Q

monocot stem has ______ vascular bundles .

A

Scattered

171
Q

Monocot stem has vascular bundles surrounded by a sclerenchymatous ____ and a large conspicuous parenchymatous _____________ .

A

Bundle sheath

Ground tissue

172
Q

Bundle sheath of MONOCOT STEM has _______ cells .

A

SCLERENCHYMATOUS

173
Q

Phloem parenchyma is absent in -

A

Monocot stems

174
Q

_________ cavities are present within the vascular bundles of monocot stems -

A

Water -containing

175
Q

Water containing cavities present in vascular bundles is a characteristic of -

A

Monocot stems

176
Q

The 3 main parts of a dorsiventral leaf .

A

Epidermis
MESOPHYLL
Vascular system

177
Q

The upper surface and lower surfaces of a leaf are called -

A

Upper- adaxial

Lower-abaxial

178
Q

The _______ epidermis of a dorsiventral leaf generally has more stomata .

A

Abaxial -lower

179
Q

The ______ epidermis of a dicot leaf may lack stomata .

A

Adaxial

180
Q

The tissue between the lower and upper epidermis in a leaf is called-

A

MESOPHYLL

181
Q

_______ possess chloroplast and carries out photosynthesis .( the tissue layer of leaves )

A

MESOPHYLL

182
Q

MESOPHYLL of leaves is made up of -

A

Parenchyma

183
Q

The adaxial placed _______ parenchyma in a dicot leaf is made up of elongated cells which are arrANGED VERTICALLY AND parallel to each other .

A

Palisade

184
Q

The oval and loosely arranges _______ parenchyma is situated below palisade parenchyma .

A

Spongy

185
Q

Spongy parenchyma is present towards the ______ epidermis .

A

Lower -abaxial

186
Q

Vascular system n leaves can be seen in ___and ____.

A

Veins

Midrib

187
Q

On what factor does the size of vascular bundles in a dicot leaf depend ?

A

On the size of veins

The veins may vary in thickness in the RETICULATE venation of dicot leaves

188
Q

The vascular bundles in a dicot leaf are surrounded by a layer of thick walled _________ .

A

Bundle sheath cells

189
Q

The. MESOPHYLL is not differentiated into palisade and spongy in -

A

Monocot leaves

190
Q

In grasses , certain ______epidermal cells along the veins are modified into bulliform cells .

A

Adaxial

191
Q

Bulliform cells are ____ ,____ and ______ .

A

Large
Empty
Colourless

192
Q

When bulliform cells are _____ , the leaf surface is exposed .

A

Turgid

193
Q

When bulliform cells are _______ due to WATER STRESS leaves curl inwards to minimise water loss .

A

Flaccid

194
Q

The _____ in monocot leaves is reflected in the near similar size of vascular bundles ( EXCEPT IN MAIN VEIN )

A

Parallel venation

195
Q

The meristematic layer that is responsible for cutting off vascular tissues -

A

Vascular cambium

196
Q

In dicot stems , the cells of cambium present between primary xylem and phloem is the _______ cambium .

A

Intrafascicular

197
Q

The cells of _____ , adjoining the intrafascicular cambium become meristematic and form the interfascicular cambium .

A

Medullary rays

198
Q

The cells that the cambium ring cuts off towards the pith , mature into -

A

Secondary xylem

199
Q

Cells that te cambium ring cuts off towards the periphery mature into -

A

Secondary phloem

200
Q

The cambium is generally more active on the ________ side .

A

Inner side

201
Q

The amount of secondary xylem /phloem is more -

A

Secondary xylem

202
Q

The _______ phloem get gradually crushed due to the formation of secondary xylem.

A

Primary and secondary

203
Q

The cambium forms a narrow band of parenchyma which passes through the secondary xylem and the secondary phloem in the RADIAL direction . It is called -

A

Secondary medullary rays

204
Q

The activity of cambium is under the control of man environmental and _______ factors .

A

Physiological

205
Q

In ______ season cambium is very active .

A

Spring

206
Q

In spring season the cambium produces large number of xylary elements having __________ with wide cavities .

A

Vessels

207
Q

Early wood is formed during -

A

Sorting season

208
Q

The xylary elements produced has ______ vessels .

A

Narrow

209
Q

Autumn wood /late wood is produced during -

A

Winter

210
Q

The spring wood has _______ density and autumn wood has _______ density .

A

Lower

Higher

211
Q

Heartwood comprises ______ elements .

A

Dead

212
Q

Highly lignified walls are present in heartwood/sapwood .

A

Heartwood

213
Q

Sapwood/heartwood does not conduct water .

A

Heartwood

214
Q

Function of heartwood -

A

Gives support to the stem

215
Q

The peripheral region of secondary xylem is -

A

Sapwood

216
Q

Function of sapwood -

A

Conduction of water and minersls

217
Q

The greater part of secondary xylem is heartwood/sapwood -

A

Heartwood

218
Q

The wood that is hard,durable and resistant to the attack of insects -

A

Heartwood

219
Q

Heartwood if present in the ________ layers of the stem .

A

Central /innermost

220
Q

Heartwood has deposition of organic /inorganic compounds .

A

Organic

221
Q

Organic compounds like TANNINS ,RESINS OILS ,GUMS and AROMATIC substances are deposited in the -

A

Heatwood

222
Q

Cork cambium develops in the ______ region .

A

Cortex

223
Q

Phylogeny is the other name for -

A

Cork cambium

224
Q

Phellogen is a couple of layers _______ and is made of narrow thin-walled and rectangular cells .

A

Thick

225
Q

Phellogen cuts off cells on __ side .

A

Both sides

226
Q

The cells which the phellogen cuts on the OUTER SIDE differentiate into -

A

Cork /phellem

227
Q

The other name of cork -

A

PHELLEM

228
Q

The cells which the phellogen cuts on the inner side differentiate into -

A

Secondary cortex / phelloderm

229
Q

Other name for phelloderm -

A

Secondary cortex

230
Q

Cork is _______ to water due to Suberin deposition in the cell wall .

A

Impervious

231
Q

The cells of secondary cortex are ________ .

A

Parenchymatous

232
Q

Components of periderm -

A

Phellogen
Phellem
Phelloderm

233
Q

Due to activity of _________ ,pressure builds up on the remaining layers peripheral to PHELLOGEN and ultimately these layers die and slough off .

A

Cork cambium

234
Q

Bark refers to all tissues exterior to the -

A

Vascular cambium ( including secondary phloem )

235
Q

Which tissue types does bark include -

A

Periderm

Secondary phloem

236
Q

Bark that is formed ________ is called soft bark .

A

Early

237
Q

Lenticels are formed hen phellogen cuts off parenchymatous cells on the outer side instead of -

A

Cork cells

238
Q

When ______ cuts off parenchymatous cells on the outer side , lenticels are formed

A

Phellogen

239
Q

The parenchymatous cells rupture the ______ to form lenticels .

A

Epidermis

240
Q

Lenticels occur in most ______ trees .

A

Woody

241
Q

Role of lenticels -

A

Exchange of gases

242
Q

In dicot root , _________ is completely secondary in origi .

A

Vascular cambium

243
Q

In dicot roots , the vascular cambium originates from the tissue located just below the ___ bundles and above the ______ .

A

Phloem bundles ( a portion of pericycle )

Protoxylem

244
Q

In gymnosperms , secondary growth occurs in ___ and _____ -

A

Stems and roots

245
Q

Secondary growth does not occur in monocots/gymnos -

A

Monocots

Biology 1 (8 decks)

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