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Biology 2 > Plant Physiology - Mixed Extras > Flashcards

Plant Physiology - Mixed Extras Flashcards

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1
Q

If OP=TP , then cell will be FULLY -

A

Turgid

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2
Q

What will be the effect on open stomata when , if relative humidity is 100% in atm?

A

Completely open

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3
Q

Transpiration is completely absent in -

A

Submerged hydrophytes

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4
Q

Xylem is associated with the translocation of ORGANIC NITROGEN .T/F

A

T

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5
Q

Osmosis is the movement of ____ from their lower conc to higher conc .

A

Solution

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6
Q

Root pressure develops to -

A

Active absorption

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7
Q

A column of water within xylem vessels of tall trees does not break under its weight because of -

A

Tensile strength of water

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8
Q

Which conditions favour guttation -

A

High water absorption

Low transpiration

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9
Q

Root pressure is maximum when -

A

Transpiration is low

Absorption is high

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10
Q

Due to increasing temperature, transpiration -

A

First inc then dec

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11
Q

If temperature is constant , then with increasing altitude , transpiration will -

A

Increase

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12
Q

Due to wind velocity , the transpiration rate will be -

A

First inc then dec

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13
Q

The most imp function of transpiration -

A

Cooling the plants

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14
Q

Most imp factor affecting transpiration-

A

Humidity

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15
Q

Which kind of transpiration is more common -

A

Stomatal

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16
Q

Conversion of starch to organic acid is essential for stomatal opening /closure ?

A

Opening

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17
Q

Inc in CO2 around leaf results in ____ of stomata .

A

Partial closure

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18
Q

% of water absorbed by herbaceous plants is lost in transpiration is -

A

99%

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19
Q

Conduction of water from root hair to root xylem is -

A

Apoplastic+symplastic

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20
Q

Dixon and jolly are associated with -

A

Cohesion and transpiration pull theory of ascent of sap

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21
Q

Water potential of a cell when it is placed HYPERTONIC solution -

A

Decreases

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22
Q

Best condition by which fully turgid cell can be identified is -

A

TP=OP

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23
Q

Direction of movement of water is from :
___OP - _____ OP
___DPD-____DPD
____DP-___DP

A

Low high
Low high
High low

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24
Q

Water from soil enters into root hairs on account of -

A

Suction pressure or DPD

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25
Q

Suctions pressure =

A

DPD

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26
Q

___ of NaCl solution will be HIGHER than ____ of sugar solution .

A

DPD

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27
Q

Water enters into root hair from soil because the osmotic pressure of SOIL -

A

Remains lesser Than that of root hair sap

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28
Q

One molar solution of which substance will have max OP-

A

Glucose

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29
Q

_______ uptake of minerals depends on DEPHOSPHORYLATION .

A

Active

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30
Q

Little leaf disease is cased by -

A

Zn

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31
Q

Which mineral is essential for N2 metabolism ?

A

Mo

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32
Q

The most abundant element present in plants -

A

C

note- the most abundant element present in any living organism is C

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33
Q

Gray spots of oats are caused due to deficiency of -

A

Mn

34
Q

The major portion of dry weight of plants comprises of -

A

C , H , O2

35
Q

About 98% of the mass of every living organism is composed of just 6 elements - name them - (aipmt)

A

C , H , N , O2 , Ca , P

36
Q

Mn is req in -(aipmt )

A

Photolysis of H2O during photosynthesis

37
Q

The common N2 fixer in paddy fields is -(aipmt)

A

Oscillatoria

38
Q

A prokaryotic autotrophic N2 fixing symbionts is found in -(aipmt)

A

Cycas

39
Q

Name 2 free-living ans symbiotic N2 fixers -(aipmt)

A

Azotobacter

Rhizobium

40
Q

What is nitrate assimilation?

A

Reduction of NO3-

41
Q

Anaerobic N2 fixing organisms -

A

Clostridium
Rhodospirillum
Rhodoseudomonas

42
Q

Passive absorption of ions usually occurs through -

A

Ion channels

43
Q

Denitrification results in _______ in N2 content in soil .

A

Dec

44
Q

Any mineral ion conc in tissues that reduces the dry weight of tissues by about 10% is considered - critical conc / toxic conc. ?

A

Toxic conc

45
Q

Mineral absorption is mostly ______.

A

Active

46
Q

Premature fall of leaves and buds is a mineral deficiency symptom occurring in the region where soil is deficient in -

A

P

47
Q

During photosynthesis , o2 in glucose comes from -

A

CO2

48
Q

The path of co2 in te dark was successfully traced by the use of which isotope -

A

O18

49
Q

Wavelength of light responsible for EMERSON’S enhancement effect -

A

Both above 680nm and below 680nm

50
Q

PS1 occurs in -

A

STROMA thylakoids and non-Appressed parts of grana thylakoids

51
Q

PS2 occurs in -

A

Appressed parts of grana thylakoids

52
Q

Formula of chloro a -

A

C55 H72 O5 N4 Mg

53
Q

Which colour of light gives max absorption peak by chloro a -

A

Blue light

54
Q

Number of pigment molecules in quantosome -

A

250 - 400

55
Q

ADP + iP = ATP in grana is called -

A

Photophosphorylation

56
Q

At the time of splitting of H2O , which initially captures the e-?

A

Chlorophyll

57
Q

The 1st e- carrier for an e- excited from P700 -

A

FeS protein / Ferridoxin

58
Q

C4 plants are found among dicots or monocots ?

A

Both

59
Q

C4 plants are adapted to -

A

Hot and dry climate

60
Q

Bundle sheath cells of C4 are -

A

Large and Agranal

61
Q

What was used durin discover of Calvin cycle ?

A

Chlorella

62
Q

Solarisation is -

A

Destruction of chlorophyll

63
Q

As compared to c3 plants , how many additional ATPs are needed for net production of 1 molecule of hexose sugar by C4 plans ?

A

12

64
Q

Etiolated plants are formed due to lack of -

A

Light

65
Q

C2 cycle is also called -

A

Glycolate cycle

66
Q

In C3 plants , the 1st stable product of photosynthesis during dark rxn is -

A

3-phosphoglyceric acid

67
Q

Maize is a c3 plant . T/F

A

F

It s a C4 plant

68
Q

In PS1 , the 1st e- acceptor is - (aipmt)

A

An Fe-S protein

Ferridoxin

69
Q

During photorespiration ,the O2 consuming rxns occur in -

A

STROMA of chloroplast and peroxisomes

Not in mito

70
Q

The C4 plants are photosynthecially more efficient than C3 plants becoz -(aipmt)

A

They have more chloroplasts

71
Q

Chromatophores take part in -

A

Photosynthesis

72
Q

A plant in your garden AVOIDS PHOTORESPIRATORY LOSSES ,has improved water us efficiency , shows high rates of photosynthesis at high temp and has improved efficiency of N2 utilisation ? (aipmt)
Is it c3, C4 or CAM ?

A

C4

73
Q

Why C4 plants are more efficient ? (aipmt)

A

They have a mechanism of conc CO2 at the place of RubisCo enzyme action

74
Q

O2 is not produced during photosynthesis by -

A

Green S bacteria

75
Q

C3 pants have been used as greenhouse crops for higher yields becoz -

A

Current availability of co2 is limiting to c3 plants

76
Q

Photosynthetic photosystem consist of -

A

Both LHC and rxn centre

77
Q

How much energy in terms of ATP equivalents is consumed in the photosynthetic production of a mole of hexose -

A

54 ATP

78
Q

Presence of what (2 things) specifies that z-scheme is found not in grana lamella -

A

PS2

NADP reductase

79
Q

In CAM plants , photophosphorylation occurs ___ during ___.

A

MESOPHYLL cells

Day time

80
Q

How many quanta of light are req per NADPH + H+ formation ?

A

4 quanta

81
Q

The number of ATP and NADPH req per CO2 in the 3 steps of Calvin cycle individually -

A

Carboxylation - 0 atp 0 nadph
Reduction -2 atp 2 nadph
Regeneration - 1 atp 0 nadph

82
Q

LHC are made of ____ pigment molecules bound to proteins .

A

Hundreds (250- 400 )

Biology 2 (10 decks)

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