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Biology > Sexual Reproduction in Flowering Plants > Flashcards

Sexual Reproduction in Flowering Plants Flashcards

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1
Q

All flowering plants do not show sexual reproduction - true/false

A

False - all flowering plants show sexual reproduction

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2
Q

Microsporophyll of flower

A

Stamen

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3
Q

Enzyme which dissolves pollen tetrad

A

Callase enzyme

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4
Q

Changes which lead to development of flower

A

Hormonal and structural changes

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5
Q

In 60% of flowering plants

A

Pollen are released in 2 celled stage

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6
Q

Anther is generally

A

Bilobed

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7
Q

The _______ end of filament is attached to the ________ or __________ of the flower

A

Proximal, thalamus or petal

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8
Q

Bilobed nature of anther is very distinct in ________ section of anther

A

Transverse

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9
Q

Pollen sacs are developed

A

Microsporangia

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10
Q

Microsporangia extend longitudinally all through the length of anther and are packed with pollen - true/false

A

True

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11
Q

Layer which nourishes pollen

A

Tapetum

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12
Q

Cells of tapetum possess

A

Dense cytoplasm and more than one nucleus

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13
Q

Function of epidermis, endothecium and middle layers

A

Protection and help in dehiscence of anther

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14
Q

In young anthers, centre of microsporangium is occupied by

A

Compactly arranged homogenous cells called sporogenous tissue

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15
Q

Microspore tetrads are formed from

A

Cells of sporogenous tissue

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16
Q

Each cell of sporogenous tissue is

A

Microspore mother cell/pollen mother cell

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17
Q

Male gametophyte of angiosperms

A

Pollen grain

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18
Q

Shape and size of pollen grain

A

Spherical, 25-50 micrometers in diameter

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19
Q

Intine is a

A

Thin and CONTINUOUS layer made of cellulose and pectin

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20
Q

Cytoplasm of pollen is surrounded by

A

Plasma membrane

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21
Q

When pollen grain is mature, it contains

A

2 cells - vegetative + generative

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22
Q

The generative cell is

A

Small, spindle shaped and floats in cytoplasm of vegetative cell

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23
Q

Vegetative cell has

A

Large irregularly shaped nucleus

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24
Q

Pollen allergy causing weed

A

Parthenium/carrot grass

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25
Q

Parthenium was introduced in India as

A

Contaminant with imported wheat

26
Q

Viability time of pollen in cereals like rice, wheat

A

30 minutes

27
Q

Viability time of pollen in Rosaceae, Leguminoseae, Solanaceae

A

Few months

28
Q

Cryopreservation temperature

A

-196 C

29
Q

Cavity in ovary of flower is called

A

Locule

30
Q

Parts of pistil

A

3 parts - stigma, style, ovary

31
Q

Placenta is located

A

Inside locule

32
Q

Hilum is where

A

Body of ovule fuses with funicle

33
Q

Ovule generally has ________ embryo sac(s) formed from ______________

A

Single, megaspore

34
Q

Development of embryo sac from a single megaspore is known as

A

Monosporic development

35
Q

Megaspore mother cell is formed in

A

Micropylar region

36
Q

Pollination is

A

Transfer of pollen from anther to stigma

37
Q

Plants producing both cleistogamous and chasmogamous flowers

A

Viola (common pansy), oxalis, commelina

38
Q

Geitonogamy is functionallly ___________ and genetically ________________

A

Cross pollination, self pollination

39
Q

Majority of plants use __________ agents for pollination

A

Biotic

40
Q

Pollination by __________ is more common among abiotic pollinators

A

Wind - anemophily

41
Q

Tassels of corn cob are

A

Stigma and style

42
Q

Pollination by water is limited to

A

30 genera, mostly monocots

43
Q

Examples of water pollinated plants

A

Vallisneria, hydrilla (fresh water), Zostera (marine grasses)

44
Q

Pollination in water hyacinth and water lily

A

Insect/wind

45
Q

Pollination in vallisneria occurs at

A

Surface of water

46
Q

In sea-grasses, pollination occurs

A

Inside water

47
Q

Pollen grains of sea grasses are

A

Long, ribbon like

48
Q

In most water pollinated species, pollen grains are covered by

A

Mucilaginous covering

49
Q

Flowers pollinated by flies and beetles

A

Secrete foul smelling odour

50
Q

Floral rewards are

A

Nectar and POLLEN GRAINS, safe place to lay eggs (Amorphophallus - 6 feet)

51
Q

Self - incompatibility is a

A

Genetic mechanism

52
Q

Unisexual monoecious flowering plants

A

Castor, maize

53
Q

Unisexual dioecious flowering plants

A

Papaya

54
Q

Endosperm is non persistent in

A

Pea, groundnut, beans

55
Q

Persistent endosperm is found in

A

Castor, coconut, wheat, maize, barley

56
Q

Embryonic development stages

A

Zygote ——–> proembryo ————> globular embryo————> heart shaped embryo ———-> mature embryo

57
Q

Perispermic seeds are present in

A

Black pepper, beet

58
Q

False fruits examples

A

Apple, strawberry, cashew

59
Q

Oldest viable seed is

A

Lupinus arcticus - arctic tundra - flowered after 10000 years of dormancy

60
Q

Species showing apomixis

A

Asteraceae, grasses

61
Q

Difference between apomixis and parthenocarpy

A

Apomixis - formation of seeds without fertilization

Parthenocarpy - formation of seedless fruits without fertilization

62
Q

Fruits showing polyembryony

A

Citrus, mango

Biology (10 decks)

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