The above diagram shows some stages in microgametogenesis. Identify A, Band C:
               A                               B                              C
(1) Symmetric spindle        Generative cell           Vegetative cell

(2) Symmetric spindle        Vegetative cell           Generative cell

(3) Asymmetric spindle       Vegetative cell           Generative cell

(4) Asymmetric spindle       Generative cell           Vegetative cell

Subtopic:  Stamen: Male Gametophyte |
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Which of the following statements is false?
 

I. Pollen grains represents male gametophyte
II. In angiosperms partially developed male gametophytes are pollinated
III. Generative cell is siponogenous while vegetative cell is spermatogenous
IV. Formation and differentiation of pollen grains is called microsporogenesis
V. Hay fever is a pollen allergy
VI. Pollen grains of some plants produce severe allergy and respiratory or bronchial diseases
VII. Pollen grains are poor in nutrients.


1. I and VII         

2. III and VII      

3. IV and V         

4. VI and VII

Subtopic:  Stamen: Male Gametophyte |
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The viability of pollen grains depends upon:
(1) Prevailing temperature

(2) Prevailing humidity

(3) Genetic potentiality of the concerned species

(4) All of the above

Subtopic:  Stamen: Male Gametophyte |
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Which of the following has the least pollen viability?

(1) Cereals like wheat and rice          

(2) Members of Rosaceae

(3) Members of Leguminoseae           

(4) Members of Solanaceae

Subtopic:  Stamen: Male Gametophyte |
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Match the Column-I with Column-II:
    Column-I                                          Column-II
A. Funicle                                 I. Mass of cells within ovule with more food
B. Hilum                                  II. Basal part of ovule
C. Integument                        III. One or 2 protective layers of ovule
D. Chalaza                              IV. Region where body of ovule fuses with funicle
E. Nucellus                               V. Stalk of ovule
(1) A - I, B - II, C - III, D - IV, E - V           

(2) A - V, B - IV, C - III, D - II, E - I

(3) A - IV, B - II, C - I, D - III, E - V           

(4) A - I, B - III, C - V, D - II, E - IV

Subtopic:  Pistil: Ovule |
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Identify A, B, C and D structures shown in above diagram of female gametophyte:

A B C D
1. Synergid Polar nuclei Central cell Antipodal cells
2. Antipodal cells Polar nuclei Central cell Synergids
3. Antipodal cells Polar nuclei Megaspore mother cell Synergids
4. Filiform apparatus Polar nuclei Central cell Antipodal cell

Subtopic:  Pistil: Ovule |
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Geitonogamy is:
(1) Functionally cross pollination involving a pollinating agent

(2) Genetically it is similar to autogamy since the pollen grains come from the same plant

(3) Functionally and genetically autogamy

(4) Both (a) and (b) are correct

Subtopic:  Pollination & Outbreeding Devices |
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Go through the following statements:

Flowers are bisexual and homogamous maturing anther and stigma of a flower at the same time.

Mechanical devices bringing anthers and stigma close together in a bisexual chasmogamous flower.

Cleistogamy (bisexual flowers remain closed)

Anther and stigma of an intersexual flower mature in bud condition.

The above contrivances favour:

(1) Allogamy                  

(2) Autogamy       

(3) Xenogamy      

(4) Cross pollination

Subtopic:  Pollination & Outbreeding Devices |
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Go through the following statements:

a. Flowers are small. They are often packed in inflorescence

b. Flowers are colourless, nectarless and odourless

c. Well exposed stamens

d. Pollen grains - produced in large number, light, non-sticky

e. Flowers often have a single ovule in each ovary

f. Stigma - large, often feathery.

The above contrivances favour:

1. Self pollination                             

2. Anemophily

3. Ornithophily                                 

4. Entemophily

Subtopic:  Pollination & Outbreeding Devices |
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Find out the correct option:
(1) Among animals, insects, particularly bees are the dominant biotic pollinating agents

(2) Often flowers of animal- pollinated plants are specially adapted for particular species of animals

(3) In some species floral rewards like edible nectar, pollen grains, shelter for egg laying are given to pollinating animals

(4) All the above are correct

Subtopic:  Pollination & Outbreeding Devices |
 91%
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