Microsporangium is generally surrounded by 4 wall layers. Which of the following 3 wall layers perform the function of protection and help in the dehiscence of anther to release the pollen?
(1) Epidermis, tapetum, endothecium

(2) Epidermis, aril, endothecium

(3) Epidermis, endodermis, mesocarp

(4) Epidermis, middle layer and endothecium

Subtopic:  Stamen: Microsporangium |
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The above given diagram is an enlarged view of one microsporangium of a mature anther. Identify A, B and C
(1) A - Middle layer, B - Endothecium, C – Tapetum

(2) A - Endothecium, B - Tapetum, C - Middle layer

(3) A - Endothecium, B - Middle layer, C – Tapetum

(4) A - Tapetum, B - Middle layer, C - Endothecium

Subtopic:  Stamen: Microsporangium |
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Which of the following points is incorrect about sporopollenin?
(1) It is one of the most resistant organic material known

(2) It can withstand high temperature and strong acids and alkali

(3) 2 enzymes that degrade sporopollenin are known so far

(4) Pollen grains are well preserved as fossils because of presence of sporopollenin

Subtopic:  Stamen: Male Gametophyte |
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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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Which of the following sequences of development of embryo sac / female gametophyte is correct?
(1) Nucellus → Megaspore → Embryo sac

(2) Nucellus → Megaspore mother cell → Megaspore → embryo sac

(3) Nucellus → Megasporangium → Megaspore → Embryo sac

(4) Nucellus → Megagametophyte → Megaspore → Embryo sac

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

 

A

B

C

D

(a)

Synergid

Polar nuclei

Central cell

Antipodal cells

(b)

Antipodal cells

Polar nuclei

Central cell

Synergids

(c)

Antipodal cells

Polar nuclei

Megaspore mother cell

Synergids

(d)

Filiform apparatus

Polar nuclei

Central cell

Antipodal cell

Subtopic:  Pistil: Ovule |
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