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The hard outer layer of pollens, named exine, is made of
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Important Questions on Sexual Reproduction in Flowering Plants
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Observe the diagram of the young anther given below:
Identify the parts labelled as A, B, C and D.
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A- Endothecium
B- Tapetum
C- Epidermis
D- Middle Layer
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Why meiosis is essential at the time of sporogenesis in angiosperms? Explain the process of formation of male gametophyte in angiosperms with suitable diagrams.
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(A) Disassociation of microspore as pollen grains
(B) Anther maturation and dehydration
(C) Pollen mother cell undergoes meiotic division
(D) Microspore tetrad
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Assertion Xenogamy involves transfer of pollen grains from the flower of one plant to the stigma of another plant.
Reason This is the only type of pollination which brings genetically different types of pollen grains to the stigma.
The correct answer is:
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Mateh the following?
| Column - I | Column - II | Column - III | |||
| (a) | Epidermis | (i) | Multi nucleated | (p) | Protection |
| (b) | Endothecium | (ii) | Homogenous | (q) | Formation of Micropores |
| (c) | Tapetum | (iii) | One celled thick | (r) | dehiscence of anther |
| (d) | Sporogenous tissue | (iv) | Fibrous thickness | (s) | Nourishment |
MEDIUM
A) Several hormonal and structural changes are initiated for the development of floral primordium.
B) Each anther will have two sporangia at the sides.
C) Stomium will be useful for the dehiscence of pollen sacs.
D) Pollen grains can be stored at .
E) Pollen viability in rice will be days.
