Test Preparation on Biology-Sexual Reproduction in Flowering Plants
1.
Which one of the following is resistant to enzyme action?
The exine of pollen is made up of sporo
2.
In angiosperm, all 4 microspores of a tetrad are covered by a layer that is formed by
The microspores are covered by callose. Callose layers are formed inner to cell wall of micromole mother cells and separate them. After meisin, tetrad formation the pollen mother cell, surrounded by same callose.
3.
How many pollen grains are formed from 10 microspore mother cells by meiosis?
1microspore mother cell, 1microsis, 4pollen 10 microspore mother cells 10 meiotic divisions, 10
4.
An ovule that becomes curved so that the nucellus and embryo sac lies at right angles to the funicle is
This condition is seen in Carnpylotropous ovules of Fabaceae
5.
Wind pollination is common in
Grasses have exerted stamens/ exposed to air, feathery stigmas stamens are versatile all favouring wind pollination.
6.
Endosperm is consumed by developing embryo in the seed
The answer must be non-endospermic / ex-albumianous seeds. Eg. Legumes
7.
Which of the following is surrounded by a callose wall?
The microspores are covered by callose. Callose layers are formed inner to cell wall of micromole mother cells and separate them. After meisin, tetrad formation the pollen mother cell, surrounded by same callose.
8.
Male gametes in angiosperms are formed by the division of
Generative cell divides by mitosis forming two non-motile male gametes. In most angiospermic families this division occurs in the pollen tube after germination of pollen grains (60%). In remaining 40% families pollen is shed in 3 celled with one vegetative cell and two male gametes.
9.
The pollen grain is
If it is 2 celled at time of release pollen is partially developed male gametophyte, if 3cells it is fully developed male gametophyte.
10.
Which of the following is a correct statement?
Spores and gametes are haploid. Spores germinate to form haploid gametophytic Stapes. Spore is the first cell of gametophytic generation.
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