Practice free Sexual Reproduction in Flowering Plants (Botany) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
How tapetal cells become binucleate?
Tapetal cells generally have more than one nucleus. They become bi-nucleate by multiple cell fusions of unicellular cells, this is referred to as endomitosis.
Which among the following is incorrect with respect to microsporogenesis?
The cells of sporogenous tissue undergo meiotic divisions to form microspore tetrads.
The inner wall of pollen grains is made up of
The inner wall of the pollen grain is called the intine. It is a thin and continuous layer made up of cellulose and pectin. (page- 23)
The pollen grains are shed at two-celled stage in
In over 60 per cent of angiosperms, pollen grains are shed at this 2-celled stage. In the remaining species, the generative cell divides mitotically to give rise to the two male gametes before pollen grains are shed (3-celled stage).
Which among the following is referred to as male gametophyte?
The pollen grains represent the male gametophytes.
Which among the following is incorrect with respect to vegetative cell of pollen grain?
Generative cell is small and spindle-shaped with dense cytoplasm.
The diameter of pollen grain generally varies from:
Pollen grains are generally spherical measuring about 25-50 micrometers in diameter.
The outer layer exine is made up of:
The hard outer layer called the exine is made up of sporopollenin which is one of the most resistant organic material known.
Which among the following is not true about pollen grain?
Parthenium or carrot grass that came into India as a contaminant with imported wheat, has become ubiquitous in occurrence and causes pollen allergy.
In angiosperms, viability of pollen grains generally depend on
The period for which pollen grains remain viable is highly variable and to some extent depends on the prevailing temperature and humidity.
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