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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.
Which among the following is not a feature of pistil?
The method of embryo sac formation from a single megaspore is termed monosporic development and it is typically a feature of embryo sac and not pistil.
Cryopreservation is a technique to preserve substances like pollen grains in liquid nitrogen at temperature
Cryopreservation is to store pollen grains of a large number of species for years in liquid nitrogen at –196°C i.e. 77.15 Kelvin. Such stored pollen can be used as pollen banks, similar to seed banks, in crop breeding programmes.
Megasporangium is equivalent to:
Megasporangium is commonly called as ovule, arise from placenta inside ovary.
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