Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
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.
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?
Microsporangium is generally surrounded by four wall layers– the epidermis, endothecium, middle layers and the tapetum. The outer three wall layers perform the function of protection and help in dehiscence of anther to release the pollen. The innermost wall layer is the tapetum. It nourishes the developing pollen grains.
(page-21)
Which of the following points is incorrect about sporopollenin?
Correction for statement C: No enzyme that can degrade sporopollenin is known so far.
(page-23)
The viability of pollen grains depends upon:
The period for which pollen grains remain viable is highly variable and to
some extent depends on the prevailing temperature, humidity and genetic
potentiality of species..
(page-24)
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