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Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS

हिन्दी

Cryopreservation of pollen grains for years in pollen banks for crop breeding programmes is carried out at which temperature?

  1. -196 °C in liquid nitrogen
  2. -80 °C in liquid helium
  3. -120 °C in dry ice
  4. -196 °C in liquid oxygen

Correct answer · Option 1

-196 °C in liquid nitrogen

Explanation

Pollen grains of a large number of species can be stored for years in liquid nitrogen at -196 °C in pollen banks.

Related questions

Consider the following statements regarding seeds: Statement I: Albuminous seeds retain a part of the endosperm as it is not completely consumed during embryo development. Statement II: In non-albuminous seeds such as castor and maize, the endosperm is completely consumed during embryo development. In the light of the above statements, choose the correct answer:→Read the following statements about pollination by water: Statement I: Pollination by water is quite common in flowering plants and occurs in over 200 genera of both dicots and monocots. Statement II: The distribution of some bryophytes and pteridophytes is limited because of the requirement of water for transport of male gametes and fertilisation. Choose the correct option:→In the given three-dimensional cut section of an anther, which structure is responsible for the release of pollen grains upon maturity?→In angiosperms, what is the primary biological significance of the delay in zygote division until a certain amount of endosperm has developed?→
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