(a) Do all pollen grains remain viable for the same length of time? Support your answer with two suitable examples.
(b) How are pollen grains stored in pollen banks ? State the purpose of storing pollen grains in these banks.
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Answer:
No, all the pollen grains do not remain vaible for the same length of time.
• pollen grains are stored in liquid nitrogen.
Explanation:
• pollen grains do not remain viable for the same lenth of time, as each plant have different viablity period in pollen grains for example - rice and wheat lose their viablity within 30 minutes while solanaceae loses it in several months
• pollen grains can be stored for a longer duration in pollen banks in liquid nitrogen (-196°C) and a large number of rare species can be stored through this process.
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