jeanbeansmith2p2ofty
22.02.2021 •
Biology
What are the reproductive organs of
flowering plants (angiosperms?
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Ответ:
The pollen grain which contains 3 haploid nuclei (2 sperm nuclei and 1 tube nucleus) for the male and the carpels which carry the ovary containing the ovule which further undergoes meiosis to produce an ovum/haploid egg cell for the females.
Explanation:
During fertilization,one of the two sperm nuclei inside the pollen tube fertilizes the ovum to form the embryo/seed. The second sperm nucleus fertilizes the diploid pollar nucleus to form the triploid (3n) endosperm. This is known as "double fertilization" which occurs only in angiosperms and not in gymnosperms.
Ответ:
The amount of heat radiated from the atmosphere to the surface is equivalent to 100 percent of the incoming solar energy.