Question

explain about double fertilization​

Answer 1

Answer:

• Double fertilization involves two sperm cells; one fertilizes the egg cell to form the zygote, while the other fuses with the two polar nuclei that form the endosperm.

• After fertilization, the fertilized ovule forms the seed while the tissues of the ovary become the fruit.

Answer 2

Answer:

(a) The atmosphere acts as a blanket and Keeps the average ter ofte ens day and night and even during the course of the year

(b) Oxygen present in the atmosphere is essential for respiration and combustion whereas con dioxide is essential for photosynthesis.

(c) Rain and rainfall patterns are decided by the atmosphere

(d) Ozone layer present in the atmosphere absorbs ultraviolet rays and thus protects ung organismsfrom their harmful effects.

Explanation:

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