Choose the correct statement.
Choose the correct statement.
The correct options are
B In bryophytes and pteridophytes fertilisation occurs in presence of water.
C In spermatophytes pollen grains acts as sperm carriers.
D The number of male gametes produced are several thousand times to female gametes in most organisms.
In most organisms the male gamete is small and motile while the female gamete is non-motile and large because it has to nourish the growing embryo. However, there are many species of algae in which both the male and female gametes are motile. Bryophytes and pteridophytes necessarily require water for their reproduction as the motile male gametes need moisture or liquid medium to reach the female gamete. In spermatophytes or flowering plants pollen grains are the male gametophyte which carry the male gametes. Evolution has established a general trend among organisms in which male gametes are produced in large numbers as compared to number of female gametes.
B
In bryophytes and pteridophytes fertilisation occurs in presence of water.
C
In spermatophytes pollen grains acts as sperm carriers.
D
The number of male gametes produced are several thousand times to female gametes in most organisms.
In most organisms the male gamete is small and motile while the female gamete is non-motile and large because it has to nourish the growing embryo. However, there are many species of algae in which both the male and female gametes are motile. Bryophytes and pteridophytes necessarily require water for their reproduction as the motile male gametes need moisture or liquid medium to reach the female gamete. In spermatophytes or flowering plants pollen grains are the male gametophyte which carry the male gametes. Evolution has established a general trend among organisms in which male gametes are produced in large numbers as compared to number of female gametes.
