AP BIOLOGY

PLANTS

BRYOPHYTES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why do bryophytes have to be around water part of the year?
A
So they are able to stay wet
B
So they can anchor in the soil better
C
So the sperm can swim to the egg.
D
So they can tolerate low temperatures
Explanation: 

Detailed explanation-1: -Bryophytes also need a moist environment to reproduce. Their flagellated sperm must swim through water to reach the egg. So mosses and liverworts are restricted to moist habitats.

Detailed explanation-2: -Bryophytes are dependent on water for survival and reproduction. Water is necessary for sexual reproduction in Bryophytes as sperms swim to the eggs to fertilize it.

Detailed explanation-3: -The completion of the bryophyte and pterophyte life cycle requires water because the male gametophyte releases sperm, which must swim-propelled by their flagella-to reach and fertilize the female gamete or egg.

Detailed explanation-4: -Bryophytes have neither pollen nor flowers and rely on water to carry the male gametes (the sperm) to the female gametes (the eggs). The spore capsules are produced after the sperm have fertilized the eggs.

Detailed explanation-5: -Gametophytes of dioecious bryophytes are unisexual, producing either eggs or sperm, but not both. Males and females compete for space but require close proximity for sexual reproduction. By contrast, gametophytes of monoecious bryophytes are bisexual, able to produce both eggs and sperm.

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