AP BIOLOGY

PLANTS

ALTERNATION OF GENERATIONS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Algae, and all plants reproduce using:
A
The alternation of generations
B
Only asexual reproduction
C
Only sexual reproduction
D
Diploid gametes
Explanation: 

Detailed explanation-1: -Alternation of generations is common in plants, algae, and fungi. This can be compared to the sexual reproduction in animals where both haploid and diploid cells are found in every generation. Plants alternate between the diploid sporophyte and haploid gametophyte, and between asexual and sexual reproduction.

Detailed explanation-2: -Nontracheophyte plants including the liverworts, hornworts and mosses undergo an alternation of generations; the gametophyte generation is the most common.

Detailed explanation-3: -Alternation of generations which is also known as metagenesis is the type of life cycle that occurs in those plants and algae in the Archaeplastida and the Heterokontophyta so as to have diverse haploid sexual and diploid asexual stages.

Detailed explanation-4: -All plants have a characteristic life cycle that includes alternation of generations. Plants alternate between haploid and diploid generations. Asexual reproduction with spores produces haploid individuals called gametophytes, and sexual reproduction with gametes and fertilization produces the diploid sporophyte.

Detailed explanation-5: -In algae, fungi, and plants, alternation of generations is common. It is not always easy to observe, however, since one or the other of the generations is often very small, even microscopic.

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