Describe the function of each generation in the life cycle of plants. What is th

Question

Describe the function of each generation in the life cycle of plants.

What is the dominant generation of a moss? Is this generation haploid or diploid?

What role does water play in the reproductive life cycles of nonvascular plants?

Is the moss sporophyte photosynthetic?

List the two means by which liverworts reproduce asexually.

What is the function of the rhizoids in plants?

Is the liverwort thallus haploid or diploid?

What is the function of elators in a liverwort?

Which is the dominant generation in all vascular plants?

What are an immature leaf and mature fern leaf called, respectively?

Is the prothallus in fern haploid or diploid? Does it produce gametes or spores?

What type of environmental conditions are required for the prothallus in fern to survive. Why?

What is the function of an indusium in fern?

Why are horsetails normally found growing along streams, rivers or irrigation ditches?

Are ferns better adapted to a land environment than mosses? Why or why not

How is the gametophyte generation in ferns similar to that of mosses? How is it different (aside from appearance)?

Compare and contrast moss and fern sporophytes.

Explanation / Answer

1) Life cycle of plant is known as alternation of generation. They key between haploid and diploid. The diploid generation is known as the sporophyte generation, which produces haploid spores by the process of meiosis and spores develop into a haploid generation by the process of mitosis. This is the gametophyte generation, which produces the gametes. The gametes combine and form a diploid zygote, which becomes a sporophyte.

2) The dominant generation of a moss is gametophyte and this generation is haploid. Mosses have the haploid gametophyte generation as the dominant phase of the life cycle.

3) Water plays an essential role in the reproductive life cycles of nonvascular plants. Water is required for them to swim to the egg. Sperm from the antheridia swim to the archegonia in the presence of water and the process of fertilisation occurs. It leads to the production of a diploid sporophyte. Fertilisation cannot occur without water.

4) The moss of sporophyte is not photosynthetic. The sporophyte generation is dependent on the photosynthetic gametophyte for nutrition. These sporophytes have no photosynthetic capabilities and are dependent on the gametophytes for the requirements of nutrition.

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