Section Number EXERCISE 15 Bryophytes and Seedless Vascular Plants POST-LAB QUES

Question

Section Number EXERCISE 15 Bryophytes and Seedless Vascular Plants POST-LAB QUESTIONS Introduction 1. Explain why water must be present for the bryophytes to complete the sexual portion of their life cycle. 2. Green al e believed to be the ancestors of the bryophytes. Cite four distinct lines of evidence to support this belief. b. d. 3. Complete this diagram of a "generic" alternation of generations sporoplhyee spore mother cells haplold (n) sperm 4. Describe in your own words the difference between a sporophyte and a gametophyte Bryophytes and Seedless Vascular Plants 289

Explanation / Answer

1. LIFE CYCLE: ( 2 stages)

stage 1 ( HAPLOIDAL)
1. The life starts from a haploid spore
2. the spore germinate and produce a protonema
3. gametofore with a stem and leaves grows from the protonema
4. from the tip of the stem of gametophore sex organs start to develop. ( male-antherida, and female - archegonia)

Note : Depending on the type and species sex organs may be located either on a single gametophore or on two separate gametophore.

Life Cycle - stage 2 (diploidal sporophyte)

1. Begins only when there is the presence of water. Otherwise fertilisation can't take place.
2. sperms swim down by the help of provided FLAGELLA and urgently in the presence of water from anthredia to the female organ- archegonia( through its neck)
3. fertilisation takes place leading to a formation of diploid sprophyte.

2. Answer:-

a. starch

b. chlorophyll

c. a,b,cartones

d. flagel structure

e. cell division

3. Life cycle of bryophytes

4.

Gametophyte: It is a multi cellular structure or generation in life cycle of a plant which is capable of forming gametes directly from its cells. The cells of gametophyte are always haploid or have single genomes or one set of chromosomes.

Sporophyte: It is a multicellular structure or generation in the life cycle of a plant which possess diploid cells or cells which two genomes or two sets of chromosomes. It produces haploid spores or meiospores through the process of meiosis in its diploid cells.

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