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

ID: 210622 • Letter: N

Question

Name Section Number EXERCISE 15 Bryophytes and Seedless Vascular Plants POST-LAB QUESTIONS Introduction y water must be present for the bryophytes to complete the sexual portion of their life cycle. 1. Expla Green algae are believed this belief to be the ancestors of the bryophytes. Cite four distinct lines of evidence to support 2. b. d. 3. Complete this diagram of a "generic" alternation of generations. mature sporophyte spore mother oolls ME OS S haploid (n) sperm 4. Describe in your own words the difference between a sporophyte and a gametophyte. Bryophytes and Se less Vascular Plants 289

Explanation / Answer

Ans. 1

Bryophytes need water to reproduce, as they usually live in moist places. However, they wait for rainy period to reproduce, because they need water to carry sperm to the eggs. When, a bryophyte spore settles somewhere, it grows into a gametophyte. Gametophyte reproductive organs are called antheridia (male), and archegonia ( female). Antheridia make sperm and Archegonia make egg. When it’s raining more than ever, the eggs stays, meanwhile the sperm take ride on the rainwater and seek out eggs.

Ans 2.

Bryophytes are originated more than 430 million years ago, during the Silurian period. Many bryophytes arose from an ancestor in the green algal order Charales or Coleochaetales based on biochemical, morphological, and life history comparisons.

Answer 4.

Difference between Gametophyte and Sporophyte

Gametophyte

Sporophyte

Haploid phase(n) life cycle

It form gametes

Gametes are formed directly or through the mitosis.

Growth of zygote produces the sporophyte.

Cell possess a single genome or a set of chromosome.

Diploid phase (2n) lofe cycle.

It form spores.

Spores are formed after the mitosis.

Growth of meiospores produces the gametophyte.

The cell possess two genomes or two sets of chromosomes.