LESSON 1:Homeostasis and the characteristics of plants

Question 1

What is homeostasis?

Answer 1

A dynamic process in which physiological changes are made in response to external changes in the environment

Question 2

What are the six characteristics of plants?

Answer 2

1) cell wall of cellulose
2) multicellular
3) chlorophyll a + b for photosynthesis
4) sessile
5) alternation of generations (gametophyte + sporophyte)
6) embryophyte (early sporophyte contained within gamete)

Question 3

What do most plants produce as a photosynthetic pigment used in photosynthesis?

Answer 3

Chlorophyll

Question 4

Where does the haploid phase of the plant life cycle begins?

Answer 4

In specialized cells of the sporophyte, where haploid spores are produced by meiosis.

Question 5

What are spores?

Answer 5

Single haploid cells with fairly thick cell walls.

Question 6

What happens when a spore germinates?

Answer 6

It divides by mitosis to produce a multicellular haploid gametophyte.

Question 7

What is special about the embryo of land plants?

Answer 7

The embryo (new sporophyte generation) is retained inside the gametophyte tissue.