Chapter 22 Questions

Question 0

Compare sperm cells and spores as to the number of chromosomes. What do sperm cells of bryophytes need to complete fertilization? What does this suggest about their ancestry?

Answer 0

Sperm cells and spores are haploid.

Need water.

Their ancestors lived in water.

Question 1

Describe three things that most plants have in common.

Answer 1

1. Have cell wall
2. Hard woodsy tissues
3. Use photosynthesis

Question 2

Describe the functions of xylem and phloem.

Answer 2

Xylum up- carries materials from roots going up.

Phloem down- carries materials from leaves going down.

Question 3

What are three functions of root tissue in plants?

Answer 3

1. Anchor plants
2. Absorb nutrients & water
3. Store food (carrots)

Question 4

What are four functions of stems?

Answer 4

1. Transport water & nutrients
2. Support plant
3. Protection (thorns)
4. Store food (potatoes)

Question 5

Describe what substances woody plants and grasses use to strengthen their cell walls.

Answer 5

Woody plants- have lignin for strength.

Grasses- have silicon dioxide.

Question 6

Explain photosynthesis.

Answer 6

Uses light to make energy and the chlorophyll is the molecule used. Leaf cells include chloroplasts.

Question 7

What is a perfect flower?

Answer 7

A flower with both male and female parts.

Question 8

Describe three ways plants respond to the environment. Can plants communicate with each other? How might they do this?

Answer 8

1. Light
2. Gravity
3. Contact

Yes, by releasing chemicals.