Biology Chapter 9

Question 1

Nastic Response

Answer 1

Plants that respond to touch.

Ex: Venus Flytrap

Question 2

Phototropism

Answer 2

The growth of a plant towards the light. Auxin diffuses to the cells on the shaded side, causing cells there to elongate, causing the stem to bend the plant toward the light.

Question 3

Gravitropism

Answer 3

The growth of a plant in response to gravity.

Positive gravitropism - Roots grow down toward the pull of gravity.

Negative gravitropism - Stems grow away from the pull of gravity.

Question 4

Cohesive Forces

Answer 4

Attractive forces between water molecules.

Question 5

Adhesive Forces

Answer 5

Attractive forces between water molecules and molecules of a surface.

Question 6

Lenticels

Answer 6

Lens-shaped openings that perforate the park of plants such as trees and shrubs.

Question 7

Multicellular organisms can have:

Answer 7

1. A larger size
2. A variety of specialized cells
3. An ability to survive in a wider range of environments