Plant responses to changes in the environment

Question 1

What is a stimuli

Answer 1

A detectable change in the external or internal environment of an organism that leads to a response from the organism

Question 2

What are external stimuli

Answer 2

Anything outside organisms body (sunlight)

Question 3

What are internal stimuli

Answer 3

Anything inside the body (hunger)

Question 4

What does changing according to stimuli benefit

Answer 4

Allows organisms to avoid harmful external changes whilst also maintaining an optimal internal environment for metabolic reactions

Question 5

How do plants respond to environmental changes

Answer 5

By producing chemicals or altering their growth

Question 6

Define tropism

Answer 6

A tropism is a directional growth response in which the direction of the response is determined by the direction of the external stimulus

Question 7

Define phototropism

Answer 7

When part of a plant grows in a particular direction in response to a light stimulus

Question 8

Define geotropism

Answer 8

Part of a plant grows in a particular direction in response to the force of gravity

Question 9

What is it called if a plant responds towards a stimulus

Answer 9

Positive trophic response

Question 10

What is it called if a plant responds away from a stimulus

Answer 10

Negative trophic response

Question 11

Describe gravity effect of roots

Answer 11

Positive geotropism

Question 12

Describe effect of light on plant shoots

Answer 12

Positive phototropism

Question 13

What is a chemotropism

Answer 13

When part of a plant grows in response to the location of chemicals

Question 14

What is it called when a plant response is non-directional

Answer 14

Nastic response

Question 15

How are plant responses controlled

Answer 15

Plant hormones as they don’t have a central nervous system

Question 16

What are plant hormones called

Answer 16

Plant growth factors