Year 8 Biology Unit 1

Question 1

What is the movement of water through a plant called?

Answer 1

Transpiration

Question 2

What is the formula for photosynthesis?

Answer 2

carbon dioxide + water = glucose + oxygen

Question 3

Describe a food chain

Answer 3

sun - producer - consumer -

Question 4

Organisms rely on each other for food and energy. What is this called?

Answer 4

Interdependence

Question 5

What causes extinction?

Answer 5

-changes to climate/ environment
-new diseases
-new competition for food and space
-poaching
-new predators
-damage to the food chain

Question 6

Describe biodiversity

Answer 6

a range of different plants and animals living in an eco system

Question 7

How do plants use glucose?

Answer 7

-dissolves into starch & is stored
-turns into cellulose to make cell walls
-makes proteins
-used for respiration in the mitochondria to release energy

Question 8

What is tropism in plants?

Answer 8

a growth reaction in relation to stimulus such as gravity, water, light etc

Question 9

Why is photosynthesis necessary for plants?

Answer 9

provides energy

Question 10

What is phototropism?

Answer 10

Phototropism is controlled by a plant hormone called auxin.

Question 11

What factors limit how quickly a plant photosynthesises?

Answer 11

light intensity
temperature
carbon dioxide

Question 12

What part of the plant does water and nutrients travel through?

Answer 12

Xylem

Question 13

What happens when there isn’t enough water to push against the cell wall of a plant?

Answer 13

Wilting.

Question 14

What does germination mean?

Answer 14

the development of a plant from a seed

Question 15

How are seeds dispersed?

Answer 15

-wind
-animals
-gravity
-water
-ballistic