Biotic Factors Affecting Organisms

Question 1

What are biotic factors?

Answer 1

Biotic factors are living factors

Question 2

List some examples of biotic factors.

7

Answer 2

Food

Competition

Predation

Parasitism

Pollination

Seed dispersal

Human intervention

Question 3

What are the two main biotic factors that affect organisms?

Answer 3

Food available

Competition

Question 4

Write a note on how the amount of food available affects organisms
(2)

Answer 4

The more food that is available, the greater the number of organisms that survive

E.g. the number of berries affects the number of blackbirds and the amount of plankton affects the number of mussels

Question 5

Give two examples of where the amount of food available has an affect on organisms.

Answer 5

The number of berries affects the number of blackbirds

The amount of plankton affects the number of mussels

Question 6

Write a note on how competition affects organism

2

Answer 6

Competition means that plants and animals fight for scarce resources such as food, space, mates and shelter

E.g. rabbits compete with each other for food and barnacles and limpets compete for space on rocks

Question 7

Give some examples or resources which organisms may compete for.
(4)

Answer 7

Food

Space

Mates

Shelter

Question 8

Give two examples of competition within a species

Answer 8

Rabbits compete with each other for food

Barnacles and limpets compete for space on rocks