UNIT 3: (3.4) Energy in ecosystems

Question 1

how much energy is lost from a food chain or web?

Answer 1

90%

Question 2

how much energy in a food chain or web is used for growth?

Answer 2

10%

Question 3

what is energy used for?

Answer 3

• movement
• chemical reactions
• maintenance of body temperature
• growth and repair of tissue

Question 4

what is a food chain?

Answer 4

is a diagram that shows the feeding relationships between different living things in a particular environment

Question 5

how is energy lost in a food chain or web?

Answer 5

• some energy is converted to heat
• some energy is used for movement
• some energy remains in undigested material e.g bones

Question 6

what is a food web?

Answer 6

a number of food chains joined together

Question 7

what is a pyramid of numbers?

Answer 7

is a diagram which shows the relative total number of organisms present at each stage in the food chain

Question 8

what is a pyramid of energy?

Answer 8

is a diagram which shows the total energy of organisms present at each stage in the food chain

Question 9

what is a niche?

Answer 9

is the role occupied by an organism within a community

Question 10

what is inter specific competition?

Answer 10

occurs when organism of different species compete for one or few of the resources they require

Question 11

what is intra specific competition?

Answer 11

occurs between organisms of the same species and is for all the resources they require

Question 12

what type of competition is more i n t e n s e?

Answer 12

intraspecific competition