Energy In Ecosystems- life on earth

Question 0

What is a biotic factor?

Answer 0

A living factors such as habitat, competition and food supply

Question 1

What is an abiotic factor?

Answer 1

This refers to non living factors such as light intensity, water, soil, ph

Question 2

When does competition occur?

Answer 2

It occurs when several different organisms are eating or using the same resource which is in limited supply

Question 3

What does the arrows in a food chain indicate?

Answer 3

The direction of energy flow

Question 4

What is the green plant that starts the food chain called?

Answer 4

A producer

Question 5

What is the source of energy in every food chain?

Answer 5

Sunlight

Question 6

When are food webs said to be balanced?

Answer 6

When they can support a constant number of organisms

Question 7

How do food webs lose their balance?

Answer 7

If organisms disappear from it if they die or catch a disease or move to another area

Question 8

What percentage of energy is lost through a food chain?

Answer 8

90%

Question 9

How is energy lost through a good chain?

Answer 9

As heat energy
In movement
In building bones and hair (not eaten)
Decomposition of dead matter

Question 10

What is the pyramid of numbers?

Answer 10

It represents the number of organisms in a food chain at each feeding level

Question 11

What is the pyramid of biomass?

Answer 11

It represents the populations in a food chain as the total mass of living matter

Question 12

What is the pyramid of energy?

Answer 12

It shows the transfer if chemical energy from the bodies of all the organisms in a food chain over a particular time period

Question 13

What is intra specific competition?

Answer 13

Competition between organisms of the same species

Question 14

What is interspecific competition?

Answer 14

Competition between organisms of different species

Question 15

Which type of competition is more intense and why?

Answer 15

Intra specific because they need exactly the same resources

Question 16

If organisms share resources what does this reduce?

Answer 16

Competition

Question 17

Why are nutrient cycles important?

Answer 17

To recycle nutrients so they don’t run out

Question 18

Why is nitrogen important?

Answer 18

It is needed to make protein

Question 19

What happens to animals protein when they die?

Answer 19

Decomposers such as bacteria and fungi turn

Protein➡️ammonia

Question 20

What is the ammonia in the soil then converted into?

Answer 20

Nitrifying bacteria turn

Ammonia➡️nitrites➡️nitrates

Question 21

Some nitrates are converted into nitrogen gas by which type of organism?

Answer 21

Denitrifying bacteria

Question 22

Some nitrogen gas is then converted back into nitrates by which organism living in the soil?

Answer 22

Nitrogen fixing bacteria

Question 23

What is a community?

Answer 23

All of the organisms in a given area

Question 24

What is an ecosystem?

Answer 24

This is a natural biotic unit made up of abiotic and biotic factors

Question 25

What is a habitat?

Answer 25

Where an organism lives

Question 26

What is a population?

Answer 26

The number of organisms of the same type within a community

Question 27

Why are the producers called the producers?

Answer 27

Because they make their own food

Question 28

What is a consumer?

Answer 28

Animals that can’t produce their own food so eat food for energy are called consumers

Question 29

What is a carnivore?

Answer 29

A consumer that only eats meat

Question 30

What is a herbivore?

Answer 30

A consumer that only eats plants

Question 31

What is an omnivore?

Answer 31

A consumer that eats both plants and animals