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Flashcards in Energy In Ecosystems- life on earth Deck (32):
0

What is an abiotic factor?

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

1

What is a biotic factor?

A living factors such as habitat, competition and food supply

2

When does competition occur?

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

3

What does the arrows in a food chain indicate?

The direction of energy flow

4

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

A producer

5

What is the source of energy in every food chain?

Sunlight

6

When are food webs said to be balanced?

When they can support a constant number of organisms

7

How do food webs lose their balance?

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

8

What percentage of energy is lost through a food chain?

90%

9

How is energy lost through a good chain?

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

10

What is the pyramid of numbers?

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

11

What is the pyramid of biomass?

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

12

What is the pyramid of energy?

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

13

What is intra specific competition?

Competition between organisms of the same species

14

What is interspecific competition?

Competition between organisms of different species

15

Which type of competition is more intense and why?

Intra specific because they need exactly the same resources

16

If organisms share resources what does this reduce?

Competition

17

Why are nutrient cycles important?

To recycle nutrients so they don't run out

18

Why is nitrogen important?

It is needed to make protein

19

What happens to animals protein when they die?

Decomposers such as bacteria and fungi turn
Protein➡️ammonia

20

What is the ammonia in the soil then converted into?

Nitrifying bacteria turn
Ammonia➡️nitrites➡️nitrates

21

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

Denitrifying bacteria

22

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

Nitrogen fixing bacteria

23

What is a community?

All of the organisms in a given area

24

What is an ecosystem?

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

25

What is a habitat?

Where an organism lives

26

What is a population?

The number of organisms of the same type within a community

27

Why are the producers called the producers?

Because they make their own food

28

What is a consumer?

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

29

What is a carnivore?

A consumer that only eats meat

30

What is a herbivore?

A consumer that only eats plants

31

What is an omnivore?

A consumer that eats both plants and animals