Part B (Pages 11 - 20) Flashcards Preview

WJEC GCSE Biology > Part B (Pages 11 - 20) > Flashcards

Flashcards in Part B (Pages 11 - 20) Deck (26):
1

How do fish die due to fertilizers?

The oxygen is removed from the water via abnormal growth of algae, suffocating the fish.

2

What does Untreated Sewage cause?

Untreated Sewage causes an increase in the growth of water plants. It has the same effect as fertilizers.

3

Give examples of a producer in a food chain.

Leaves, Sun, Plants, etc.

4

What is biomass?

Biomass is the mass of living material in plants and animals.

5

What is the source of all energy?

Light energy from the sun.

6

What is a consumer?

An organism that eats other organisms.

7

How is energy lost from the food chain?

The repair of animal or plant cells.

8

What happens if we eat plants?

The food chain will be shorter, and thus less energy is lost.

9

What factors affect the activity of decomposers?

Temperature, Oxygen, pH and Heavy Metals.

10

Why do animals lose more heat than plants?

Because their metabolism is higher.

11

Why do warm-blooded animals lose more heat than cold-blooded animals?

Because warm-blooded animals need to create a constant temperature.

12

What are the rules for a pyramid of number?

1. The producer is always at the bottom.
2. The size of every block shows the number of animals in the food chain.

13

What are the rules for a pyramid of biomass?

1. The producer is always at the bottom.
2. The size of every block shows the dry mass of the plants or animals in the food chain.

14

What are decomposer?

Decomposers digest and use animal and plant waste for growth and respiration.

15

What do decomposers release?

Decomposers release nitrates into the soils, which plants use for growth.

16

How are organisms represented on a food pyramid?

They are represented as small squares on graph paper.

17

How does Carbon enter the food chain?

Carbon enters the food chain through photosynthesis.

18

How are carbohydrates, fats and proteins passed along the food chain?

They are passed when animals are feeding.

19

What are the human effects on the carbon cycle?

Combustion has increased the concentration of Carbon Dioxide and Sulfur Dioxide in the environment.

20

What do living organisms use to make proteins?

They use nitrogen.

21

How much % of the air is nitrogen?

79% of the air we breathe is nitrogen.

22

Where are chromosomes stored?

Inside the nucleus of a cell.

23

How many pairs of chromosomes do we have?

We have 23 pairs; 22 normal pairs and then the sex chromosomes.

24

How is pair 23 (the sex chromosomes) configured?

Male: XY; Female: XX.

25

What is inside a chromosome?

Genes, which make up amino acids.

26

What are the four types of gene?

A, T, C, and G.