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Flashcards in Biology 1b Deck (47)
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True or False - animals in the desert have a large surface area to volume ratio

True

1

How has a polar bear evolved to stay warm ?

Thick layer if blubber for insulation

2

What is another benefit of blubber ?

Acts as an energy store when food is scarce

3

How has the arctic fox evolved to avoid predators ?

Light fur to blend in with snow

4

Why do cacti have spines rather than leaves ?

•Plants lose water vapour from the surface of the leaves. Spines have a smaller surface area so less water is lost
•They deter predators as they are sharp

5

give two ways wasps deter predators

•Stinger
•Sting contains poisons
•Yellow and black coat signifies danger

6

What is an extremophile ?

A microorganism that can live in very extreme environments, like volcanic vents

7

What do plants compete for ?

Light
Space
Water
Minerals from soil

8

What do animals compete for ?

Space (territory)
Food
Water
Mates to reproduce with

9

What is a living factor ?

Disease
Predators
Prey or food sources
Competitors

10

What is a non-living factor ?

Temperature
Rainfall
Pollution - air or water

11

What is a living indicator of air pollution ?

Lichen

12

What is lichen an how does it show pollution ?

They are a moss like plant that grow on tree bark. Different species grow in different areas depending on the sulphur dioxide in the atmosphere.

13

What is a pollution indicator of water pollution ?

Mayfly lavae

14

How does mayfly larvae indicate water pollution ?

They are very sensitive to the concentration of dissolved oxygen in water - left by sewage. If you see mayfly larvae the water is clean

15

What is an example of a non-living indicator of environmental change ? How does it measure this ?

Satellites, it can measure snow and ice cover and sea temperature

16

What does a pyramid of biomass show ?

The mass of living material on each tropic level of a food chain

17

What is a tropic level ?

It is the word given for the different stages of the food chain

18

What is a producer ?

A plant

19

The energy gradually decreases as you go up a tropic level. Why does this happen ?

Each tropic level uses some of the energy for movement ( any of the 7 life processes )

20

What are the perfect conditions for microorganisms ?

Moist, warm conditions

21

How do you make the most of a compost bin ?

Finely shredded waste
Air holes

22

How is carbon dioxide released into the atmosphere ?

•Burning fossil fuels
•Plant/animal respiration
•CO2 released from decay

23

How is carbon dioxide removed from the atmosphere ?

Mainly photosynthesis
Some dissolves in sea

24

What is genetic variation ?

Your characteristic differences to others that is down to your genetic information

25

What is environmental variety ?

When you are different because of the environment. Like dying your hair or losing a limb

26

What is the nucleus ?

The part of a cell which holds your genetic material in chromosomes

27

What is a chromosome ?

Coils of DNA

28

What is DNA ?

DNA is the genetic material of humans, found in the nucleus of cells

29

What is sexual reproduction ?

It involves the fusion of male and female gametes. There are two parents so the offspring will contain a mixture of their parents' genes