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Flashcards in module 3 biological diversity Deck (23)
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1

Define ecosystem

A community together with its environment; any environment containing organisms interacting with

2

define biotic

living

3

biotic factors

sources of food, number of predators etc. competition between species or within species,

4

define abiotic

non-living

5

abiotic factors

Climate, light, temperature wind speed sunshine water altitude

6

What does the abiotic and biotic factors determine

The distribution of organisms – where organisms are found in the ecosystem
2. The diversity of organisms – the different type of organisms
3. The abundance of organisms – how many organisms are present

7

explain structural adaptations

things you can see, body shape, anatomical features that assists an organism to adapt to abiotic or biotic environment

8

explain behavioural adaptations

actions that an organism takes to improve survival

9

examples of structural adaptations

e.g. large ears, sunken stomata, flying fish body shape

10

examples of behavioural adaptations

seeking shad or shelter, migration

11

explain physiological adaptations

inner body functions

12

examples of physiological adaptations

e.g. production of concentrated urine, venom, shivering to maintain body temperature, antifreeze in arctic plant

13

who was natural selection discovered by

charles darwin

14

what is natural selection

the process by which the environment selects characteristics that are favourable to a species survival determining if they live or die out

15

what does natural selection rely on

variations in the population --> variations are a result of a random mutation --> resulting in a new characteristic being introduced into a species

16

example of natural selection

peppered moth

17

convergent evolution

The evolution through natural selection of similar features in unrelated groups of organisms

18

example of convergent evolution

dolphin and sharks

19

divergent evolution

Separated populations typically diverge (may be from genetic drift or natural selection) causing separated populations to gradually become different

20

example of divergent evolution

Galapagos finches

21

what is the purpose of selective breeding

to breed livestock to meet specific requirements, especially food

22

why is selective breeding used

• The technique is to identify desirable qualities e.g. good quality meat/ high meat production and breed together individuals with those qualities, so the trait is reliably passed on.

23

example of selective breeding

Belgian blue cowsq