Succession

Question 1

What is a climax community?

Answer 1

A stable community in which no further succession can occur

Question 2

What is the 1st step of succession?

Answer 2

Colonisation by a pioneer species

Question 3

What is the second step of succession

Answer 3

The environment becomes less hostile as hummus is formed

Question 4

What is the 3rd stage of succession

Answer 4

The environment becoming less harsh allows other species to colonize it and compete for resources

Question 5

What is the 4th stage of succession

Answer 5

The species diversity increases

Question 6

What is the 5th stage of succession

Answer 6

Increased stability less hostile environment

Question 7

What do the 6th stage of succession

Answer 7

The formation of a climax community

Question 8

what is a niche?

Answer 8

a species role and position within an ecosystem

Question 9

what are predator prey relationships?

Answer 9

They are cyclic relationships

Question 10

name one reason for cyclic fluctuations in predator prey relationships

Answer 10

diesase, climactic factors

Question 11

what do the crashes in predator prey relationships create

Answer 11

-selection pressures

which are important for evolution

Question 12

why are the selection pressures created by crashes important

Answer 12

as the population evolves to become better adapted to the prevailing conditions

Question 13

what is predation

Answer 13

where one organism the predator eats another the prey

Question 14

what is uniformly distributed

Answer 14

there are the same number of organisms in each region

Question 15

what assumptions are made in proportional sampling and not mark and relase methods

Answer 15

• organsims are uniformly distributed

- size of total area is required

Question 16

give an assumption made in both propotional sampling and mark and release methods

Answer 16

animals are all from the same population

Question 17

give one disadvantage of a line transcet

Answer 17

it may avoid certain areas

Question 18

suggest one reason for habitat conservation

Answer 18

• protects niches

- protects endagerd species

Question 19

Describe how percentage cover could be measured

Answer 19

• count how many squares of the quadrat by the plant
• by counting a square if it’s more than half covered
• the number of squares can be converted into a %

Question 20

what is an ecosystem

Answer 20

all the organisms living in a community

plus all the abiotic conditions in the area in which they live

Question 21

what is population size

Answer 21

total number of organisms of one species in a habitat

Question 22

what is carrying capacity

Answer 22

the maximum stable population size of a species that an ecosystem can support

Question 23

what is a population

Answer 23

all the organisms of one species in a habitat