Populations

Question 1

Habitat

Answer 1

The place where an organism lives.

Question 2

Population

Answer 2

All the organisms of one species in a habitat.

Question 3

Community

Answer 3

Populations of different species in a habitat make up a community.

Question 4

Ecosystems

Answer 4

All the organisms living in a particular area and all the non living conditions.

Question 5

Abiotic conditions

Answer 5

The non living features of the ecosystem. Eg. Temp and availability of water

Question 6

Biotic conditions

Answer 6

The living features of the ecosystem. Eg. Presence of predators or food.

Question 7

Niche

Answer 7

The role of a species within its habitat

Question 8

Adaptation

Answer 8

A feature that members of a species have that increases their chance of survival and reproduction.

Question 9

What is involved when investigating populations?

Answer 9

The abundance and distribution of a species in a particular area.

Question 10

Abundance

Answer 10

The number of individuals of one species in a particular area.

Question 11

Frequency

Answer 11

The number of samples a species is recorded in

Question 12

Percentage cover

Answer 12

For plants only. How much of the area your investigating is covered by a species.

Question 13

Distribution

Answer 13

Where a particular species is within the area you’re investigating.

Question 14

Why are samples of populations taken?

Answer 14

It would be too time consuming to measure the number of individuals and the distribution of every species in the entire area you’re investigating so instead you take samples.

Question 15

Describe how a student could investigate the percentage cover of daffodils in a field. 4 marks

Answer 15

She could use quadrats to measure the percentage cover of daffodils.
Several would be placed on the ground at random locations within the field.
The percentage of each quadrat thats covered by daffodils wpuld be recorded.
The percentage cover for the whole field could then be estimated by averaging the data collected in all of the quadrats.

Question 16

Describe the mark-release-recapture method. 5marks

Answer 16

A group of snails would have been caught.
Marked in a way that wouldn’t harm them.
Then released back into the environment.
After a week a second sample would be taken.
The number marked in the second sample would have been counted.

Question 17

Population size

Answer 17

The total number of organisms of one species in a habitat.

Question 18

Interspecific competition

Answer 18

Competition between different species.

Question 19

Intraspecific competition

Answer 19

Competition within a species for the same resources.

Question 20

Predation

Answer 20

Where an organism kills and eats another organism.

Question 21

How to calculate human population growth?

Answer 21

Calculated using birth and death rates.

Question 22

Birth rate

Answer 22

The number of live births each year for every 1000 people in a population.

Question 23

Death rate

Answer 23

The number of people that die each year for every 1000 people in the population.

Question 24

Population growth rate

Answer 24

How much the population size increases or decreases in a year. Using birth and death rates.

Question 25

Survival curves show

Answer 25

The percentage of all the individuals that were born in a population that are still alive at any given age.