Unit 15: Succession And Populations

Question 1

Index diversity.

Answer 1

Number of species/ number of individuals of each specie

Question 2

A method to collect sample at one site.(3)

Answer 2

1.random sampling
2.place large number of quadrants
3. Count frequency of each specie in quadrant

Question 3

Explain why the sample of fish collected again would not cause a reliable representation of sample.(3)

Answer 3

1.birth/deaths may affect
2.uneven distribution of fish
3.site is too small

Question 4

Advantage of occupying different niches.2

Answer 4

1.less competition for food
2. Both species survive

Question 5

Abiotic factors affecting species diversity.

Answer 5

1. Temp- affect photosynthesis
   2.soil pH -affect enzymes/ denatured proteins
   3.light-linked with photosynthesis

Question 6

Why is there an increase in number of specie X.

Answer 6

1.more variety of food/plants
2.increase in niche
3.increased habitats
4.increases in species richness

Question 7

Estimating the size of a population in a small marsh.(5)

Answer 7

1.random samping
2.use grid to split area in squares
3.generate random coordinates
4.count freq of plant per number of quadrant
5.large sample and calculate mean
6.calculate the No of species per quadrant x No of quadrants

Question 8

How digestion of bacteria provided nutrients.(2)

Answer 8

1. Digest proteins
   2.aminoacid for growth

Question 9

Effect of sterilising males on population.(2)

Answer 9

1. Decrease in reproduction for offspring
2. Less competition for mates

Question 10

Statistical significant difference.(3)

Answer 10

1. X is most statistically significant
2. Y is statistically significant, P is lower than 5% not due to chance alone/ reject null hy
3. Z is not statistically significantly difference

Question 11

Climax community factors.(3)

Answer 11

1. Stable population over a long p
2. Abiotic factors constant
3. Stable community

Question 12

Standard deviation between species .

Answer 12

1. Significant
2. SD do not overlap
   3.same increase in species richness

Question 13

Advantage of SD.

Answer 13

1. How spread data is around mean
2. Reduces anomalies

Question 14

Evidence for succession using an example.(4)

Answer 14

1. Cocci decreased and G. Increased
2. Microorganisms / factor Y changes in abiotic factor “temp” to make environment
3. less hostile for newer species
4. Specie Z outcompetes other species
5. Change in habitats