study of an ecosystem

Question 1

suggest one advantage of carrying out animal population surveys

Answer 1

monitor changes

Question 2

describe the steps taken to estimate the population of a named animal species in the ecosystem you have studied

Answer 2

rabbits - capture recapture method
-capture a number of rabbits and mark them
-free them in the same areas captured
-capture the number of rabbits and count the number marked
- c1 x c2 divide m2

Question 3

state one reason why ecological surveying is important

Answer 3

conservation

Question 4

name the ecosystem you have studied

Answer 4

woodland/grassland

Question 5

draw a food chain from this named ecosystem containing four members

Answer 5

grass-grasshopper-bird-hawk

Question 6

why are food chains mostly limited to four or five members

Answer 6

large energy loss

Question 7

give one limitation of the use of pyramids of numbers

Answer 7

difficult to draw to scale

Question 8

explain the term quantitative

Answer 8

number of organisms

Question 9

explain the term qualitative

Answer 9

presence or absence of organisms

Question 10

name the ecosystem you have studied and describe how you conducted a quantitative survey of flora present in it

Answer 10

woodland/grassland-we threw a pencil behind us and place the waudrat on top of where the pencil landed, we repeat this 10 times to get the average

Question 11

how did you present there results of your survey

Answer 11

table

Question 12

suggest a possible source of error in your survey

Answer 12

miscounting

Question 13

name a plant from the ecosystem you have studied and indicate two abiotic factors condition which favour its presence

Answer 13

grass - soil pH, soil temperature

Question 14

how did you measure any one of the abiotic conditions mentioned

Answer 14

soil pH - pH meter

Question 15

suggest how an error might be minimised or eliminated

Answer 15

count multiple times

Question 16

give an example of a safety hazard

Answer 16

wet grass

Question 17

explain how you carried out - collection of fauna using a named method

Answer 17

beating tray - we shook many varies of small trees while holding it under the collect small organsims and leaves

Question 18

explain how you carried out - identification of the collected fauna

Answer 18

photographs

Question 19

why is it essential to use a random sampling technique

Answer 19

to prevent bias

Question 20

suggest two abiotic factors that could affect the distribution of the named plant species

Answer 20

pH, temperature

Question 21

state one was in which human activity can have an impact on you named ecosystem

Answer 21

pollution