Assignment 11

Question 1

Ludwig’s ratchet predicts
a. decreasing harvesting rate
b. constant harvesting rate
c. increasing harvesting rate
d. fluctuating harvesting rate

Answer 1

increasing harvesting rate

Question 2

Which of these is correct?
a. R + G = M + F
b. R + M = G + F
c. R + F = M + G
d. R + G + M + F = 0

Answer 2

R + G = M + F

Question 3

A deciduous forest in Madhya Pradesh was converted to a mine. After the mining operations were over, the pits were
filled up with soil and species of deciduous forest planted again. This is an example of
a. recovery
b. restoration
c. enhancement
d. replacement

Answer 3

restoration

Question 4

A deciduous forest in Madhya Pradesh was converted to a mine. After the mining operations were over, the pits were
filled up with water and a lake was created. It is now visited by several migratory birds. This is an example of
a. recovery
b. restoration
c. enhancement
d. replacement

Answer 4

replacement

Question 5

A root zone treatment plant is an example of
a. phytoremediation
b. biological control
c. biomagnification
d. bioaccumulation

Answer 5

phytoremediation

Question 6

A pest population is called controlled when
a. it is not increasing
b. it is decreasing
c. it is not causing any economic damage
d. it is not causing excessive economic damage

Answer 6

it is not causing excessive economic damage

Question 7

Which of these is not an impact of toxic chemicals?
a. lethal effects
b. sub-lethal effects
c. reduction of existing stressors
d. reduced fecundity

Answer 7

reduction of existing stressors

Question 8

Which of these is correct?
a. The maximum sustainable yield is near the beginning of the sigmoidal curve.
b. The maximum sustainable yield is near the mid-point of the sigmoidal curve.
c. The maximum sustainable yield is near the end of the sigmoidal curve.
d. None of these.

Answer 8

The maximum sustainable yield is near the mid-point of the sigmoidal curve.

Question 9

The impact of El Nino on fishery collapse in Peru is explained by
a. match hypothesis
b. mismatch hypothesis
c. match-mismatch hypothesis
d. none of these

Answer 9

match-mismatch hypothesis

Question 10

A pest population is called uncontrolled when
a. it is increasing
b. it is not decreasing
c. it is causing some economic damage
d. it is causing excessive economic damage

Answer 10

it is causing excessive economic damage