Home
Class 12
BIOLOGY
In an area where DDT had been used exten...

In an area where DDT had been used extensively the population of birds declined significantly because

A

Birds stopped laying eggs

B

Earthworms disappeared

C

Cobras started feeding on birds

D

Many bird eggs did not hatch.

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • ENVIRONMENTAL ISSUES

    DINESH PUBLICATION ENGLISH|Exercise Check your grasp|18 Videos
  • ENVIRONMENTAL ISSUES

    DINESH PUBLICATION ENGLISH|Exercise Brain teasers-X|145 Videos
  • ECHINODERMATA

    DINESH PUBLICATION ENGLISH|Exercise REVISION QUESTIONS|65 Videos
  • EVIDENCES OF EVOLUTION

    DINESH PUBLICATION ENGLISH|Exercise CHECK YOUR GRASP|19 Videos

Similar Questions

Explore conceptually related problems

How has DDT caused decline in bird population ?

How has DDT caused decline in bird population ?

Cause of decline in population of reptiles and birds is

Discuss why Drosophila has been used extensively for genetical studies?

Biomagnification of DDT caused decline in bird population by:

A crane had DDT level as 5 ppm in its body. What would happen population of such birds ? Explain giving reasons

A lake near a village suffered heavy mortality of fishes within a few days Consider the following reasons for this? (a) Lots of urea and phosphate fertilizers were used in the crops in the vicinity. (b) The area was sprayed with DDT by an aircraft. (c) The lake water turned green and stinky. (d) Phytoplankton population in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main causes of fish mortality in the lake?

A lake near a village suffered heavy mortality of fishes within a few days. Which of the following statements could be the correct explanation for this ? (i) Lots of urea and phosphate fertillisers were used in the crops in the nearby fields. (ii) The croplands of the village were fertillised fields rich in nitrate and phosphate. (iii) The lake water turned green and stinky. (iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.

Escherichia coli is used extensively in biological research, because it is

Plasmid has been used as vector because