Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

 Multiple Choice QuestionsMultiple Choice Questions


Assertion : In a food chain members of successive higher levels are fewer in number.

Reason : Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

  • If both Assertion and Reason are true and the reason is the correct explanation of the assertion

  • If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

  • If Assertion is true statement but Reason is false

  • If both Assertion and Reason are false statements


Biological Oxygen Demand (BOD) is a measure of

  • industrial wastes poured into water bodies

  • extent to which water is polluted with organic compounds

  • amount of carbon monoxide inseparably combined with haemoglobin

  • amount of oxygen needed by green plants during night


When a natural predator (living being) is applied on the other pathogen organism to control them, this process is called

  • biological control

  • genetic engineering

  • artificial control

  • confusion technique


The food chain starts from :

  • consumer

  • producer

  • decomposer

  • nitrogen fixation


Enzyme and carbohydrates dominate in the digestive tract of

  • carnivores

  • omnivores

  • parasites

  • herbivores


The 10% energy transfer law of food chain was given by

  • Stanley

  • Weismann

  • Lindemann

  • Tansley


The term 'ecosystem' was coined by :

  • E.P. Odum

  • A.G. Tansley

  • Carl Mobious

  • W. Clementus


As insecticides reach at higher trophic level in food chain their concentration :

  • increases

  • become irregular

  • remain constant

  • decreases


Some students, during a study, caught, marked and released 80 fishes in a pond. Later 100 fishes were caught at random. Among these 40 were found to be marked. What is the approximate number of fishes in the pond?

  • 50

  • 100

  • 200

  • 4000


July 11 is observed as:

  • World population day

  • No tobacco day

  • World environment day

  • World health day