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.

Ecosystem

Short Answer Type

41.

Sketch the following pyramids.
(i) Pyramid of number (ii) Pyramid of biomass. (iii) Pyramid of energy.

196 Views

42.

Construct a pyramid of biomass, starting with phytoplankton. Label three trophic levels. Is the pyramid upright or inverted? Why?

506 Views

43. Why is the pyramid of energy always upright ?

138 Views

Long Answer Type

44.

Define ecological pyramids and describe with examples, pyramids of number and biomass.

277 Views

One Word Answers

45. By the process of leaching the water soluble inorganic nutrients get precipitated as ?

122 Views

46.

Which nature of humus makes it a good reservoir of nutrients?

145 Views

Short Answer Type

47.

What is a sere?

190 Views

One Word Answers

48.

Most part of energy is lost in which form during the energy flow in the ecosystem?

119 Views

Short Answer Type

49. What are the causes of ecological succession ?

Biotic and physiographic factors operating simultaneously are the causes of ecological succession.

Biotic factors- direct succession and
Physiographic factors include climate and other physical factors such as erosion of hills, filling up of lakes and streams.

183 Views

50. Describe the components of an ecosystem.

146 Views