Solutions-Class-12-Biology-Chapter-14-Ecosystems and Energy Flow-Maharashtra Board

Ecosystems and Energy Flow

Maharashtra Board-Class-12th-Biology-Chapter-14

Solutions

Question 1. Multiple choice questions

(1) Which one of the following has the largest population in a food chain?

(a) Producers

(b) Primary consumers

(c) Secondary consumers

(d) Decomposers

Answer :

(2) The second trophic level in a lake is ________________

(a) Phytoplankton

(b) Zooplankton

(c) Benthos

(d) Fishes

Answer :

(3) Secondary consumers are __________

(a) Herbivores

(b) Producers

(c) Carnivores

(d) Autotrophs

Answer :

(4) What is the % of photosynthetically active radiation in the incident solar radiation?

(a) 100%

(b) 50 %

(c) 1-5%

(d) 2-10%

Answer :

(6) Give the term used to express a community in its final stage of succession?

(a) End community

(b) Final community

(c) Climax community

(d) Dark community

Answer :

(7) After landslide which of the following type of succession occurs?

(a) Primary

(b) Secondary

(c) Tertiary

(d) Climax

Answer :

(8) Which of the following is most often a limiting factor of the primary productivity in any ecosystem.

(a) Carbon

(b) Nitrogen

(c) Phosphorus

(d) Sulphur

Answer :

Question 2. Very short answer question.

(1) Give an example of ecosystem which shows inverted pyramid of numbers.

Answer :

(2) Give an example of ecosystem which shows inverted pyramid of biomass.

Answer :

(3) Which mineral acts as limiting factor for productivity in an aquatic ecosystem.

Answer :

(4) Name the reservoir and sink of carbon in carbon cycle.

Answer :

Question 3. Short answer questions.

(1) Distinguish between upright and inverted pyramid of biomass

Answer :

(2) Distinguish between Food chain and Food web.

Answer :

Question 4. Long answer questions.

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

Answer :

(2) What is primary productivity? Give brief description of factors that affect primary productivity.

Answer :

(3) Define decomposition and describe the processes and products of decomposition.

Answer :

(4) Write important features of a sedimentary cycle in an ecosystem.

Answer :

(5) Describe carbon cycle and add a note on the impact of human activities on carbon cycle.

Answer :

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