Chapter 19 - Environmental Biology - Test 2

Biology Class 10
1. All natural ecosystem are un stable.

1) True   2) False
2. Parasites are those organisms which depend on dead organic matter.

1) True   2) False
3. Consumers that hunt and kill other organisms are called saprophytes.

1) True   2) False
4. Competition which occurs among individuals with in a population is called interaspecific competition.

1) False   2) True
5. The study of inter-relationship of individuals with their environment is known as:

1) Embryology   2) Physiology

3) Ecology   4) Ecosystem
Biology Class 10
6. Water, soil, air, temperature, wind and sunlight are:

1) Biotic factors   2) Ecological pyramids

3) Biomass   4) Abiotic factors
Biology Class 10
7. A group of organisms, similar to one another, which can interbreed in nature and produce fertile offsprings:

1) Species   2) Population

3) Genus   4) Family
Biology Class 10
8. The variety of species in an ecosystem is known as:

1) Communities   2) Biomass

3) Competition   4) Biodiversity
Biology Class 10
9. Consumers which eat both producers and other consumers are called:

1) Parasites   2) Omnivores

3) Herbivores   4) Decomposers
Biology Class 10
10. The recycling of nutrients from the organism back into the environment is done by:

1) Primary consumers   2) Decomposers
3) Secondary consumers   4) Producers
Biology Class 10
11. The thickness of the biosphere is about:

1) 10 Km   2) 20 Km

3) 15 Km   4) 50 Km
Biology Class 10
12. The network of food chains representing the feeding relationships among organisms in an ecosystem is called:

1) Biomass   2) Food web

3) Pyramid   4) Trophic levels
Biology Class 10
13. The percentage of nitrogen in the atmosphere of earth is:

1) 80 %   2) 90 %

3) 78 %   4) 70 %
Biology Class 10
14. The conversion of ammonia to nitrates is known as:

1) Assimilation   2) Denitrification

3) Nitrification   4) Protein synthesis
Biology Class 10
15. Carbondioxide is released during:

1) a. Respiration   2) d. Both A & C

3) c. Decomposition   4) b. Photosynthesis
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