Class 10 Science MCQ for Our Environment

1. Which of the following is biodegradable?
(a) Plastic mugs
(b) Leather belts
(c) Silver foil
(d) Iron nails
 
Answer: b
 
 
 
2. Which of the following is non- biodegradable?
(a) Wool
(b) Nylon
(c) Animal bones
(d) Tea leaves
 
 
Answer: b
 
 
 
3. Which one of the following will undergo fastest bio-degradation?
(a) Mango seed
(b) Wood
(c) Mango peel
(d) Mango pulp
 
 
Answer: d
 
 
 
4. An ecosystem is represented in the figure given above. This ecosystem will be self- sustaining if
(a) the type of organisms represented by B are eliminated.
(b) materials cycle between the organisms labelled A and the organisms labelled B.
(c) the organisms labelled A outnumber the organisms labelled B.
(d) the organisms labelled A are equal in number to the organisms labelled B.
 
 
Answer: b
 
 
 
5. In an ecosystem, herbivores represent
(a) producers
(b) primary consumers
(c) secondary consumers
(d) decomposers
 
 
Answer: b
 
 
 
6. Trophic level in an ecosystem represents
(a) oxygen level
(b) water level
(c) energy level
(d) salt level
 
 
Answer: c
 
 
 
7. A food chain comprising birds, green plants, fish and man.
The concentration of harmful chemical entering the food chain will be maximum in
(a) green plants
(b) man
(c) birds
(d) fish
 
 
Answer: b
 
 
 
8. First link in any food chain is usually green plants because
(a) they are widely distributed
(b) they are fixed at one place in the soil
(c) they alone have the capacity to synthesise food using sunlight
(d) there are more herbivores than carnivores
 
 
Answer: c
 
 
 
9. Which of the following statements about food chain and energy flow through ecosystem is false?
(a) Food webs include two or more food chains.
(b) All organisms that are not producers are consumers.
(c) A single organism can feed at several trophic levels.
(d) Detritivores feed at all trophic levels except the producer level.
(e) The lower the trophic level at which an organism feeds, the more energy available.
 
 
Answer: d
 
 
 
10. Which of the following is a logical sequence of food chain
(a) producer → consumer → decomposer
(b) producer → decomposer → consumer
(c) consumer → producer → decomposer
(d) decomposerproducer → consumer
 
 
Answer: a
 
 
 
11. Which of the following is an autotroph?
(a) Lion
(b) Insect
(c) Tree
(d) Mushroom
 
 
Answer: c
 
 
 
12. In the garden ecosystem, which of the following are producers?
(a) Insects
(b) Snakes
(c) Grasses
(d) Rabbits
 
 
Answer: c
 
 
 
13. Which one of the following is an artificial ecosystem? [NCERT Exemplar Problems]
(a) Pond
(b) Crop field
(c) Lake
(d) Forest
 
 
Answer: b
 
 
 
14. An ecosystem includes [NCERT Exemplar Problems]
(a) all living organisms
(b) non-living objects
(c) both living organisms and non-living objects
(d) sometimes living organisms and sometimes nonliving objects
 
 
Answer: c
 
 
 
15. Excessive exposure of humans to UV-ray s results in [NCERT Exemplar Problems]
(i) damage to immune system
(ii) damage to lungs
(iii) skin cancer
(iv) peptic ulcer
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (i) and (iii)
(d) (iii) and (iv)
 
 
Answer: c
 
 
 
16. Which group of organisms are not constituents of a food chain? [NCERT Exemplar Problems]
(a) Grass, lion, rabbit
(b) Plankton, man, fish, grasshopper
(c) Wolf, grass, snake, tiger
(d) Frog, snake, eagle, grass, grasshopper
 
 
Answer: c
 
 
 
17. If a grasshopper is eaten by a frog, then the energy transfer will be from [NCERT Exemplar Problems]
(a) producer to decomposer
(b) producer to primary consumer
(c) primary consumer to secondary consumer
(d) secondary consumer to primary consumer
 
 
Answer: c
 
 
 
18. Excessive exposure to ultraviolet radiation causes
(a) inflammation of liver
(b) cancer of skin
(c) damage to the lungs
(d) jaundice
 
 
Answer: b
 
 
 
19. Which one of the following is an artificial ecosystem?
(a) Lake
(b) Forest
(c) Pond
(d) Crop field
 
 
Answer: d
 
 
 
20. Acid rain is caused by the oxides of
(a) carbon
(b) nitrogen only
(c) sulphur only
(d) sulphur and nitrogen
 
 
Answer: d