Our Environment NCERT Exemplar Problem
MCQs Part 2
Question 11: Excessive exposure of humans to UV rays results in
- Damage to immune system
- Damage to lungs
- Skin cancer
- Peptic ulcers
- (i) and (ii)
- (ii) and (iv)
- (i) and (iii)
- (iii) and (iv)
Answer: (c) (i) and (iii)
Question 12: In the following groups of materials, which group (s) contains only non-biodegradable items?
- Wood, paper, leather
- Polythene, detergent, PVC
- Plastic, detergent, grass
- Plastic, bakelite, DDT
- (iii)
- (iv)
- (i) and (iii)
- (ii) and (iv)
Answer: (d) (ii) and (iv)
Question 13: Which of the following limits the number of trophic levels in a food chain?
- Decrease in energy at higher trophic levels
- Defficient food supply
- Polluted air
- Water
Answer: (a) Decrease in energy at higher trophic levels
Question 14: Which of the statement is incorrect?
- All green plants and blue green algae are producers
- Green plants get their food from organic compounds
- Producers prepare their own food from inorganic compounds
- Plants convert solar energy into chemical energy
Answer: (b) Green plants get their food from organic compounds
Question 15: Which group of organisms are not constituents of a food chain?
- Grass, lion, rabbit, wolf
- Plankton, man, fish, grasshopper
- Wolf, grass, snake, tiger
- Frog, snake, eagle, grass, grasshopper
- (i) and (iii)
- (iii) and (iv)
- (ii) and (iii)
- (i) and (iv)
Answer: (c) (ii) and (iii)
Question 17: The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about
- 1%
- 5%
- 8%
- 10%
Answer: (a) 1%
Question 18: Assume T1, T2, T3 and T4 are the various trophic levels from bottom to top in a pyramid. At which trophic level is maximum energy available?
- T4
- T2
- T1
- T3
Answer: (c) T1
Question 18: What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
- The population of tiger increases
- The population of grass decreases
- Tiger will start eating grass
- The population of tiger decreases and the population of grass increases
Answer: (d) The population of tiger decreases and the population of grass increases
Question 19: The decomposers in an ecosystem
- Convert inorganic material, to simpler forms
- Convert organic material to inorganic forms
- Convert inorganic materials into organic compounds
- Do not breakdown organic compounds
Answer: (b) Convert organic materials to inorganic forms
Question 20: If a grass hopper is eaten by a frog, then the energy transfer will be from
- Producer to decomposer
- Producer to primary consumer
- Primary consumer to secondary consumer
- Secondary consumer to primary consumer
Answer: (c) Primary consumer to secondary consumer
Question 21: Disposable plastic plates should not be used because
- They are made of materials with light weight
- They are made of toxic materials
- They are made of biodegradable materials
- They are made of non-biodegradable materials
Answer: (d) They are made of non-biodegradable materials