CBSE Class 10 Biology Our Environment MCQs Set H

Question. Which of the following is an example of human made ecosystem?
(a) Aquarium
(b) Sunlight
(c) Wind
(d) Water

Answer: b

Question. Which of the following is not an example of abiotic factors?
(a) Light
(b) Plants
(c) Heat
(d) Temperature

Answer: b

Question. Which of the following is omnivore?
(a) Lion
(b) Hawks
(c) Jackal
(d) Man

Answer: d

Question. Which of the following is a functional unit of environment?
(a) Ecosystem
(b) Nitrogen
(c) Carbon
(d) Oxygen

Answer: a

Question. Which of the following in not an effect of ultraviolet radiations?
(a) Causes skin cancer
(b) Causes sun burn
(c) Causes eye disease
(d) Causes typhoid

Answer: d

Question. Which of the following is an example of herbivores?
(a) Cow
(b) Shark
(c) Lion
(d) Tiger

Answer: a

Question. Which of the following is the full form of CFC?
(a) Chlorofluorine carbon
(b) Carbonchlorofluorine
(c) Chlorinfluid carbon
(d) Chlorofluorocarbon

Answer: d

Question. Which of the following is an example of food chain?
(a) Grass → Deer → Lion
(b) Algae → Diatoms → Fish
(c) Fish → Deer → Algae
(d) Grass → Frog → Birds

Answer: a

Question. Which of the following is the formula of ozone?
(a) O3
(b) O2
(c) O4
(d) O6

Answer: a

Question. It which of the following devices CFC’s are not produced?
(a) Refrigerators
(b) Fire extinguishers
(c) Pressurized cans
(d) Pencil

Answer: d

Question. Which of the following is an example non-biodegradable substance?
(a) Virgin plastic
(b) Plastic
(c) Plants
(d) Plant products

Answer: b

Question. Which of the following constituents do not form ecosystem?
(a) Biotic constituents
(b) Plastic bags
(c) Abiotic constituents
(d) All of these

Answer: b

Question. How many atoms of oxygen are there in ozone?
(a) 3
(b) 4
(c) 2
(d) 1

Answer: b

Question. Which of the following is the full form of UNEP?
(a) United Kingdom of Africa
(b) United State of America
(c) United Nations Environment programme
(d) Union English programme

Answer: c

Question. Which of the following is proper sequence of trophic levels?
(a) Producers, Herbivores, Top carnivores, Carnivores
(b) Top Carnivores, Carnivores, Herbivores, Producers
(c) Carnivores, Top Carnivores, Producers, Herbivores
(d) Herbivores, Carnivores, Producers, Top Carnivores

Answer: b

Question. Which of the following is not a biodegradable pollutant?
(a) Paper
(b) Cotton cloth
(c) Cotton
(d) DDT

Answer: d

Question. What will happen if deer is missing in the given food chain? Grass Deer Tiger
(a) The population of tiger decreases and the population of grass increases
(b) The population of grass decreases
(c) Tiger will start eating grass
(d) The population of tiger increases

Answer: a

Question. Flow of energy in an ecosystem is always-
(a) Unidirectional
(b) Bidirectional
(c) Multidirectional
(d) No specific direction.

Answer: a

Question. Which of the following is terrestrial ecosystem?
(a) A natural forest
(b) A lake
(c) A pond
(d) An aquarium

Answer: a

Question. By which way autotrophs convert energy of food?
(a) Solar energy to chemical energy
(b) Bio-gas to chemical energy
(c) solar energy to bio-gas
(d) Chemical energy to solar energy

Answer: b

Question. Which of the following actions may not affect the environment in worse?
(a) Plastic bags buried inside the earth.
(b) Planting of trees
(c) Excessive use of non-biodegradable pesticides
(d) Burning of plastic bags.

Answer: b

Question. Name the thing in our body which helps us to digest food?
(a) hormone
(b) enzymes
(c) stomach
(d) mouth

Answer: b

Question. Which of the following groups contain only biodegradable items?
(a) Grass, flowers and leather
(b) Grass, wood and plastic
(c) Fruit-peels, cake and lime-juice
(d) Cake, wood and grass

Answer: (a), (c) and (d).

Question. Which human-made material cannot be broken down by the action of bacteria?
(a) human flesh
(b) flesh of dead animal
(c) vegetable peels
(d) plastic

Answer: d

Question. Which of the following is an example of producers?
(a) Plastic pens
(b) Plastic cans
(c) Polythene
(d) Green plants

Answer: d

Question. Which of the following belong to same trophic level?
(a) Cockroach and spider
(b) Lizard and spider
(c) Hawk and spider
(d) Lizard and hawk.

Answer: d

Question. Which of the following constitute a food-chain?
(a) Grass, wheat and mango
(b) Grass, goat and human
(c) Goat, cow and elephant
(d) Grass, fish and goat

Answer: b

Question. Which of the following are environment-friendly practices?
(a) Carrying cloth-bags to put purchases in while shopping
(b) Switching off unnecessary lights and fans
(c) Walking to school instead of getting your mother to drop you on her scooter
(d) All of the above

Answer: d

Question. What is the nature of ozone?
(a) It is deadly poisonous
(b) It is fragrant
(c) It is smooth
(d) It causes purple smoke

Answer: b

Question. Which of the following is an example biodegradable substance?
(a) Glass
(b) Plants
(c) Plastics
(c) Polythene

Answer: b

Question. The percentage of solar radiation absorbed by all the green plants for the Process of photosynthesis is about-
(a) 1%
(b) 8%
(c) 5%
(d) 10%

Answer: a

Question. Which of the following limits the number of trophic levels in a food chain?
(a) Water
(b) Polluted air
(c) Deficient food supply
(d) Decrease in energy at higher trophic levels

Answer: d

Question. In natural ecosystems, decomposers include-
(a) Only bacteria and fungi
(b) Only microscopic animals
(c) Herbivores and carnivores
(d) Both (b) and (c)

Answer: a

Question. ASSERTION (A): Decomposers act as cleaning agents of environment.
REASON(R): The decomposers recycle waste material in hydrosphere.
(a) Both A and R are true and R is the correct explanation for A
(b) Both A and R are true and R is not the correct explanation for A
(c) A is true but R is false
(d) A is false but R is true.

Answer: c

Question. ASSERTION (A):Garden is an artificial ecosystem.
REASON(R): Biotic and abiotic components are manipulated by humAnswer:
(a) Both A and R are true and R is the correct explanation for A
(b) Both A and R are true and R is not the correct explanation for A
(c) A is true but R is false
(d) A is false but R is true.

Answer: b