Chapter 15
Our Environment
MCQs
Q 1.: In a food chain, the third tropic level is always occupied by
(A) Carnivores
(B) Herbivores
(C) Decomposers
(D) Producers
Option – A
Q 2.: An ecosystem includes
(A) All living organisms
(B) Nonliving organisms
(C) Both living and nonliving factors of environment
(D) Sometimes living organisms and nonliving organisms
Option – C
Q 3.: This is an artificial ecosystem
(A) Pond
(B) Crop field
(C) Lake
(D) Forest
Option – B
Q 4.: The second trophic level is always of
(A) Herbivores
(B) Autotrophes
(C) Carnivores
(D) Producers
Option – A
Q 5.: Trophic levels are formed by
(A) organisms linked in food chain
(B) Only plants
(C) Only animals
(D) Only carnivores
Option – A
Q 6.: An agriculture/cropland is
(A) A biome
(B) Natural ecosystem
(C) An artificial ecosystem
(D) a community of plants and animals only
Option – C
Q 7.: In natural ecosystem decomposers include
(A) Only microscopic animals
(B) Only bacteria and fungi
(C) Herbivores and carnivores
(D) Both (a) and (b)
Option – D
Q 8.: These are present at maximum number in ecosystem.
(A) Producers
(B) Consumers of first level
(C) Carnivores
(D) Omnivorous
Option – A
Q 9.: Energy flow from one tropic level to another in an ecosystem is
(A) 5%
(B) 10%
(C) 15%
(D) 20%
Option – B
Q 10.: Increasing accumulation of DDT in higher trophic level of a food chain is
(A) Biotic potential
(B) Biotic influence
(C) Biomagnification
(D) Bioconcentration
Option – C
Q 11.: This is biodegradable.
(A) DDT
(B) Cow dung
(C) Polythene
(D) Plastic
Option – B
Q 12.: Driving force of an ecosystem is.
(A) Carbohydrates
(B) Biomass
(C) ATP
(D) Solar energy
Option – D
Q 13.: In a food chain, energy flow is.
(A) Unidirectional
(B) Bidirectional
(C) Multidirectional
(D) No definite pattern
Option – A
Q 14.: A pond ecosystem is.
(A) Natural
(B) Hydrological
(C) Artificial
(D) Abiotic
Option – A
Q 15.: This limits the number of trophic levels in a food chain
(A) Decrease in energy at higher trophic level
(B) Deficient food supply
(C) Polluted air
(D) Water
Option – A
Q 16.: Which of the statement is incorrect?
(A) All green plants and blue-green algae are producers
(B) Green plants get their food from organic compounds
(C) Producers prepare their own food from inorganic compounds
(D) Plants convert solar energy into chemical energy
Option – B
Q 17.: Depletion of ozone layer is mainly due to
(A) Chlorofluorocarbon compounds
(B) Pollution
(C) Methane
(D) Pesticides
Option – A
Q 18.: What will happen if deer is missing in the food chain given below?
Grass →Deer→Tiger
(A) The population of tiger increases.
(B) The population of grass decreases.
(C) They will start eating grass.
(D) The population of tiger decreases and the population of grass increases.
Option – D
Q 19.: The decomposers in an ecosystem
(A) Convert inorganic material into simpler forms
(B) Convert organic materials into inorganic forms
(C) Do not breakdown organic compounds
(D) Convert inorganic materials into organic compounds
Option – B
Q 20.: If a grasshopper is eaten by a frog, then the energy transfer will be from
(A) Producers to decomposers
(B) Producers to primary consumer
(C) Primary consumer to secondary consumer
(D) Secondary consumer to primary consumer
Option – C
Q 21.: The decomposers in an ecosystem:
(A) Convert organic material to inorganic forms
(B) Convert inorganic material to simpler forms
(C) Convert inorganic material into organic compound
(D) Do not break down organic compound
Option – A
Q 22.: Some waste products are listed below:
- Grass Cutting
- Polythene Bag
- Plastic Toys
- Used Tea Bags
- Old Clothes
- Paper Straw
Which group of waste materials can be classified as non-biodegradable?
(A) Plant waste, used tea bags
(B) Polyethene bags, plastic toys
(C) Used tea bags, paper straw
(D) Old clothes, broken footwear
Option – B
Q 23.: Which statement shows interaction of an abiotic component with a biotic component in an ecosystem?
(A) A grasshopper feeding on a leaf.
(B) Rainwater running down into the lake.
(C) An earthworm making a burrow in the soil.
(D) A mouse fighting with another mouse for food.
Option – C
Q 24.: Which of the following are environment-friendly practices?
(A) Carrying a cloth-bag 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.
Option – D
Q 25.: The amount of energy that flows from one trophic level to another in a food chain is
(A) 5%
(B) 10%
(C) 20%
(D) 15%
Option – B
Q 26.: The manufacturing of Chlorofluorocarbons free refrigerators is mandatory throughout the world. How does this help prevent ozone depletion?
(A) This will help convert oxygen molecules into ozone.
(B) This will help convert the CFCs into ozone molecules.
(C) This will reduce the production of CFC from oxygen molecules.
(D) This will reduce the release of CFCs that reacts with ozone molecules
Option – D
Q 27.: Kitchen wastes can be hygienically disposed off through
(A) Landfilling
(B) Composting
(C) Incineration
(D) Both ‘A’ and ‘B’
Option – D
Q 28.: Environment includes
(A) Land, air, water
(B) Light, temperature, rainfall
(C) Plants, animals, microbes
(D) All of these
Option – D
Q 29.: Which of the following is a linear arrangement of organisms
(A) Food chain
(B) Food Web
(C) Both ‘A’ and ‘B’
(D) Community
Option – A
Q 30.: An agricultural cropland is
(A) A biome
(B) A natural ecosystem
(C) An artificial ecosystem
(D) None of these
Option – C
Q 31.: Problem of solid waste disposal can be reduced through…….
(A) Recycling
(B) Lesser pollution
(C) More timber
(D) Population control
Option – A
Q 32.: An environment friendly practice is
(A) Using CFLs at homes and offices
(B) Using car to go to nearby places
(C) Using AC in every room
(D) Burning plastics
Option – A
Q 33.: Which of the following is nature’s cleaner?
(A) Producers
(B) Consumers
(C) Decomposers
(D) Symbionts
Option – C
Q 34.: Ozone hole may cause
(A) Mutations
(B) Global warming
(C) Skin cancer
(D) All of these
Option – D
Q 35.: The harmful chemical which is accumulating in human beings through food chain is
(A) BHC
(B) DDT
(C) Abscisic acid
(D) CFC
Option – B
Q 36.: Biodegradable wastes include
(A) Aluminium foils
(B) Glass bottles
(C) Pesticides
(D) Wood shavings
Option – D
Q 37.: What is the most expensive component of solid waste handling?
(A) Collection
(B) Storage
(C) Treatment
(D) Separation
Option – A
Q 38.: Which of the following statement regarding recycling is wrong?
(A) Saves precious resources
(B) Require stable market
(C) Improves efficiency of treatment processes
(D) Increases the needs for mining virgin materials
Option – D
Q 39.: In a given food chain the amount of energy at fourth trophic level is 5 kJ, what will be the energy at producer level ?
(A) 5 kJ
(B) 50 kJ
(C) 500 kJ
(D) 5000 kJ
Option – D
Q 40.: Acid rain is caused due to _______.
(A) Carbon dioxide
(B) Nitrogen oxides
(C) Sulphur oxides
(D) Both (b) and (c)
Option – D