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Disposable plastic plates should not be used because (a) they are made of materials with lightweight (b) they are made of toxic materials (c) they are made of biodegradable materials (d) they are made of non-biodegradable materials

The answer is (d) they are made of non-biodegradable materials Explanation: Plastics are non-biodegradable hence they start accumulating in nature... View Article

If a grasshopper is eaten by a frog, then the energy transfer will be from (a) producer to decomposer (b) producer to primary consumer (c) primary consumer to secondary consumer (d) secondary consumer to primary consumer

The answer is (c) primary consumer to secondary consumer Explanation: Grasshopper is a primary consumer because it feeds on grass.... View Article

The decomposers in an ecosystem (a) convert inorganic material, to simpler forms (b) convert organic material to inorganic forms (c) convert inorganic materials into organic compounds (d) do not breakdown organic compounds

The answer is (b) convert organic material to inorganic forms Decomposers Decomposers are micro-organisms that digest things that are dead... View Article

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) Tiger will start eating grass (d) The population of tiger decreases and the population of grass increases

The answer is (d) The population of tigers decreases and the population of grass increases. Explanation: Lack of predators will... View Article

In the given Figure the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available? (a) T4 (b) T2 (c) T1 (d) T3

The answer is (c) T1 Maximum energy is available for producers. Only 10% of the energy is consumed by an... View Article

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

The answer is (a) 1 % Explanation: Green plants utilize 1% of the radiation absorbed by leaves and use it... View Article

Which group of organisms are not constituents of a food chain? (i) Grass, lion, rabbit, wolf (ii) Plankton, man, fish, grasshopper (iii) Wolf, grass, snake, tiger (iv) Frog, snake, eagle, grass, grasshopper (a) (i) and (iii) (b) (iii) and (iv) (c) (ii) and (iii) (d) (i) and (iv)

The answer is (c) (ii) and (iii) In option ii) plankton does not eat grass. In option iii) none of... View Article

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

The answer is (b) Green plants get their food from organic compounds Explanation: Green plants produce their food by harnessing... View Article

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

The answer is (a) a Decrease in energy at higher trophic levels Explanation: The available energy level at a particular... View Article

In the following groups of materials, which group (s) contains only non-biodegradable items? (i) Wood, paper, leather (ii) Polythene, detergent, PVC (iii) Plastic, detergent, grass (iv) Plastic, bakelite, DDT (a) (iii) (b) (iv) (c) (i) and (iii) (d) (ii) and (iv)

The answer is (d) (ii) and (iv) Explanation: Group i) has wood and leather which are biodegradable. Group iii) has... View Article

Excessive exposure of humans to U V-rays results in (i) damage to the immune system (ii) damage to lungs (iii) skin cancer (iv) peptic ulcers (a) (i) and (ii) (b) (ii) and (iv) (c) (i) and (iii) (d) (iii) and (iv)

The answer is (c) (i) and (iii) Ultraviolet rays Ultraviolet is one of the electromagnetic radiation which is emitted by... View Article

Flow of energy in an ecosystem is always (a) unidirectional (b) bidirectional (c) multidirectional (d) no specific direction

The answer is (a) unidirectional Explanation: The flow of energy is from prey to predator and it cannot be in... View Article

Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the (a) food web (b) ecological pyramid (c) ecosystem (d) food chain

The answer is (a) food web Food web The Food web is a natural network of food chains. It interconnects... View Article

In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of (a) heat energy (b) light energy (c) chemical energy (d) mechanical energy

The answer is (c) chemical energy The flow of energy at the trophic level Energy is available for transfer from... View Article

Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called (a) decomposers (b) producers (c) herbivores (d) carnivores

The answer is (b) producers Producers Producers use solar energy to synthesize food from water and carbon-di-oxide. Plants and few... View Article

Depletion of ozone is mainly due to (a) chlorofluorocarbon compounds (b) carbon monoxide (c) methane (d) pesticides

The answer is (a) chlorofluorocarbon compounds Chlorofluoro compounds Chlorofluorocarbons (CFC) are gases used for various purposes including solvents, refrigerants and... View Article

Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as (a) eutrophication (b) pollution (c) biomagnification (d) accumulation

The answer is (c) biomagnification Biomagnification Biomagnification can be interpreted as the rise or increase in the contaminated substances caused... View Article

In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level? Grass → Grasshopper → Frog → Snake → Hawk (a) 5 k J (b) 50 k J (c) 500 k J (d) 5000 k J

The answer is (d) 5000 k J Explanation: The available energy level at a particular trophic level is 10 times... View Article

An ecosystem includes (a) all living organisms (b) non-living objects (c) both living organisms and non-living objects (d) sometimes living organisms and sometimes non-living objects

The answer is (c) both living organisms and non-living objects Ecosystem An ecosystem is a complex of living and nonliving... View Article

In a food chain, the third trophic level is always occupied by (a) carnivores (b) herbivores (c) decomposers (d) producers

The answer is (a) carnivores Trophic level In an ecosystem, a group of entities occupying the same level in a... View Article

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