Our Environment

Which one of the following is an artificial ecosystem?
1. Pond
2. Crop field
3. Lake
4. Forest
In a food chain, the third trophic level is always occupied by
1. carnivores
2. herbivores
3. decomposers
4. producers
An ecosystem includes
1. all living organisms
2. non-living objects
3. both living organisms and non-living objects
4. sometimes living organisms and sometimes non-living objects
In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level?

Grass → Grasshopper → Frog → Snake → Hawk
1. 5 k J
2. 50 k J
3. 500 k J
4. 5000 k J
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
1. eutrophication
2. pollution
3. biomagnification
4. accumulation
Depletion of ozone is mainly due to
1. chlorofluorocarbon compounds
2. carbon monoxide
3. methane
4. pesticides
Which of the following is biodegradable?
1. Plastic mugs
2. Leather belts
3. Silver foil
4. Iron nails
Which one of the following will undergo fastest bio-degradation?
1. Mango seed
2. Wood
3. Mango peel
4. Mango pulp
Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
1. decomposers
2. producers
3. herbivores
4. carnivores
In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of
1. heat energy
2. light energy
3. chemical energy
4. mechanical energy
Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the
1. food web
2. ecological pyramid
3. ecosystem
4. food chain
Flow of energy in an ecosystem is always
1. unidirectional
2. bidirectional
3. multi directional
4. no specific direction
Excessive exposure of humans to U V-rays results in
(i) damage to immune system
(ii) damage to lungs
(iii) skin cancer
(iv) peptic ulcers
1. (i) and (ii)
2. (ii) and (iv)
3. (i) and (iii)
4. (iii) and (iv)
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
1. iii
2. iv
3. (i) and (iii)
4. (ii) and (iv)
Which of the following limits the number of trophic levels in a food chain?
1. Decrease in energy at higher trophic levels
2. Sufficient food supply
3. Polluted air
4. Water
Which of the statement is incorrect?
1. All green plants and blue green algae are producers
2. Green plants get their food from organic compounds
3. Producers prepare their own food from inorganic compounds
4. Plants convert solar energy into chemical energy
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
1. (i) and (iii)
2. (iii) and (iv)
3. (ii) and (iii)
4. (i) and (iv)
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about
1. 1%
2. 5%
3. 8%
4. 10%
What will happen if deer is missing in the food chain given below? Grass → Deer → Tiger
1. The population of tiger increases
2. The population of grass decreases
3. Tiger will start eating grass
4. The population of tiger decreases and the population of grass increases
The decomposers in an ecosystem
1. convert inorganic material, to simpler forms
2. convert organic material to inorganic forms
3. convert inorganic materials into organic compounds
4. do not breakdown organic compounds

Our Environment

Quiz