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Class X-Our Environment-Vasu Classes
1.
Which one of the following is an artificial ecosystem?
a) Pond
b) Crop field
c) Lake
d) Forest
2.
In a food chain, the third trophic level is always occupied by
a) carnivores
b) herbivores
c) omnivores
d) producers
3.
An ecosystem includes
a) all living organisms
b) non-living objects
c) both living organisms and non-living objects
d) both living organisms and non-living objects
4.
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) 5000 k J
b) 500 k J
c) 50 k J
d) 5 k J
5.
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
a) accumulation
b) eutrophication
c) biomagnification
d) pollution
6.
Depletion of ozone is mainly due to
a) CFCs
b) Methane
c) Oxygen
d) pesticides
7.
Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
a) producers
b) herbivores
c) carnivores
d) omnivores
8.
In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of
a) chemical energy
b) light energy
c) heat energy
d) none of these
9.
Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the
a) ecological pyramid
b) food web
c) food chain
d) ecosystem
10.
Flow of energy in an ecosystem is always
a) unidirectional
b) bidirectional
c) multidirectional
d) no direction
11.
Excessive exposure of humans to UV-rays results in
a) skin cancer
b) damage to eyes
c) damage to immune system
d) all of these
12.
In the following groups of materials, which group (s) contains only non-biodegradable items?
a) Polythene, detergent, PVC
b) Wood, paper, leather
c) Plastic, detergent, grass
d) Wood, plastic, detergent
13.
Which of the statement is incorrect?
a) Green plants get their food from organic compounds
b) Plants convert solar energy into chemical energy
c) All green plants and blue-green algae are producers
d) Producers prepare their own food from inorganic compounds
14.
Which group of organisms are not constituents of a food chain?
a) Wolf, grass, snake, tiger
b) Grass, lion, rabbit, wolf
c) Plankton, man, fish, grasshopper
d) None of these
15.
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about
a) 1%
b) 5%
c) 10%
d) 9%
16.
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
17.
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
18.
Disposable plastic plates should not be used because
a) they are made of non-biodegradable materials
b) they are made of biodegradable materials
c) they are made of materials with lightweight
d) they are made of organic materials
19.
Which of the two sets belong to the same trophic level?
a) Vulture : Rat
b) Rabbit: Tiger
c) Frog : Lizard
d) Grasshopper : Hawk
20.
Which of these is a greenhouse gas?
a) Methane
b) Ozone
c) Carbon monoxide
d) All of these
21.
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
d) all of these
22.
Which of the following is an example of herbivores?
a) cow
b) shark
c) lion
d) wolf
23.
The number of atoms of oxygen present in ozone are
a) 3
b) 6
c) 12
d) 2
24.
Every food chain in the ecosystem begins with………. which are the original source of food.
a) producers
b) herbivores
c) decomposers
d) parasites
25.
Which among the following is a correct full form for DDT?
a) Dichlorodiphenyltrichloroethane
b) Dichlorodiphenyltetrachloroethane
c) Dichlorodecaphenyltrichloroethane
d) Dichlorodiethyltrichloroethane
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