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MCQ Question for Class 10 Science Chapter 15 Our Environment with Answer
Which of the following is biodegradable waste?
(b) Aluminium can
(c) Plastic bag
(d) Cow dung
Answer: (d) Cow dung
Which of the two sets belong to the same trophic level?
(a) Rabbit: Tiger
(b) Vulture : Rat
(c) Grasshopper : Hawk
(d) Frog : Lizard
Answer: (d) Frog : Lizard
In a given food chain if the amount of energy at the fourth trophic level is 6 kJ, what will be the energy available at the producer level?
(a) 6000 kJ
(b) 20 kJ
(c) 60 kJ
(d) 600 kJ
Answer: (a) 6000 kJ
Which of the following is the best way for disposal of vegetable and fruit peels?
Answer: (c) Composting
The problem caused due to ozone hole is
(b) damage due to UV radiations
(c) chemical pollution
(d) acid rain
Answer: (b) damage due to UV radiations
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
Answer: (c) both living organisms and non-living objects
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
Answer: (c) biomagnification
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
Answer: (c) chemical energy
Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
Answer: (b) producers
Excessive exposure of humans to UV-rays results in
(i) damage to 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)
Answer: (c) (i) and (iii)
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
(d) food chain
Answer: (a) food web
In the given Figure the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?
Answer: (c) T1
Which group of organisms are not the 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)
Answer: (c) (ii) and (iii)
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about
Answer: (a) 1%
Which of the statements is incorrect?
(а) 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
Answer: (b) Green plants get their food from organic compounds
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
Answer: (b) convert organic material to inorganic forms
Disposable plastic plates should not be used because
(а) they are made of materials with light weight
(b) they are made of toxic materials
(c) they are made of biodegradable materials
(d) they are made of non-biodegradable materials
Answer: (d) they are made of non-biodegradable materials
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
(а) 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
Answer: (d) The population of tiger decreases and the population of grass increases
When is the world environment day celebrated?
(a) 16 June
(b) 5 December
(c) 5 June
(d) 5 July
Answer: (c) 5 June
Which of these is a greenhouse gas?
(a) Hydrogen sulphide
(d) Carbon monoxide
Answer: (b) Methane
The transfer of energy in a food chain is always:
Answer: (a) Unidirectional
Which of these organisms are the most important decomposers in an ecosystem?
(a) Algae and fungi
(b) Fungi and bacteria
(c) Algae and bacteria
(d) Bacteria and virus
Answer: (b) Fungi and bacteria
Which of these does not belong to biotic component?
Answer: (d) Soil
Fill in the blanks
1. Biodegradable materials persist in the environment as they have a ……………. nature.
2. Gardens and crop-fields are ……………. type of ecosystems.
3. The amount of energy transferred from a trophic level to the next trophic level is only …………….
4. Growth, reproduction etc. of living organisms are affected by the ……………. components of ecosystem.
5. All consumers are directly or indirectly dependent on ……………. for their energy requirements.
6. A network of food chains is called a …………….
Answer: food web
7. There is always a ……………. flow of energy in a food chain.
8. The increase in concentration of harmful chemicals at successive trophic levels is called …………….
9. Ozone shields the surface of the Earth from ……………. radiation the sun.
Answer: ultraviolet (UV)
10. Forests, ponds and lakes are examples of ……………. type of ecosystems.
Match the following columns
|Column I||Column II|
|(i) Parasites||(a) Abiotic|
|(ii) Crop field||(b) bio-degradable|
|(iii) Synthetic foam||(c) Biotic|
|(iv) pH||(d) Artificial ecosystem|
|(v) Forests||(e) Decomposers|
|(iv) DDT||(f) Scavengers|
|(vii) Wood||(g) Natural ecosystem|
|(viii) Fungi||(h) Biomagnification|
|(ix) Vulture||(i) Non-biodegradable|
|Column I||Column II|
|(i) Parasites||(c) Biotic|
|(ii) Crop field||(d) Artificial ecosystem|
|(iii) Synthetic foam||(a) Abiotic|
|(iv) pH||(h) Biomagnification|
|(v) Forests||(g) Natural ecosystem|
|(iv) DDT||(i) Non-biodegradable|
|(vii) Wood||(b) bio-degradable|
|(viii) Fungi||(e) Decomposers|
|(ix) Vulture||(f) Scavengers|
Complete the crossword given below.
4. These are the chemicals used to kill the pests 
7. A top carnivore 
8. A primary consumer 
9. Bacteria do this to the biodegradable waste 
10. Protects us from UV rays 
1. Vulture is this type of animal 
2. Temperature and soil are these kinds of component of ecosystem 
3. Predators and parasites belong to this component of ecosystem 
5. Term used for a biological community of interacting organisms and their physical environment 
6. All living things need it to function