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Science
10th
grade
CBSE Class 10 Science Chapter 15: Our Environment
25 questions
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- 1. Multiple Choice
Every food chain in the ecosystem begins with………., which are the original source of food.
Saprophytes
Parasites
Producers
Herbivores
- 2. Multiple Choice
We should reduce the use of the plastic bags, bottles etc. because:
They are not durable
They are non-biodegradable
They are made of toxic materials
They react with the atmospheric gases
- 3. Multiple Choice
Among the following choose the correct option which contains only biodegradable items?
(i) Wood, paper, PVC
(ii) Paper, seeds, detergent,
(iii) Paper, animal excreta, wood
(iv) Wool, leaves, paper
(i), (ii) and (iii)
(i) and (iii)
(ii), (iii) and (iv)
(iii) and (iv)
- 4. Multiple Choice
Which among the following statements is incorrect in view of the plants?
They convert the solar energy into mechanical energy
They prepare their food from organic compounds
They are also called producers
They are the initial source of energy in a food chain
- 5. Multiple Choice
In a food chain the second trophic level is occupied by:
Carnivores
Autotrophs
Herbivores
Producers
- 6. Multiple Choice
Green plants utilize ……… percent of sun’s energy to prepare their food by the process of photosynthesis?
1%
10%
20%
99%
- 7. Multiple Choice
The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as:
Biological magnification
Biological accumulation
Chemical magnification
Chemical accumulation
- 8. Multiple Choice
Which of the following may be a conclusion of the excessive exposure of humans to sun’s ultraviolet rays?
(i). Peptic ulcers
(ii). Eye disease like cataract
(iii). Damage to lungs
(iv). Skin cancer
(i) and (iv)
(ii), (iii) and (iv)
(ii) and (iv)
Only (iv)
- 9. Multiple Choice
Which among the following is a correct full form for DDT?
Dichloro Diphenyl Trichloro ethane
Dichloro Diphenyl Tetrachloro ethane
Dichloro Decaphenyl Trichloro ethane
Dichloro Diethyl Trichloro ethane
- 10. Multiple Choice
If 100 J energy is available at the producer level in a food chain then the energy available to the secondary consumer will be:
10 J
0.1 J
1 J
0.01 J
- 11. Multiple Choice
Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?
Gamma radiations
Cosmic radiations
Infrared radiations
Ultraviolet radiations
- 12. Multiple Choice
The substance which is chiefly responsible for the depletion of ozone layer is:
- 13. Multiple Choice
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
The population of tiger increases
The population of grass decreases
Tiger will start eating grass
The population of tiger decreases and the population of grass increases
- 14. Multiple Choice
Which of the following substances will not be converted to compost when added in a composting pit?
Waste paper
Fruit and vegetable peels
Human and animal excreta
Plastic bags
- 15. Multiple Choice
Global warming is a phenomenon related to:
Evaporation
Ecological balance
Greenhouse effect
Desertification
- 16. Multiple Choice
______ is a biodegradable substance.
Polythene
Paper
Plastic
Glass
None of the above
- 17. Multiple Choice
_________is a non-biodegradable substance.
Human/ animal waste
Newspaper
Aluminium
Plant products
None of the above
- 18. Multiple Choice
The _________ is the functional unit of environment.
Genus
Ecosystem
Class
Biome
None of the above
- 19. Multiple Choice
________ are producers.
Amoeba
Mushrooms
Sunlight
Green plants
None of the above
- 20. Multiple Choice
___________ is not an abiotic factor.
Humidity
Animals
Temperature
Altitude
None of the above
- 21. Multiple Choice
_______ is a herbivore.
Whales
Eagle
Bear
Cow
None of the above
- 22. Multiple Choice
__________ are biotic factors.
Mountains
Rocks
Grass
All of the above
None of the above
- 23. Multiple Choice
A ____ is considered a terrestrial ecosystem.
Ocean
Pond
Underground caves
Forest
Noneof the above
- 24. Multiple Choice
_______ is an omnivore.
Panther
Bear
Wolf
Lion
None of the above
- 25. Multiple Choice
Ozone has the chemical formula ___________ .
None of the above
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