Check the below NCERT MCQ Questions for Class 10 Science Chapter 15 Our Environment with Answers Pdf free download. MCQ Questions for Class 10 Science with Answers were prepared based on the latest exam pattern. We have Provided Our Environment Class 10 Science MCQs Questions with Answers to help students understand the concept very well.
Class 10 Science Biology Chapter 15 MCQ With Answers
You can refer to NCERT Solutions for Class 10 Science Chapter 15 Our Environment to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.
Biology Class 10 Chapter 15 MCQs on Our Environment
Question 1.
Which of the following is biodegradable waste?
(a) DDT
(b) Aluminium can
(c) Plastic bag
(d) Cow dung
Answer
Answer: (d) Cow dung
Question 2.
Which of the two sets belong to the same trophic level?
(a) Rabbit: Tiger
(b) Vulture : Rat
(c) Grasshopper : Hawk
(d) Frog : Lizard
Answer
Answer: (d) Frog : Lizard
Question 3.
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
Answer: (a) 6000 kJ
Question 4.
Which of the following is the best way for disposal of vegetable and fruit peels?
(a) Landfill
(b) Recycling
(c) Composting
(d) Burning
Answer
Answer: (c) Composting
Question 5.
The problem caused due to ozone hole is
(a) earthquakes
(b) damage due to UV radiations
(c) chemical pollution
(d) acid rain
Answer
Answer: (b) damage due to UV radiations
Question 6.
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
Answer: (c) both living organisms and non-living objects
Question 7.
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
Answer
Answer: (c) biomagnification
Question 8.
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
Answer: (c) chemical energy
Question 9.
Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
(a) decomposers
(b) producers
(c) herbivores
(d) carnivores
Answer
Answer: (b) producers
Question 10.
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
Answer: (c) (i) and (iii)
Question 11.
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
Answer
Answer: (a) food web
Question 12.
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
Answer
Answer: (c) T1
Question 13.
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
Answer: (c) (ii) and (iii)
Question 14.
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%
Answer
Answer: (a) 1%
Question 15.
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
Answer: (b) Green plants get their food from organic compounds
Question 16.
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
Answer: (b) convert organic material to inorganic forms
Question 17.
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
Answer: (d) they are made of non-biodegradable materials
Question 18.
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
Answer: (d) The population of tiger decreases and the population of grass increases
Question 19.
When is the world environment day celebrated?
(a) 16 June
(b) 5 December
(c) 5 June
(d) 5 July
Answer
Answer: (c) 5 June
Question 20.
Which of these is a greenhouse gas?
(a) Hydrogen sulphide
(b) Methane
(c) Ozone
(d) Carbon monoxide
Answer
Answer: (b) Methane
Question 21.
The transfer of energy in a food chain is always:
(a) Unidirectional
(b) Methane
(c) Bi-directional
(d) Random
Answer
Answer: (a) Unidirectional
Question 22.
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
Answer: (b) Fungi and bacteria
Question 23.
Which of these does not belong to biotic component?
(a) Parasites
(b) Fungi
(c) Bacteria
(d) Soil
Answer
Answer: (d) Soil
Fill in the blanks
1. Biodegradable materials persist in the environment as they have a ……………. nature.
Answer
Answer: Inert
2. Gardens and crop-fields are ……………. type of ecosystems.
Answer
Answer: artificial
3. The amount of energy transferred from a trophic level to the next trophic level is only …………….
Answer
Answer: 10%
4. Growth, reproduction etc. of living organisms are affected by the ……………. components of ecosystem.
Answer
Answer: abiotic
5. All consumers are directly or indirectly dependent on ……………. for their energy requirements.
Answer
Answer: producers
6. A network of food chains is called a …………….
Answer
Answer: food web
7. There is always a ……………. flow of energy in a food chain.
Answer
Answer: unidirectional
8. The increase in concentration of harmful chemicals at successive trophic levels is called …………….
Answer
Answer: biomagnifications
9. Ozone shields the surface of the Earth from ……………. radiation the sun.
Answer
Answer: ultraviolet (UV)
10. Forests, ponds and lakes are examples of ……………. type of ecosystems.
Answer
Answer: natural
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 |
Answer
Answer:
| 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.
Across
4. These are the chemicals used to kill the pests [9]
7. A top carnivore [4]
8. A primary consumer [4]
9. Bacteria do this to the biodegradable waste [9]
10. Protects us from UV rays [5]
Down
1. Vulture is this type of animal [9]
2. Temperature and soil are these kinds of component of ecosystem [7]
3. Predators and parasites belong to this component of ecosystem [6]
5. Term used for a biological community of interacting organisms and their physical environment [9]
6. All living things need it to function [6]
Answer
Answer:
Across:
4. Particide
7. Lion
8. Goat
9. Decompose
10. Ozone
Down:
1. Scavenger
2. Abiotic
3. Biotic
5. Pesticides
6. Energy
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