ISC Class 12th Biology Chapter 5 - Ecology and Environment Important Questions with Answers

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Name any two factors responsible for the loss of biodiversity in a geographical region.

Question 2.

Samson and Dorothy surveyed two islands, ‘A’ and ‘B’. They recorded the relevant data in the following format in their research folder:

	Parameter	Island A	Island B
(a)	Area (A)	45 × 10³ Km²	12 × 10⁵ Km²
(b)	Regression co-efficient (Z)	1	1
(c)	Y-intercept	20	10

Derive the species-richness for each island.
Which island exhibits greater biodiversity? Support your answer with a reason.

Question 3.

The red panda has been listed as an endangered species on the IUCN Red List since 2015. Regional captive breeding programmes have been established in the zoos around the world to protect the red panda from extinction.

Classify the biodiversity conservation programme referred to above.
Mention any other two methods of conservation which belong to the same category.

Question 4.

Explain the role of any two biocontrol agents by mentioning their target pests.

Question 5.

What do you mean by Biochemical Oxygen Demand (BOD)?

Question 6.

List any four effects of global warming

Question 7.

State any four measures to control noise pollution

Question 8.

What is Biochemical Oxygen Demand significance in an aquatic ecosystem?

Question 9.

Explain industrial melanism.

Question 10.

State the role of the following chemicals in the food industry:
(i) Sodium benzoate
(ii) Aspartame

Question 1.

Choose the correct options of the following question:

Montreal Protocol aims at:

Reduction of ozone-depleting substances

Biodiversity conservation’

Control of water pollution

Control of CO₂ emission.

Question 2.

Discuss the various In-situ and Ex-situ strategies for conservation of biodiversity.

Question 3.

Assertion: PAN is a secondary pollutant.

Reason: The secondary pollutants are produced by the combination of primary emitted pollutants in the atmosphere.

Both assertion and reason are true, and reason is the correct explanation of assertion.

Both assertion and reason are true, but reason is not the correct explanation of assertion.

Assertion is true but reason is false.

Both assertion and reason are false.

Question 4.

Why does a large ozone hole develop specifically over Antarctica?

Question 5.

The level of air pollution is very high in a city. Suggest any four measures which should be taken by the government to control it.

Question 6.

The scientists from a research institute collected samples of

water from sewage pipes of two different cities, A and B.

On analysis, the BOD value of the sample from city A was

found to be 500 mg/L. The BOD value of the sample from

city B was 200 mg/L.

Which one of the two cities needs a sewage treatment plant?
Briefly discuss the steps involved in the treatment of sewage.
What will be the effect of sewage treatment on the value of BOD?

Question 7.

What happens to an inferior competitor if the superior competitor is removed from the environment?

Question 8.

Scientific term for the first formed category of photosynthetic organisms.

Question 9.

Expand NADP

Question 10.

Give reasons for the following:

At higher temperatures, green plants start evolving CO₂ instead of O₂.

Other CISCE Board Class 12th Biology Chapter Wise Questions

Genetics and Evolution

Biology and Human Welfare

Biotechnology and its Applications

Other CISCE Board Class 12th Subjects Important Questions

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ISC Class 12th Biology Chapter 5 - Ecology and Environment Important Questions with Answers

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