Primary purpose of pond fertilization is _?

C. To increase primary productivity

Which is not a cause of land pollution?

D. All of these are causes of land pollution

What type of populations follow J-shaped growth curves?

B. Exponential growth populations

Everyday Science · Environment, Weather & Ecology · page 28 of 40

Ecosystem MCQs with Answers

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Ecosystem, Biodiversity & Conservation MCQs (271–280)

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Past paper MCQs in this chapter · See all past papers

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271.
Most seriously affected crops by vertebrate pests include ?
Correct Answer: D. All of these
One-liner
Vertebrate pests such as rodents, birds, and wild mammals seriously affect all of these — wheat, rice, sugarcane, maize, fruits, and vegetables alike.
272.
Primary purpose of pond fertilization is _?
Correct Answer: C. To increase primary productivity
One-liner
The primary purpose of pond fertilization is to increase primary productivity by boosting the growth of phytoplankton and other primary producers.
273.
Which is not a cause of land pollution?
Correct Answer: D. All of these are causes of land pollution
One-liner
All of these are causes of land pollution — deforestation, industrial waste dumping, and excessive use of pesticides all contribute significantly to land pollution.
274.
Newspaper can be recycled again and again how many times?
Correct Answer: B. 5
One-liner
Newspaper can be recycled again and again up to 5 times before the paper fibers become too short and weak to be reused.
275.
What type of populations follow J-shaped growth curves?
Correct Answer: B. Exponential growth populations
One-liner
Populations exhibiting exponential growth follow J-shaped growth curves.
276.
In marine ecosystems, the region that extends from the splash zone of ocean waves to low tide waves is called ?
Correct Answer: C. Intertidal zone
One-liner
The region extending from the splash zone of ocean waves to the low tide mark is called the intertidal zone.
277.
Proper liming can improve _ availability and greatly enhance pond productivity.
Correct Answer: B. Phosphorus
One-liner
Proper liming improves phosphorus availability and greatly enhances pond productivity.
278.
Decline in fitness of hybrids or out-crossed genotype occurs due to ?
Correct Answer: A. Genetic swamping
One-liner
The decline in fitness of hybrids or out-crossed genotypes occurs due to genetic swamping, where local adaptations are diluted by gene flow from a larger population.
279.
Past Paper MCQ
Which of the following is non-biodegradable?
Correct Answer: C. Nylon
One-liner
Nylon is a non-biodegradable synthetic polymer that cannot be decomposed by microorganisms.
280.
Insect and plant diversity declined during the Cretaceous extinction, but then has been increasing in the last _ million years.
Correct Answer: D. 65
One-liner
Insect and plant diversity declined during the Cretaceous extinction but has been increasing in the last 65 million years.

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Ecosystem MCQs with Answers

Ecosystem, Biodiversity & Conservation MCQs (271–280)

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