Causes of Biodiversity Losses MCQs and Answers

Are you looking for Causes of Biodiversity Losses MCQs and Answers for medical entrance examinations? If yes, these are some most important multiple choice questions and answers on NCERT Class-12 Biology, Chapter-15 (Biodiversity and Conservation).

Here we composed these Causes of Biodiversity Losses MCQs and Answers after reading the chapter on Biodiversity and Conservation from the NCERT book on Class 12 Biology. The questions are topics-wise and the students can relate the questions easily to the most important topics of this chapter.

Causes of Biodiversity Losses MCQs and Answers

1. What does ‘The Evil Quartet’ describes?

a) An increase in the number of species

b) The decrease in the number of species

c) Mass extinction

d) Formation of the universe

Answer: b


2. Which one of the following is said to be the most important cause or reason for the extinction of animals and plants?

a) Loss of habitat and fragmentation

b) Over-exploitation of species

c) Invasion of alien species

d) Co-extinctions

Answer: a


3. Previously how much of the Earth’s land surface was covered by the tropical rain forests?

a) 50 %

b) 14 %

c) 24 %

d) 35 %

Answer: b


4. Currently, how much area of the Earth’s land surface is covered by the tropical rain forests?

a) 90 %

b) 50 %

c) 1 %

d) 6 %

Answer: d


5. Which of the following rain forest is known as ‘lungs of the planet’?

a) The African rain forest

b) The Australian rain forest

c) The Amazon rain forest

d) The Southeast Asian rain forest

Answer: c


6. Which animals are badly affected when a large habitat is broken up into small fragments due to various human activities?

a) Extinct species

b) Migratory species

c) Non-migratory species

d) Humans

Answer: b


7. What are the excess and the unsustainable use of resources called?

a) Loss of habitat and fragmentation

b) Co-extinctions

c) Invasion of alien species

d) Over-exploitation

Answer: d


8. What was the reason for the exploitation of the Steller’s sea cow and the passenger pigeon?

a) Competition

b) Loss of habitat

c) Human activities

d) Mutualistic relationships

Answer: c


9. What happens when alien species are introduced unintentionally or deliberately?

a) Decrease of alien species

b) Increase in habitat

c) They turn invasive and cause increase species

d) They turn invasive and cause decline or extinction of indigenous species

Answer: d


10. What happened when the Nile perch introduced into Lake Victoria in east Africa?

a) Extinction of trees

b) Increase in the number of trees

c) Extinction of cichlid fish

d) Increase in the number of cichlid fish

Answer: c


11. Which of the following contains chemicals like parthenin, is toxic to cattle and cause pollen allergy in humans?

a) Nile perch

b) The carrot grass

c) Rose

d) Wheat

Answer: b


12. What is Eicchornia called?

a) The carrot grass

b) Nile perch

c) Water hyacinth

d) Water lily

Answer: c


13. Why was the African catfish Clarias gariepinus introduced?

a) Horticulture

b) Aquaculture

c) Sericulture

d) Poultry

Answer: b


14. Which phenomenon explains that ‘When a species becomes extinct, the plant and animal species also become extinct that are obligatorily associated with the host species’?

a) Aquaculture

b) Fragmentation

c) Invasion

d) Co-extinction

Answer: d


15. Which phenomenon does the coevolved plant-pollinator mutualism explain?

a) Co-extinction

b) Fragmentation

c) Invasion

d) Loss of habitat

Answer: a


Biodiversity loss is a huge problem that is affecting our planet in a big way. There are many causes of biodiversity loss, and it is important to be aware of them so that we can take steps to prevent them.

One of the main causes of biodiversity loss is habitat loss. This can happen when natural habitats are destroyed or degraded by human activities. For example, when forests are cleared for agriculture, this can lead to the loss of many different species of plants and animals. Habitat loss is often caused by things like pollution, climate change, and the introduction of invasive species.

Another major cause of biodiversity loss is over-exploitation. This happens when species are harvested at unsustainable rates, for things like food, medicine, or pet trade. This can lead to population crashes and even extinction. Over-exploitation is often driven by human greed and can be a very hard problem to solve.

These are just some of the main causes of biodiversity loss. There are many others, and it is important to be aware of the ways we might be causing it. We need to take action to protect our planet and the wonderful biodiversity it contains.

FAQs on Causes of Biodiversity Losses

What is biodiversity loss?

Biodiversity loss is the process by which a species or community becomes extinct. This can happen through natural causes, like a change in the environment, or through human activities, like hunting or pollution.

Biodiversity loss is a major problem because it can lead to the extinction of entire species, which can have a negative impact on the ecosystem. humans rely on biodiversities for many things, like food, medicine, and clean air and water.

What are some of the main causes of biodiversity loss?

The main causes of biodiversity loss are habitat destruction, pollution, and climate change. These problems are caused by human activities, like logging, mining, and farming.

What are the effects of biodiversity loss?

The effects of biodiversity loss can be devastating. It can lead to the extinction of species, which can have a ripple effect on the ecosystem. Biodiversity loss can also cause problems for humans, like a loss of food and water sources, and an increase in diseases.

What can be done to reduce biodiversity loss?

There are many things that can be done to reduce biodiversity loss. One of the most important things is to protect habitats, like forests and wetlands. Another important thing is to reduce pollution and climate change.

Have any other questions about the Causes of Biodiversity Losses? Leave a comment below and we’ll do our best to answer them!

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