Hypotheses Explaining Latitudinal Gradient of Biodiversity

Q.

What are mega biodiversity countries?

Q.

Which of the following regions of the globe exhibits the highest species diversity?

1. Himalayas

2. Amazon forests

3. The Western Ghats in India

4. Madagascar

Q. Which region has the highest diversity in terms of number of species?

1. Tropical region
2. Sub-tropical region
3. Arctic region
4. Desert region

Q.

Give three hypotheses for explaining why tropics show greatest levels of species richness?

Q.

Choose how many of the given statements are not correct about the Tropics?

(i) Greater species diversity compared to Temperate

(ii) Subjected to frequent glaciations in the past

(iii) Great seasonal variations are seen here

(iv) Environment is relatively constant

1. One

2. Two

3. Three

4. Four

Q. Tropics have a greater biodiversity than the temperates or the Arctic Tundra because

1. Tropics are homogeneous
2. Rainforests show the greatest amount of species richness
3. There are very few vascular plants in the Arctic tundra
4. Speciation is a function of time and area

Q. Which of the following statements is/are true?

I. Temperate regions have more species diversification than tropical regions
II. Tropical environments have more species diversity than temperate regions
III. Niche specialisation is observed more in temperate regions
IV. Higher productivity is seen in tropical regions

1. I and II
2. IV only
3. II and IV
4. III only

Q.

Read the statements A and B. Identify the correct option.
Statement A: Diversity observed in an entire geographical area is called gamma diversity.
Statement B: Biodiversity decreases as you move from a higher altitude towards a lower altitude.

1. Both the statement a and b are wrong

2. Both the statements a and b arecorrect

3. Statement a is correct, b is wrong

4. Statement b is correct, a is wrong.

Q. A small limited habitat within a larger, more extensive habitat is called a microhabitat.

With regard to the assertion and reason, choose the correct option:

Assertion [A]: Rainforests show high biodiversity.
Reason [R]: Rainforests have a large number of microhabitats.

1. Both A and R are correct and R explains A
2. Both A and R are correct but R does not explain A
3. A is incorrect but R is correct
4. Both A and R are incorrect

Q. Which of the following rainforests is home to more than 40, 000 species of plants, 3, 000 species of fishes, 1, 300 species of birds, 427 species of mammals, 427 species of amphibians, 378 species of reptiles and more than 125, 000 invertebrates?

1. Amazonian
2. Tropical
3. Arctic tundra
4. Temperate

Q. Give three hypotheses for explaining why tropics show greatest levels of species richness.

Q. Choose the hypothesis put forth to explain latitudinal gradient of biodiversity.

1. All of the above
2. Speciation is a function of time and area
3. Tropics have a highly heterogenous habitat
4. Tropics have a conducive climate
5. Tropics receive the highest amount of sunlight throughout the year and have high productivity

Q. Which region has the highest diversity in terms of number of species?

1. Tropical region
2. Sub-tropical region
3. Arctic region
4. Desert region

Q. State whether true or false:
Rainforest is a homogenous habitat.

1. True
2. False

Q. The most striking difference between tropical rainforest and temperate forest is that

1. The tropical rain forests have preponderance of angiosperms, while the temperate one have preponderance of gymnosperms.
2. The trees of temperate forests are taller than those of tropical rain forests.
3. Plants of temperate forests are comparatively more mesophytic.
4. All of the above.

Q.

Which among the following statements explains why tropical regions have a richer biological diversity than other regions?

1. 33%

2. 53%

3. 60%

4. 36%

Q. Assertion :Diversity observed in an entire geographical area, is called gamma diversity. Reason: Biodiversity decreases from high altitudes to low altitudes.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Tropics have a greater biodiversity than the temperates or the Arctic Tundra because

1. Rainforests show the greatest amount of species richness
2. There are very few vascular plants in the Arctic Tundra
3. Speciation is a function of time and area
4. Tropics are homogeneous

Q. In recent year, there has been a growing concern about the gradually increasing average global temperatures. If this trend continues, would you expert the distributional range of some species to be affected?

Q. Which of the following statements is/are true?

I. Temperate regions have more species diversification than tropical regions
II. Tropical environments have more species diversity than temperate regions
III. Niche specialisation is observed more in temperate regions
IV. Higher productivity is seen in tropical regions

1. I and II
2. III only
3. IV only
4. II and IV

Q. Which region is rich in species diversity?

1. North Pole
2. South Pole
3. Temperate region
4. Tropical region

Q.

Give three hypotheses for explaining why tropics show greatest levels of species richness.

Q.

How does sunlight help tropical ecosystems develop relatively more vibrant flora and fauna?

1. Rajasthan

2. Assam

3. Bihar

4. Gujarat

Q. Which one is referred as lungs of planet earth?

1. Western ghats
2. Lake victoria
3. Greenland
4. Amazon rain forest
5. Himalaya

Q. Which of the following rainforests is home to more than 40, 000 species of plants, 3, 000 species of fishes, 1, 300 species of birds, 427 species of mammals, 427 species of amphibians, 378 species of reptiles and more than 125, 000 invertebrates?

1. Tropical
2. Temperate
3. Boreal
4. Both A and B

Q. Where more than half of the species on the earth live?

1. Temperate zone
2. Tropical zone
3. Dry tropical forest
4. Moist tropical forests

Q. Does geographical isolation of the individual of a species lead to formation of a new species? Provide a suitable explanation.

Q. What is the source of variation in human skin color?

1. Changes in environment throughout history.
2. Genetic drift occurring during bottleneck events.
3. Human migrations to different environments.
4. Mutations to the genes that code for the proteins determining skin color.

Q. Choose the correct answers from the alternatives given .
Extensive adaptive radiations have usually followed in the wake of mass extinctions mainly because

1. Many adaptive zones are vacated
2. Conditions of the physical environment are usually at their most favourable after some crisis has passed
3. The survivors have superior adaptations that enable them to spill into many environments when conditions improve after the extinction episode
4. Given a stable environment, biological diversity tends to increase

Q. A small limited habitat within a larger, more extensive habitat is called a microhabitat.

With regard to the assertion and reason, choose the correct option:

Assertion [A]: Rainforests show high biodiversity.
Reason [R]: Rainforests have a large number of microhabitats.

1. Both A and R are correct and R explains A
2. Both A and R are correct but R does not explain A
3. A is incorrect but R is correct
4. Both A and R are incorrect