Chapter 15 Life on the Earth

1. consider the following  statement regarding The interactions of a particular

group of organisms with abiotic factors within a particular habitat resulting

in clearly defined energy flows and material cycles on land, water and air.

Choose the correct answer

2. Which of the following is a part of the biosphere?

3. Consider the following statement in terms of ecosystem.

1. The size of an ecosystem might range from a little pond to a vast forest or a sea.
2. In an ecosystem, all biotic and abiotic components are interconnected and interact with one another.
3. Terrestrial habitats include grasslands and deserts.
4. Any ecosystem’s ability to function and sustain itself is contingent on a steady supply of solar energy.

Which of the following assertions is/are correct?

4. Take a look at the following statement on the Terrestrial Ecosystem.

1. Herbaceous and woody plants are major producers in a terrestrial ecosystem.
2. In a terrestrial environment, the detritus food chain carries a substantially higher proportion of energy than the GFC (grazing food chain).

Select the incorrect response.

5. Tropical grasslands are also known as:

6. Which of the following statements best describes a terrestrial ecosystem?

1. Forest
2. desert
3. estuary
4. lake

Choose the correct answer

7. Take a look at the following remark on the aquatic ecology.

1. Phytoplankton is one of the primary producers in an aquatic ecosystem.
2. The GFC (grazing food chain) is the primary energy channel in an aquatic ecosystem.
3. Light is the limiting element for productivity in aquatic habitats.

Select the correct response.

8. Oxygen combines with iron found in the rocks to form:

9. Which of the following statements best describes an aquatic ecosystem?

1. pond
2. lake
3. estuary
4. wetland

Choose the correct answer

10. Take a look at the following biome statements.

1. Climate is the primary determinant of the boundaries between distinct biomes on land.
2. It is the chemical mechanism through which plants and some microbes capture and fix the sun’s energy biologically.
3. A biome is a large-scale plant-animal community that spans a vast geographic area.

Which of the following assertions is/are correct?

11. Which of the following sentences exemplifies the concept of abiotic factors?

1. inorganic substances
2. producers
3. decomposers
4. atmospheric humidity

Choose the correct answer

12. Carbon dioxide interacts with water in the presence of sunshine during photosynthesis to form:

13. Take a look at the following statement.

1. Photosynthesis is the process of food synthesis that takes place in the presence of sunshine.
2. To carry out the process of photosynthesis, just sunlight and water are required.

Select the correct response.

14. Take a look at the following remark on the detritus food web.

1. The detritus food chain (DFC) begins with animals and plants at any time.
2. In a terrestrial ecosystem, the detritus food chain carries a significantly higher proportion of energy.

Select the correct response.

15. Take a look at the following statement on the Carbon Cycle.

1. Biological nitrogen accounts for 90% of fixed nitrogen.
2. Lightning and cosmic radiation can fix nitrogen in the atmosphere.
3. Denitrification, the process of converting nitrates to free nitrogen.

Select the correct response.