Reservoir of Minerals

Q. Soil acts as a reservoir for plants because it

1. supplies mineral nutrients
2. does not hold water
3. supplies air to roots
4. stabilises the plants

Q.

Identify the correct statements related to soil

A. Soil acts as a matrix and stabilizes the plant

B. Soil is the source for both inorganic and organic solutes

C. Soil holds water and supplies air to the roots

D. Soil acts as a reservoir of gasses

1. A, B, C and D

2. C & D

3. A & C

4. B & C

Q. Formation of soil from parent rock occurs through a process called __.

Q. The majority of the nutrients that are essential for the growth and development of plants become available due to

1. Supply of fertilizers to plants periodically

2. Weathering and breakdown of rocks

3. Microbial action on atmospheric gases

4. Percolation of rainwater into soil

Q.

Which of the following is not a method used to preserve the fertility of topsoil?

1. clearing a field of all plants occasionally so that the nutrients are not being used up and can replenish

2. plowing under plant materials left in the field

3. the addition of fertilizers increases nutrient levels

4. crop rotation

Q.

The transfer of minerals from top soil to sub soil through soil water is called

1. Transpiration

2. Conduction

3. Percolation

4. Leaching

Q.

The transfer of minerals from top soil to sub soil through soil water is called

1. Transpiration

2. Conduction

3. Percolation

4. Leaching

Q. Study the following statements (I - IV) related to soil salinity due to waterlogging and arrange them in the correct sequence.

I. Draw salt to the surface of the soil.
II. Waterlogging in the soil.
III. The salt is deposited as a thin crust on the land surface or on the roots of the plants.
IV. Irrigation without proper drainage of water.

1. I → II → III → IV
2. I → III → IV → II
3. III → I → IV → II
4. IV → II → I → III

Q. Assertion :In tropical rain forests, O-horizon and A-horizon of soil profile are shallow and nutrient-poor. Reason: Excessive growth of micro-organisms in the soil depletes its organic content.

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.

The preservation of topsoil is important because

1. It contains the minerals necessary for plant growth

2. It holds water and it contains organisms that break down organic debris

3. Most roots are located in the topsoil

4. All of the above

Q. Assertion :In tropical rain forests, O horizon and A horizon of soil profile are shallow and nutrient-poor. Reason: Excessive growth of micro-organisms in the soil depletes its organic content.

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.

Which of the following statements will not hold true if a plant is grown in only sand (S), only clay (C) and only humus (H)?

1. Water availability to the roots will be more in (C) and (H) as compared to (S).

2. Ability of roots to penetrate (S) and (H) will be low as compared to (C).

3. Nutrient availability to roots will be less in (S) as compared to (C) and (H).

4. Oxygen availability to roots will be low in (C) as compared to (S) and (H).

Q. When a soil has been thoroughly wetted and then allowed to drain until the capillary movement of the water has stopped, the water content of the soil will give the estimate of its

1. Capillary water
2. Field capacity
3. Gravitational water
4. Storage capacity

Q. Soil acts as a reservoir for plants because it

1. supplies mineral nutrients
2. does not hold water
3. supplies air to roots
4. stabilises the plants

Q. Formation of soil from parent rock occurs through a process called __.

Q. Based on our retrospective view, Von Helmont's famous experiment on the growth of a willow tree mainly demonstrated that

1. The tree increased in mass mainly by absorbing water
2. The increase in the mass of the tree could not be accounted for by the consumption of soil
3. Most of the increase in the mass of the tree was due to the uptake of oxygen
4. Soil simply provides physical support for the tree without providing nutrients

Q. Standing state means

1. Energy trapped by producers
2. Amount of biomass per unit area
3. Rate of energy produced by consumers
4. Quantity of solar energy

Q.

The preservation of topsoil is important because

1. it contains the minerals necessary for plant growth

2. it holds water and it contains organisms that break down organic debris

3. most roots are located in the topsoil

4. all of the above

Q. Soil acts as a reservoir for plants because it

1. supplies mineral nutrients
2. does not hold water
3. supplies air to roots
4. stabilises the plants

Q.

_______ occurs when acid rain adds hygrogen ions to the soil which interact chemically with existing minerals.

Q. Mark the following statements true or false. Rewrite them correctly.
(a) The parent material contains the remains of dead plants and animals.
(b) Plants take root in the surface layer.
(c) Parent material contains mostly rock particles.
(d) The subsoil contains large quantities of organic material.
(e) A thick layer of fertile topsoil helps plant growth.
(f) Plants use the water and minerals found in surface layer for growth.
(g) Bedrock containing large unweathered rock is found below the parent material.

Q. Soil provides water and .............. to plants.