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Plant-Soil Interactions

Description: Test your knowledge on the intricate relationship between plants and soil, delving into the fascinating world of plant-soil interactions.
Number of Questions: 15
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Tags: botany plant physiology soil science ecology
Attempted 0/15 Correct 0 Score 0

Which of the following is NOT a primary macronutrient required by plants from the soil?

  1. Nitrogen

  2. Phosphorus

  3. Potassium

  4. Calcium


Correct Option: D
Explanation:

Calcium is a secondary macronutrient, while nitrogen, phosphorus, and potassium are primary macronutrients essential for plant growth.

The process by which plants absorb water and nutrients from the soil is known as:

  1. Transpiration

  2. Photosynthesis

  3. Respiration

  4. Absorption


Correct Option: D
Explanation:

Absorption is the process by which plants take in water and nutrients from the soil through their roots.

Which soil texture is known for its excellent drainage and aeration, making it ideal for root growth?

  1. Sandy soil

  2. Clay soil

  3. Loam soil

  4. Silt soil


Correct Option: A
Explanation:

Sandy soil has large pore spaces, allowing for good drainage and aeration, which promotes root growth.

The symbiotic relationship between certain plants and fungi, where the fungus helps the plant absorb nutrients from the soil, is known as:

  1. Mycorrhizae

  2. Nitrogen fixation

  3. Rhizobia

  4. Nitrification


Correct Option: A
Explanation:

Mycorrhizae is a mutually beneficial relationship between plants and fungi, where the fungus helps the plant absorb nutrients from the soil, while the plant provides the fungus with carbohydrates.

The process by which bacteria convert atmospheric nitrogen into a form usable by plants is called:

  1. Nitrogen fixation

  2. Nitrification

  3. Denitrification

  4. Ammonification


Correct Option: A
Explanation:

Nitrogen fixation is the process by which bacteria convert atmospheric nitrogen into a form usable by plants, such as nitrates and ammonium.

Which soil pH range is generally considered optimal for most plants?

  1. 4.0 - 5.0

  2. 6.0 - 7.0

  3. 8.0 - 9.0

  4. 10.0 - 11.0


Correct Option: B
Explanation:

Most plants thrive in slightly acidic to neutral soil pH, typically ranging from 6.0 to 7.0.

The process by which organic matter in the soil is broken down into simpler compounds is known as:

  1. Decomposition

  2. Humification

  3. Mineralization

  4. Nitrification


Correct Option: A
Explanation:

Decomposition is the process by which organic matter in the soil is broken down into simpler compounds by microorganisms.

Which soil horizon is characterized by the accumulation of organic matter and is typically darker in color?

  1. O horizon

  2. A horizon

  3. B horizon

  4. C horizon


Correct Option: A
Explanation:

The O horizon is the uppermost soil horizon, composed of organic matter and is typically darker in color due to the presence of humus.

The ability of soil to hold and release water for plant use is referred to as:

  1. Water-holding capacity

  2. Permeability

  3. Infiltration rate

  4. Bulk density


Correct Option: A
Explanation:

Water-holding capacity refers to the ability of soil to hold and release water for plant use.

The process by which nutrients are released from organic matter into a form usable by plants is called:

  1. Mineralization

  2. Nitrification

  3. Denitrification

  4. Immobilization


Correct Option: A
Explanation:

Mineralization is the process by which nutrients are released from organic matter into a form usable by plants.

Which soil texture is known for its high water-holding capacity but poor drainage?

  1. Sandy soil

  2. Clay soil

  3. Loam soil

  4. Silt soil


Correct Option: B
Explanation:

Clay soil has small pore spaces, resulting in poor drainage but high water-holding capacity.

The process by which bacteria convert nitrates into nitrogen gas, releasing it into the atmosphere, is known as:

  1. Nitrogen fixation

  2. Nitrification

  3. Denitrification

  4. Ammonification


Correct Option: C
Explanation:

Denitrification is the process by which bacteria convert nitrates into nitrogen gas, releasing it into the atmosphere.

The process by which bacteria convert ammonium into nitrates is called:

  1. Nitrogen fixation

  2. Nitrification

  3. Denitrification

  4. Ammonification


Correct Option: B
Explanation:

Nitrification is the process by which bacteria convert ammonium into nitrates.

The layer of soil that is formed from the weathering of parent rock is known as:

  1. O horizon

  2. A horizon

  3. B horizon

  4. C horizon


Correct Option: D
Explanation:

The C horizon is the layer of soil that is formed from the weathering of parent rock.

The process by which plants release water vapor into the atmosphere through their leaves is called:

  1. Transpiration

  2. Photosynthesis

  3. Respiration

  4. Absorption


Correct Option: A
Explanation:

Transpiration is the process by which plants release water vapor into the atmosphere through their leaves.

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