Question

A. Give reasons for the following.
1. Root hair help to absorb water.
2. Active transport requires energy.
3. NPK salts are important macronutrients.
4. Transpiration helps in the upward movement of water.
5. Transpiration is faster when it is sunny and hot.

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Answer 1

Explanation:

1

Root hairs helps to observe water because this is their function. This happens because the soil water has a higher water potential than the root hair cell cytoplasm. Root hairs have a large surface area for absorption of water. Root hair function is to collect water, mineral and nutrients present in soil.

2

During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP).

3

Nitrogen is considered to be the most important nutrient, and plants absorb more nitrogen than any other element Macronutrients are essential for plant growth and a good overall state of the plant. The primary macronutrients are Nitrogen (N), Phosphorus (P), and Potassium (K)

4

The continuous evaporation of water (or transpiration) from the cells of a leaf crates a kind of suction which pulls up water through the xylem vessles. Thus, transpiration helps in the upward movement of water and dissolved minerals from the roots to the leaves through the stem.

5

Tranpiration is faster when it is sunny and hot as when it is hot water in the leaves evaporate faster (transpirate) . Therefore Transpiration is faster when it is sunny and hot.

Answer 2

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Root hair help to absorb water.

1) Plants absorb water from the soil by osmosis. They absorb mineral ions by active transport, against the concentration gradient. Root hair cells are adapted for taking up water and mineral ions by having a large surface area to increase the rate of absorption.

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Active transport requires energy

2) Active transport requires energy because it is not a passive process. The molecule has to go against the concentration gradient. Hence it requires energy to be carried by the carrier proteins.

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NPK salts are important macronutrients.

3) Nitrogen is considered to be the most important nutrient, and plants absorb more nitrogen than any other element Macronutrients are essential for plant growth and a good overall state of the plant. The primary macronutrients are Nitrogen (N), Phosphorus (P), and Potassium (K).

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Transpiration helps in the upward movement of water.

4) The continuous evaporation of water (or transpiration) from the cells of a leaf crates a kind of suction which pulls up water through the xylem vessles. Thus, transpiration helps in the upward movement of water and dissolved minerals from the roots to the leaves through the stem.

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Transpiration is faster when it is sunny and hot.

5) Tranpiration is faster when it is sunny and hot as when it is hot water in the leaves evaporate faster (transpirate) . Therefore Transpiration is faster when it is sunny and hot.

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