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प्रश्न
Enlist some of the advantages of transpiration to green plants.
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उत्तर
It helps to maintain the concentration of the sap inside the plant body. The roots continue to absorb water from the soil. If excess water does not evaporate through transpiration, the sap will become dilute, preventing further absorption of water and minerals from the soil.
The two main advantages of transpiration to green plants are as follows:
- Cooling effect: The water evaporates from the leaf surface during transpiration. The heat required for water evaporation is obtained from the plant itself; thus, the plant cools itself in a hot environment.
- Transpirational pull: The plant's roots pull more water from the soil to compensate for the water loss during transpiration. As a result, important mineral salts, which are essential for plant growth, are also brought along with the water from the soil.
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संबंधित प्रश्न
What are the four functions of the roots?
State if the following statement Is true or false. Correct the statement if it is false.
In an alternate arrangement, a set of three or more leaves grows from the same node
State if the following statement Is true or false. Correct the statement if it is false.
The stem helps in absorbing water from the soil.
State the functions of the following.
Stem tendril
State the functions of the following.
Stilt roots
Answer the following in short.
Give one example of modification of roots
Certain property is mentioned below. Find a leaf corresponding to the property and describe those plants.
Leaves with rough surface
Long Answer Type Question:
Explain an activity to test the presence of starch in a leaf.
Observe figure and attempt the questions that follow it.
- Label the parts 1, 2, 3 and 4 in the diagram.
- What type of venation does the leaf has?
- What type of venation is seen in grass leaves?
Observe the picture of an activity given as figure carried out with leaves of plants and polythene bag.
Now answer the following:
- Which process is demonstrated in the activity?
- When will this activity show better results on a bright sunny day or a cloudy day?
- What will you observe in the polythene bag after a few hours of setting up the activity?
- Mention any one precaution you must take while performing this activity.
