Transpiration is the process of water evaporating through stoma, or pores, in the foliage of plants. Throughout the day, as the sun shines on the bag, condensation will form and the water droplets will collect in the reservoir. After few hours, CaCl2 vials were taken out and weighed again. Transpiration refers to the movement of water through a plant and includes the uptake of water through its roots and the release of water through the stomata. Take a small well-watered potted plant, preferably one with broad leaves. The leaves of certain plants exhibit droplets of water along their margins in the morning. Therefore, more transpiration occurs during the day. 3. The leaf C shows the least limping. This particular happens in plants growing in warm humid conditions. The rest of it is almost lost to the atmosphere as water vapour as a result of transpiration. 5. (h) Loss of water as droplets from the margins of certain leaves. (a) Potometer is an instrument used for demonstration of transpiration occurring from the lower surface of a leaf. Other factors that affect transpiration include: Solution:-, Leaf spines and protection and reduced transpiration, (c) Lenticels and…………………………………. The amount of transpiration from lenticels certainly more than the cuticular transpiration, but very much less than the stomatal transpiration. The cells, therefore, lose turgidity. At night they are closed. Fill in the blanks with suitable terms given below: (Fast, Leaves, Stomata, Conducting, Ascent, Humid). At 30°C, a leaf may transpire three times as fast as it does at 20°C. Lenticels are special opening that develops on the barks of the older stem in place of stomata. Transpiration pull will be maximum under which set of the following conditions? Hydathodes are special pore-bearing structure present on the margins of the leaf to allow this exudation. force and in eliminating excess…………. Water is transported faster during daytime because rate of transpiration is higher during daytime. In general, the stomata close at temperatures about 0°C and progressively increase in aperture up to about 30°C (Devlin 1975). 1. Cuticular transpiration: Cuticle is an impermeable covering present on the leaves and stem. Water is taken into a plant through roots and root hairs by osmosis, and it exits the plant through ting openings on the underside of leaves known as stomata. The topics covered in this chapter are a demonstration of transpiration, measurement of transpiration, kinds of transpiration, factors that affect transpiration, adaptation in plants to reduce excessive transpiration, the significance of transpiration, direct loss of water by plants. When it is cloudy during the day, the stomata are partially closed and transpiration is reduced. Of the water given to a plant, 97 to 99.5% is lost to transpiration and guttation, a process where plants exude water droplets. Most of the transpiration in tall trees occurs through (a) Stomata (b) Lenticels (c) Cuticle (d) Bark. (b) Hydathodes are similar to stomata in plant physiology. Perspiration and transpiration help to cool the body temperature of the organism. Solution:-. If so, give reason. 2. A suitable control for this experiment is an empty polythene bag. (e) Mention two ways in which this process is beneficial to plants. Transpiration—the loss of water vapor to the atmosphere through stomata—is a passive process, meaning that metabolic energy in the form of ATP is not required for water movement.The energy driving transpiration is the difference in energy between the water in the soil and the water in the atmosphere. [This is done by lifting the bent capillary tube the coloured water so that air may be sucked in due to suction pull and is again dipped into the water.] (f) Any two parts of a leaf which allow transpiration. The blue colour of the cobalt chloride paper in the third bell jar (C) does not change at all and there are no water drops on the jar’s inner walls either. Solution:-. The readings on the capillary tube moves along. There are more stomatal openings on the lower surface of a dorsiventral leaf and therefore, more transpiration occurs from the lower surface. Download pdf of Class 10 in their respective links. Suppose you have a small rose plant growing in a pot. Second fastest in the sun, but no wind. Total loss of water by transpiration from single plant in one growing season = 1.89 li/day x 110 days = 207.9 li. Solution:-. Adaptations in plants to reduce excessive transpiration, Direct loss of water by plants – Guttation and Bleeding. So, excessive transpiration results in wilting of the leaves. After a few hours the weight of the CaCl2 vials will increase because they will absorb water lost by the leaf of the plant due to transpiration. As a result, there would be no movement of the air bubble and it would remain stable. Study the diagram and answer the following questions. Closing of stomata and shedding of leaves reduce transpiration. This particular happens in plants growing in warm humid conditions. Answer the questions that follow: Transpiration is the process being studied. The ends of the cups were closed with corks through which two mercury manometers were connected. The purpose of the spring balance in the set-up is to measure the change in weight of the set-up. 4. A tree loses more than 30 litres of water per day. (c)  What is the purpose of the spring balance in the set-up? (b) Oil is put on the surface of water to prevent loss of water by evaporation. Hence, the stoma from the diagram can be of a monocot leaf or of a dicot leaf. The paper may be pinned to a wooden stick or to a strip of cork sheet. Transpiration is the process is beneficial to plants. Selina Solutions Concise Biology Class 10 Chapter 5 Transpiration, is a very useful process for plants for two reasons, one creating suction force in the stem to enable the roots to absorb water and minerals nutrients, and two for cooling. (d) Some desert plants have sunken stomata on their leaves. 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