Hydathodes is the structure in a leaf that allows guttation. Hence a huge amount of water is escaped into the atmosphere by forests. The ends of the cups were closed with corks through which two mercury manometers were connected. To release the water into the capillary tube by opening the stop cock. Factors that affect the rate of transpiration also affect water uptake by the plant. Directly measuring the amount of water leaving the leaves through evaporation c. Directly measuring the amount of water absorbed … Can you explain this scientifically? As the stomata open during the daytime, the diffusion of gases in and out starts fulfilling the need for photosynthesis as well as allowing transpiration. (e) Cork and bark of trees help in preventing loss of water. (f) Perspiration and transpiration help to cool the body temperature of the organism. After completing all these processes, transpiration takes place. Stomata are minute openings in the epidermal layer of leaves. (i) Most transpiration occurs at midnight. Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants. A stomata is surround by two bean-shaped guard cells. Transpiration helps in creating suction force and in eliminating excess water. The. 5. (2003) provided that a single corn plant transpired almost 500 liters of water during a 4-month growing period. Light also speeds up transpiration by warming the leaf. The leaf C shows the least limping. More the, (e) Cork and Bark of trees are tissues of old woody stems. The root pressure generated by a plant assists in bleeding. Therefore, more transpiration occurs during the day. Solution:-(b) Lenticels. Leaves of some plants wilt during midday and recover in the evening. (d) A plant in which the stomata are sunken. Water is transported faster during daytime because rate of transpiration is higher during daytime. Throughout the day, as the sun shines on the bag, condensation will form and the water droplets will collect in the reservoir. Before the process of transpiration, there are a series of processes for a plant to undergo. The leaves of certain plants roll up on a bright day, in some cases, leaves may get wavy, rolled or folded to reduce exposed surface. It is known to be a part of the water cycle. Hence, the stoma from the diagram can be of a monocot leaf or of a dicot leaf. In some plants, e.g. ❤❤The rate of transpiration will be fastest when the day is hot,dry nd windy. Method: 1. Study the same and then answer the questions that follow: (a) Name the colour of dry cobalt chloride paper. This happens only due to injury. Adaptations in plants to reduce excessive transpiration, Direct loss of water by plants – Guttation and Bleeding. The third bell jar in this experiment is a control which proves that there was no moisture in the air due to transpiration as there was no plant in it. Ganong’s photometer is the apparatus to record the rate of transpiration in a cut shoot. The readings on the capillary tube moves along. Water escapes from specialized structures called hydathodes. (e) Most transpiration occurs during mid-day. In general, the stomata close at temperatures about 0°C and progressively increase in aperture up to about 30°C (Devlin 1975). In most plants, transpiration is a passive process largely controlled by the humidity of the atmospheric and the moisture content of the soil. High humidity in the air reduces the rate of outward diffusion of the internal water vapour across stomata, thereby reducing the rate of transpiration. Cuticular transpiration: Cuticle is an impermeable covering present on the leaves and stem. The setup was kept in sunlight for two hours. Wind Velocity: The velocity of wind greatly affects the rate of transpiration. (ii) During the day, the stomata are open to facilitate the inward diffusion of CO2 for photosynthesis. Due to the lower water pressure in the leaves and upper part of t… Required fields are marked *. In some plants, e.g. Of the transpired water passing through a plant only 1% is used in the growth process. 1. The purpose of the spring balance in the set-up is to measure the change in weight of the set-up. As to the maximum, Moore et al. Plant takes water, dissolved essential plant nutrients and minerals from the soil with the help of the roots through the process of osmosis. If so, give reason. (ii) Transpiration creates a pull for the upward movement of the sap. 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:-, Leaf spines and protection and reduced transpiration, (c) Lenticels and…………………………………. This builds up a big hydrostatic pressure within the plant and “forces out” the excess water directly from the tips of veins in the leaf. 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