Water escapes in the form of sap from the injured part of the plant. (d) A plant in which the stomata are sunken. The ends of the cups were closed with corks through which two mercury manometers were connected. ❤❤ AS THE EVAPORATION WILL BE FASTER ON A HOT DAY.... ND DRY AND WINDY DAY. This water is conducted upwards through the stem and is distributed to all the aerial parts including the leaves. The entire apparatus is filled with water so that no air spaces are present. (d) After about half an hour what change, if any, would you expect to find in the cobalt chloride paper placed on the dorsal and ventral sides of the leaf? (d) Some desert plants have sunken stomata on their leaves. Transpiration will be fastest when the day is (a) cool, humid and windy (b) hot, humid and still (c) hot, humid and windy (d) hot, dry and windy. Take a small well-watered potted plant, preferably one with broad leaves. Transpiration will be fastest when the day is (a) cool, humid and windy (b) hot, humid and still (c) hot, humid and windy (d) hot, dry and windy . A tree loses more than 30 litres of water per day. There are more stomatal openings on the lower surface of a dorsiventral leaf and therefore, more transpiration occurs from the lower surface. (B) coated on the lower surface. The cells, therefore, lose turgidity. The pot is covered with a plastic sheet to prevent evaporation of water from the soil. (c) When the weight of the test tubes A and B is taken before and after the experiment, what change is observed? C.5.Differentiate between guttation and bleeding in plants. Some plants show wilting of their leaves at noon even when the soil is well watered. There are more stomatal openings on the undersurface of a dicot leaf and therefore, more transpiration occurs from the undersurface. Third fastest in the shade with no wind. At these temperatures the stomatal apertures or opening are generally widest. Potometer is an instrument used to find the rate of transpiration. It is the removal of water from the plant because of injury. Stomata are minute openings in the epidermal layer of leaves. Closing of stomata and shedding of leaves reduce transpiration. Other factors that affect transpiration include: (c) An instrument used to find the rate of transpiration. The amount of transpiration from lenticels certainly more than the cuticular transpiration, but very much less than the stomatal transpiration. The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. 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. Why? gallons of water every day through the process of transpiration, the evaporation of water ... where it joins the fast moving column of water or transpiration stream, headed to the leaves. (ii) Transpiration creates a pull for the upward movement of the sap. (a) Hydathodes and ……………………………… At 30°C, a leaf may transpire three times as fast as it does at 20°C. Light also speeds up transpiration by warming the leaf. (b) What is the purpose of putting oil in the test tube? Solution:-, (b) Leaf spines and……………………………… 2. More transpiration occurs from the lower surface of a dorsiventral leaf. Total loss of water by transpiration from single plant in one growing season = 1.89 li/day x 110 days = 207.9 li. A suitable control for this experiment is an empty polythene bag. In the evening or during the night, the stomata are constricted and the temperature is not high, therefore, there is no loss of water through transpiration and the turgidity of the leaves is re-acquired and they stand out erect. The purpose of keeping the test tube B in the experimental setup this makes the observation of the change in test tube A easy. The setup was kept in sunlight for two hours. 4. 2. Question A.8. Set-up A. Also on a cloudy day, the air is already dense with the water molecules and can not fill anymore. 8. (b) Hydathodes are similar to stomata in plant physiology. It also cause the stomata to open, thus more transpiration occurs during the day and the rate is higher on a sunny day compared to a cold dull day. 3. Droplets of water were then seen inside the bell jar. The purpose of putting oil in the test tube is to prevent the loss of water by evaporation. Answer the questions that follow: Transpiration is the process being studied. When there is a high rate of wind activity, transpiration is relatively higher since the moist or humid air around the plant is quickly replaced by less humid air allowing the plant to release even more water into the atmosphere. There are more stomatal openings on the undersurface of a dicot leaf and therefore, more transpiration occurs from the undersurface. 1. On a bright sunny day, the rate of transpiration is much higher than any other days. This increases the moisture in the atmosphere and brings more frequent rains. One of the internal factors which affect the rate of transpiration, is, (a) big size of the leaf (b) Colour of the leaf, (c) lower epidermis of leaves (d) hydathodes, 6. Differentiate between guttation and bleeding in plants. Suppose you have a small rose plant growing in a pot. Fastest transpiration rate in the sun with wind. Given below is the diagram of an apparatus used to study a particular phenomenon in plants: Name of the apparatus is Ganong’s potometer. (c) Why are glass slides placed over the dry cobalt chloride papers? It is known to be a part of the water cycle. Will you expect any difference in weight? (b) Explain the process named above in (a). (c) Yes, the transpiration rate will increase. These properties make them water-proof and hence they prevent transpiration. (b) Excessive transpiration results in the wilting of the leaves. 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