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B The anthers and stigmas on the same plant mature at the same time of year. The stomata close, cutting off transpiration and gas exchange. Stomata are the holes in plant leaves through which they transpire water. Explain the statement by giving example for each strategy. (i) State the colour of flower we would expect in their F1progeny. Plant cells lose a portion of their water content while the stomata are open, leaving the plant susceptible to dehydration. It is minute pore present in soft aerial parts of the plant. Most plants have such a distribution. Plants 'breathe' too, but they do it through tiny openings in leaves called stomata (singular: stoma). Leaves possess stomata – tiny pores, for gaseous exchange. A All of the flowers on the same plant have male and female reproductive organs. Figure 62. D. The xylem releases all its water. Consequently, leaves, stems and roots of plants separately exchange gases. C. The roots begin to rot, causing them to no longer uptake water. This adaptation helps cacti reduce water loss by keeping the hot, dry wind from blowing directly across the stomata. Many desert plants have very small stomata and fewer stomata than those of other plants. B. C There are separate male and female flowers on the same plant. The control of water loss by transpiration is, however, strikingly different in a xerophyte compared to a … Algae, fungi and submerged plants do not possess stomata. CAM plants such as cacti and Opuntia ficus–indica achieve their high water use efficiency by opening their stomata during the cool, desert nights and closing them during the hot, dry days. The Process of Respiration in Plants. A blue colour flower plant denoted by BB is crossbred with a white colour flower plant denoted by ww. Hence, each part nourishes and fulfils its own energy requirements. The plant begins absorbing oxygen and releasing carbon dioxide into the atmosphere. For the purposes of discussing plant pathology, only plant disease pathogens will be discussed. A. Q14. They are called plant pathogens when they infect plants. 26 During sexual reproduction in plants, what will give rise to the greatest variation in the offspring? Stomata was discovered by Pfeffer & name ‘stomata’ was given by Malphigii. Stomata cover 1-2% of leaf area. In many desert plants, stomata very often close during the hottest hours of the day when the cooling effect of transpiration would be most advantageous. Pathogens can spread from plant to plant and may infect all types of plant tissue including leaves, shoots, stems, crowns, roots, tubers, fruit, seeds and vascular tissues (Figure 62). Stomata can be distributed in the following ways on the two sides of a leaf: • An amphistomatous leaf has stomata on both surfaces. The stomata of many cacti lie deep in the plants’ tissues. • A hypostomatous leaf has stomata only on the lower surface. During respiration, in different plant parts, significantly less exchange of gas takes place. (a) Stomata are minute pores of eliptical shape, consists of two specialized epidermal cell called guard cells. Which of the following describes a phenomenon that occurs when we observe plants that wilt? A group of mostly desert plants called "CAM" plants (Crassulacean acid metabolism, after the family Crassulaceae, which includes the species in which the CAM process was first discovered) open their stomata at night (when water evaporates more slowly from leaves for a given degree of stomatal opening), use PEPcarboxylase to fix carbon dioxide and store the products in large vacuoles. Stomata open and close to allow the intake of carbon dioxide and the release of oxygen. Adaptation helps cacti reduce water loss by keeping the hot, dry wind from blowing across. 26 during sexual reproduction in plants, what will give rise to the greatest variation in the plants ’.! 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