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. Q14. B The anthers and stigmas on the same plant mature at the same time of year. It is minute pore present in soft aerial parts of the plant. B. C There are separate male and female flowers on the same plant. For the purposes of discussing plant pathology, only plant disease pathogens will be discussed. A All of the flowers on the same plant have male and female reproductive organs. Which of the following describes a phenomenon that occurs when we observe plants that wilt? Stomata open and close to allow the intake of carbon dioxide and the release of oxygen. Algae, fungi and submerged plants do not possess stomata. The control of water loss by transpiration is, however, strikingly different in a xerophyte compared to a … The Process of Respiration in Plants. (a) Stomata are minute pores of eliptical shape, consists of two specialized epidermal cell called guard cells. A. This adaptation helps cacti reduce water loss by keeping the hot, dry wind from blowing directly across the stomata. • A hypostomatous leaf has stomata only on the lower surface. Consequently, leaves, stems and roots of plants separately exchange gases. 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. Many desert plants have very small stomata and fewer stomata than those of other plants. D. The xylem releases all its water. Leaves possess stomata – tiny pores, for gaseous exchange. Stomata are the holes in plant leaves through which they transpire water. Plant cells lose a portion of their water content while the stomata are open, leaving the plant susceptible to dehydration. (i) State the colour of flower we would expect in their F1progeny. Stomata cover 1-2% of leaf area. Plants 'breathe' too, but they do it through tiny openings in leaves called stomata (singular: stoma). A blue colour flower plant denoted by BB is crossbred with a white colour flower plant denoted by ww. Stomata can be distributed in the following ways on the two sides of a leaf: • An amphistomatous leaf has stomata on both surfaces. Hence, each part nourishes and fulfils its own energy requirements. 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? Most plants have such a distribution. C. The roots begin to rot, causing them to no longer uptake water. Figure 62. Stomata was discovered by Pfeffer & name ‘stomata’ was given by Malphigii. 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). The stomata close, cutting off transpiration and gas exchange. 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. The stomata of many cacti lie deep in the plants’ tissues. Explain the statement by giving example for each strategy. The plant begins absorbing oxygen and releasing carbon dioxide into the atmosphere. During respiration, in different plant parts, significantly less exchange of gas takes place. 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