This adaptation helps cacti reduce water loss by keeping the hot, dry wind from blowing directly across the stomata. B The anthers and stigmas on the same plant mature at the same time of year. For the purposes of discussing plant pathology, only plant disease pathogens will be discussed. 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. A. 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. 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). Explain the statement by giving example for each strategy. A All of the flowers on the same plant have male and female reproductive organs. Q14. Hence, each part nourishes and fulfils its own energy requirements. (a) Stomata are minute pores of eliptical shape, consists of two specialized epidermal cell called guard cells. Plants 'breathe' too, but they do it through tiny openings in leaves called stomata (singular: stoma). During respiration, in different plant parts, significantly less exchange of gas takes place. Many desert plants have very small stomata and fewer stomata than those of other plants. Stomata was discovered by Pfeffer & name ‘stomata’ was given by Malphigii. The plant begins absorbing oxygen and releasing carbon dioxide into the atmosphere. 26 During sexual reproduction in plants, what will give rise to the greatest variation in the offspring? The stomata of many cacti lie deep in the plants’ tissues. C There are separate male and female flowers on the same plant. B. A blue colour flower plant denoted by BB is crossbred with a white colour flower plant denoted by ww. Which of the following describes a phenomenon that occurs when we observe plants that wilt? (i) State the colour of flower we would expect in their F1progeny. They are called plant pathogens when they infect plants. Stomata open and close to allow the intake of carbon dioxide and the release of oxygen. It is minute pore present in soft aerial parts of the plant. 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 close, cutting off transpiration and gas exchange. Consequently, leaves, stems and roots of plants separately exchange gases. D. The xylem releases all its water. Stomata cover 1-2% of leaf area. Plant cells lose a portion of their water content while the stomata are open, leaving the plant susceptible to dehydration. The Process of Respiration in Plants. 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 are the holes in plant leaves through which they transpire water. 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. C. The roots begin to rot, causing them to no longer uptake water. Figure 62. • A hypostomatous leaf has stomata only on the lower surface. Most plants have such a distribution. Leaves possess stomata – tiny pores, for gaseous exchange. Roots begin to rot, causing them to no longer uptake water has stomata only on the same of. 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