Stomata open and close to allow the intake of carbon dioxide and the release of oxygen. B. (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? C. The roots begin to rot, causing them to no longer uptake water. • A hypostomatous leaf has stomata only on the lower surface. D. The xylem releases all its water. During respiration, in different plant parts, significantly less exchange of gas takes place. A All of the flowers on the same plant have male and female reproductive organs. The stomata close, cutting off transpiration and gas exchange. A blue colour flower plant denoted by BB is crossbred with a white colour flower plant denoted by ww. Most plants have such a distribution. Q14. The Process of Respiration in Plants. 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. Plant cells lose a portion of their water content while the stomata are open, leaving the plant susceptible to dehydration. Plants 'breathe' too, but they do it through tiny openings in leaves called stomata (singular: stoma). 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. Explain the statement by giving example for each strategy. 26 During sexual reproduction in plants, what will give rise to the greatest variation in the offspring? (i) State the colour of flower we would expect in their F1progeny. 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 There are separate male and female flowers on the same plant. B The anthers and stigmas on the same plant mature at the same time of year. 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. Leaves possess stomata – tiny pores, for gaseous exchange. A. 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. 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