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- Which of the following statements is false? a. Auxin and gibberellin promote stem elongation b. Cytokinin promotes cell division in shoot tips c. Abscisic acid promotes water loss and dormancy d. Ethylene promotes fruit ripening and abscission.Which plant hormone plays key role to switch the plant development from seed dormancy to seed germination? How this plant hormone promotes germination?How would plant development change if the functions of the genes SHOOTMERISTEMLESS (STM) and MONOPTEROUS (MP) were reversed? a. The embryo–suspensor axis would be reversed. b. The embryo–suspensor axis would be duplicated. c. The root–shoot axis would be reversed. d. The root–shoot axis would be duplicated.
- Which of the following is the role of iron in plants? A. endosperm development and dehydrogenase activity B. photodestruction of chlorophyll and chloroplast structure C. energy transferring process for photosynthesis and respiration D. regulatory component of proteins and metabolites in roots and leavesWhy is it that even if you put the newly germinated seed in an inverse position (roots above), the roots will find its way back to the ground?Many flowers have both anthers and pistils. What prevents self-pollination and later self-fertilization?
- Why can a monocot like an iris branch and increase its number of leaves? Is the fact that the shoot is a rhizome with adventitious roots important? Is water transported from one end of the shoot to the other?Why did plant physiologists propose the existence of a mobile molecule(florigen) that triggers flowering?list six important types of plant hormones?
- Which option is TRUE regarding endosperm in monocots? Endosperm consists mainly of glucose and water. Endosperm matures into a fruit. Endosperm is consumed by the embryo as the seed develops. Endosperm is largely unused as the seed develops. Endosperm is transferred to the cotyledons.Some plant hormones oppose the effect of each other. Auxins and cytokinins for example. Whereas auxins prevent shoots from branching, cytokinins promote the development of branches. What other hormones also exhibit such opposing effects? Explain your answer briefly.Phytochrome, plays an important role in flowering in many plants. It can also be used to determine when lettuce seeds germinate (shown in the figure below What is phytochrome likely doing in the lettuce seeds? Activating abscisic acid production Activating inhibitors of germination Inhibiting gibberellin synthesis Turning on germination-related genes