Which of the following may stimulate the growth of the roots in plant cuttings? Select one: a. The use of auxins. b. A decrease in soil minerals. c. A decrease in enzymes. d. The use of endocrine secretions.
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Which of the following may stimulate the growth of the roots in plant cuttings?
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- Root cells exhibit positive gravitropism with the help ofa. auxin in the root cells.b. amyloplasts in root cells.c. exposure to sunlight.d. a nearby substrate.Phytochrome is a plant pigment protein that: a. mediates plant infection b. promotes plant growth c. mediates morphological changes in response to red and far-red light d. inhibits plant growthWhat happens when a stem is positively tropic to a certain stimulus? a. Auxins will respond by increasing the growth rate of the side facing that stimulus.b. The stem will respond by growing towards that stimulus.c. The stem will grow and bend away from that stimulus.d. The stem will respond by accumulating auxins in the side facingthat stimulus.
- THree factors that affect plant growth are soil health, nitrogen fixation, and sunlight. Explsin how each factor works to effect the growth of plants.Pruning plants can promote lateral stems and increased plant biomass by _____________. Select one: a. suppressing cytokinin transport b. suppressing auxin transport c. promoting cytokinin transport d. promoting auxin transportWhich combination of hormones is best for promotingthe formation of lateral roots from pericycle?a. A high auxin level and low cytokinin levelb. A low auxin level and high cytokinin levelc. A high level of auxin and cytokinin
- . Which of the following is not a typical plant response when exposed to drought conditions? * A. Decreased leaf area B. Enhancement of root extension C. Stomatal opening due to decrease in ABA D. Osmotic adjustment through synthesis of compatible solutesWhich of the following statements about gravity perception is FALSE? A. Statoliths are specialized amyloplasts B. Statoliths are found in statocytes C. Gravity is sensed from the root cap acropetally through the zone of division D. Columella cells sense gravity through statolith pressure on the endoplasmic reticulum E. Auxin is the main hormone involved in gravity response. Which of the following is not a typical plant response to oxygen deficit due to flooding? * A. Aerenchyma formation B. Hyponastic growth of submerged leaves C. Stomatal closure D. Induction of anaerobic stress proteins
- Which of the following is/are false regarding the phloem? A. It transports starch from the leaves to the stem. B. It transports sucrose from the leaves to the roots. C. It is located lateral to the xylem in tree stems. D. Unlike the xylem, majority of the cells are living. E. A and D F. B and CWhich 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 leavesWhich of the following statements is false?a. Auxin and gibberellin promote stem elongation.b. Cytokinin triggers growth of lateral buds.c. Abscisic acid promotes water loss and dormancy.d. Ethylene promotes fruit ripening and abscission