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- Although potato tuber is an underground plant part, it is considered asa stem. Give two reasons.In a practice known as crop rotation, farmers alternate a crop of legumes (plants like beans, whose roots bear nodules containing Rhizobium) with a crop of non- legumes. What is the benefit of this practice?What pharmaceuticals or chemical that can be derived from corn husks?
- In a microscopic field of Allium cepa root tip, how many number of cells undergo prophase, metaphase, anaphase, and telophase?A mesquite root is found penetrating a mine shaft about 150 feet below the surface of the soil. How might you determine when the root first grew into the shaft? (Hint: Mesquite is a woody plant.)Sometimes plants show etiolated growth pattern in order to get back to deetiolated growth. What is the possible reason for it?
- Compare and contrast semelparity and iteroparity. How does this differ from determinant and indeterminate growth?The following experiment was carreid out at ILC Laboratories to measure the effect of different nutrient solutions on bean root growth. Three nutrient solutions were made: 1.) A solution containing all required nutrients 2.) A solution containing all required nutrients except nitrogen; and 3.) distilled water. The results recorded for root length and leaf colour were as follows: Solution 1.) 47 mm; deep green Solution 2.) 17 mm; pale green-yellow Solution 3.) 14 mm; pale green-yellow a.) explain how the solution ranked in relation to the other two; b.) state the evidence that supports your answer; and c.) explain why the plant grew the way it didDescribe the effects of the following on photosythesis in the intact leaf a)leaf properties b)light c) tempereture d)carbondioxide
- How can one visually distinguish the areas of secondary growth from those of primary growth?Which of the following explains why pea plants in high soil nitrogen conditions have so few rhizobial nodules on their roots? When there is already high soil nitrogen there is a very large cost to having rhizobial nodules. The rhizobia bacteria in the nodules fix nitrogen when there isn't enough in the soil, so when there is already high soil nitrogen there is no advantage for the pea plant to expend the extra energy housing the rhizobia. The rhizobia bacteria in the nodules use nitrogen when there isn't enough in the soil, so in conditions of high soil nitrogen the plant tries to exclude the rhizobia to keep the nitrogen for itself. When there is already high soil nitrogen there is no benefit to the plant to having rhizobial nodules, which can rob the plant of the high nitrogen supplies so that the rhizobia bacteria do not have to fix the nitrogen themselves.Which of the following is not a way in which antifungaldrugs are effective?(a) They interfere with nucleic acid synthesis.(b) They increase plasma membrane permeability causingexcessive leakiness of essential substances.(c) They can impair the mitotic spindle apparatus.(d) They can induce mycorrhizae production.(e) None of the above