Response in Plants

Question 3:Ethylene is a phytohormone that exists in the form of gas, is odourless and invisible.Phytohormones control the ripening of plants.(a) Mrs. Faridah placed an unripe key lime fruit together with a ripe banana in a closed container at room temperature.(i) Justify Mrs. Faridah’s decision to put both fruits in the same closed container.(ii) Predict … Read more

Question 1:Figure 1 shows an experiment to study the response of the shoot tip and root tip of a seedling towards sunlight.(a) Identify the response shown by the shoot tip and root tip towards light.(b) On Figure 1, draw what is observed on the tips of shoot and root after several days of exposure towards … Read more

Question 1:State one application for each of these phytohormones in the field of agriculture.(a) Gibberellin(b) Cytokinin(c) Auxin Answer:The use of phytohormones in agriculture:• Gibberellin promotes rapid elongation of flower stems.• Cytokinins promote cell division and differentiation in tissue culture technique.• Auxins produce seedless fruit via parthenocarpy. Question 2:Based on the statement below, what is hormone … Read more

Question 1:Name three examples of phytohormones and state their functions. Answer:Three phytohormones and their functions:• Auxin stimulates cell growth and elongation in roots and shoots.• Ethylene stimulates ripening in fruits.• Gibberellin stimulates the division and elongation in the stem cells. Question 2:How does auxin control shoot phototropism in the dark? Answer:In the dark, the auxin … Read more

Question 1:State the definition of tropism. Answer:Tropism is the responses of certain parts of a plant such as roots or shoots that respond towards or away from a stimulus. Question 2:List three types of tropism. Answer:Thigmotropism, hydrotropism, geotropism, chemotropism and phototropism. Question 3:Justify phototropism in plants. Answer:Positive phototropism ensures leaves get the optimum amount of … Read more