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Introduction:
The plant hormones can be defined as certain chemicals that are responsible for triggering some responses within the body of the plant. These hormones cause the response to gravity, light or touch. These hormones also give quick responses to stimuli.
Answer to Problem 1TY
The correct option is (c).auxin, cytokinin, gibberellin
Explanation of Solution
Explanation/justification for the correct answer:
The option is (c) auxin, cytokinin, gibberellin
The hormones auxins, cytokinins, and gibberellins are called plant hormones. Auxin is responsible for growth, cytokinins are responsible for cell division and gibberellins are responsible for stimulating cell division.
Explanation of incorrect answer:
Option (a) cyclic AMP, IP3 and calcium ions.
The ions cyclic AMP, IP3, and calcium ions are called as secondary messengers and are found in animal and plant cells. These are responsible for the transmission of messages from a different type of receptors and hormones. Hence option (a) is incorrect.
Option (b) calcium, CPDKs, and DELLA proteins
The calcium, CPDKs, and DELLA are called proteins. The CPDK called as effector, influences cellular response like closing and opening of ion channels. The protein DELLA is responsible for restricting the cell division process when gibberellin hormones are present. These are not hormones. Hence, option (b) is incorrect.
Option (d) chlorophyll, carotenoids, and phytochrome
Chlorophyll is the green pigment in a plant that helps in photosynthesis. Carotenoids are responsible for yellow, orange and red. Phytochromes are photoreceptors in plants that detect light. As these are not hormones, the answer is incorrect.
Option ( e) statoliths, pulvini, and parenchyma
Statoliths are plastids present in root cells. Pulvini help in response quick touch. The parenchyma tissue transfers oxygen into shoots and roots. As this is not hormones, option (e) is incorrect.
The major type of plant hormones includes auxin, cytokinins, and gibberellins hormones. Auxin helps in growth and the behavior of the plant. On the other hand, cytokinins and gibberellins and responsible for the promotion of cell division and aging and stimulation of cell division, elongation respectively. Hence, the option (c) is correct.
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Chapter 29 Solutions
Principles of Biology
- 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.arrow_forwardOn a hot, dry day a plant closes its stomata thereby conserving water. Which plant hormone is responsible for the closing of the stomata? ethylene abscisic acid cytokinin auxin gibberellinarrow_forwardProtects the plant and prevents it from drying out by means of a waxy Select match cuticle. Provides support and useful for food storage. -> Select match Thick walls allow them -> Select match to support the plant and also allow it to be flexible. The brain and spinal cord, which contains special cells called Select match neurones. Skeletal or striated Select match tissue connected to the skeleton to help with movement. Tissue found on the -> Select match surface of the skin.arrow_forward
- Which plant hormone mediates the seasonal abscission of fruits and leaves? gibberellin ethylene auxin abscisic acid cytokininarrow_forwardPlant Physiology Define or describe and give 2 functions of the plant tissue: Meristemarrow_forwardThe summer is not optimal for grape growing and you're searching in your memory for something regarding plant hormones. Explain 2 ways you could utilize plant hormones (choose from auxin, ethylene, cytokinin, gibberellin, abscisic acid, salicylic acid, jasonic acid) to compensate for a problem during growing. For each way:arrow_forward
- which is true regarding how auxin impacts bending of plants? auxin increases reversible bending (elasticity) auxin causes the increase of proteins that embed in between cellulose in the cell wall auxin travels to the sunny side of the stem to change growth auxin causes an increase in cell division that results in blending 2. Select all that are true regarding plant responses trophic responses are reversible, repeatable movements independent of the position of the stimulus venus fly trap responses are an example of a nastic movement phytochrome only enters the nucleus to change gene expression when in the active form (Pfr) shade or far red light converts the inactive phytochrome (Pr) to the active form (Pfr)arrow_forwardPlant Physiology Define or describe and give 2 functions of the plant tissue: Intercalary Meristemarrow_forwardPhytochrome, 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 genesarrow_forward
- What is the gravity receptor involved in gravitropism?arrow_forwardGreenhouse-grown tomato seedlings are often brushed by hand to simulate wind. This causes seedlings to grow slower, thicken stems, & resist mechanical wind damage when planted in the field. Which hormone is responsible? Auxin Salicylic acid Gibberellin Abscisic acid cytokinin Ethylenearrow_forwardWhich of the following is NOT a function of auxin? O Fruit ripening Retarding leaf abscission O Promoting the formation of lateral roots O Enhancing apical dominance Stem elongationarrow_forward
