Description : Fruit and leaf drop at early stages can be prevented by the application of (a) ethylene (b) auxins (c) gibberellic acid (d) cytokinins.
Last Answer : (b) auxins
Description : Leaf fall can be prevented with the help of (a) abscisic acid (b) auxins (c) florigen (d) cytokinins.
Last Answer : (d) cytokinins.
Description : Cut or excised leaves remain green for long if induced to root or dipped in (a) gibberellins (b) cytokinins (c) auxins (d) ethylene.
Last Answer : (b) cytokinins
Description : Consider the following pairs Plant hormone Function/Effect 1. Indole-3 acetic acid - Rooting in cuttings 2. Gibberellic acid - Stomatal closure 3. Ethylene - Fruit ripening 4. Zeatin - Cell division Which of the above pairs are correctly matched ... 3 (b) 1, 2, and 4 (c) 2 and 4 (d) 1, 2, 3, and 4
Last Answer : Ans:(b)
Description : Parthenocarpic tomato fruits can be producedby (a) treating the plants with phenylmercuric acetate (b) removing androecium of flowers before pollen grains are released (c) treating the plants with low concentrations of gibberellic acid and auxins (d) raising the plants from vernalized seeds
Last Answer : (c) treating the plants with low concentrations of gibberellic acid and auxins
Description : Which of the following plant hormones are incorrectly paired? (1) abscisic acid- transpiration (2) auxins-apical dominance (3) cytokinins- senescence (4) gibberlins- bud and seed dormancy
Last Answer : gibberlins- bud and seed dormancy
Description : Many _________ in super optimal concentrations also act as growth inhibitors : a. Auxins b. Gibberellins c. Cytokinins d. All of above
Last Answer : Auxins
Description : Plants, protein, RNA, DNA contents are increased by a. Auxins b. Adenine c. Cytokinins d. None of above
Last Answer : Cytokinins
Description : Hormones which control apical dominance are: a. Auxins b. Cytokinins c. Gibberellins d. Polyamines
Description : Leaf senescence can be retarded by the application of : a. Auxins b. Gibberellins c. Kinins d. Abscicic acid
Last Answer : Kinins
Description : Which of the following plant hormone was first isolated from a fungus? (a) Ethylene (b) Gibberellic acid (c) Kinetin (d) Zeatin
Description : Seed dormancy is regulatedby – (1) Abscisic acid (2) Gibberellic acid (3) Indole acetic acid (4) Ethylene
Last Answer : (1) Abscisic acid Explanation: The transition from dormancy to germination in seeds is a key physiological process during the lifecycle of plants. Abscisic acid (ABA) is the sole plant ... acts through a gene expression network involving the transcription factor ABSCISIC ACID INSENSITIVE 3 (ABI3).
Description : Seed dormancy is regulatedby (1) Abscisic acid (2) Gibberellic acid (3) Indole acetic acid (4) Ethylene
Last Answer : Abscisic acid
Description : A plant hormone used for inducing morphogenesis in plant tissue culture is (a) cytokinins (b) ethylene (c) abscisic acid (d) gibberellins.
Last Answer : (a) cytokinins
Description : Cell elongation in internodal regions of the green plants takes place due to (a) indole acetic acid (b) cytokinins (c) gibberellins (d) ethylene
Last Answer : (c) gibberellins
Description : Auxins have effective role in : a. Delay in flower opening b. Cell division c. Reduction of pre harvest fruit drop d. All of the above
Last Answer : Reduction of pre harvest fruit drop
Description : Which one of the following pairs, is not correctly matched? (a) Gibberellic acid - Leaf fall (b) Cytokinin - Cell division (c) IAA - Cell wall elongation (d) Abscissic acid - Stomatal closure
Last Answer : (a) Gibberellic acid - Leaf fall
Description : The following is not a plant growth regulator a) Acetic acid b) Auxins c) Gibberellins d) Ethylene
Last Answer : a) Acetic acid
Description : Phosphatic fertilisers (A) Are useful during early stage of the plant growth (B) Accelerate fruit formation in later stages of growth (C) Lessen the effect of excessive nitrogen application (D) None of these
Last Answer : (B) Accelerate fruit formation in later stages of growth
Description : Which of the following is controlled by Gibberellic Acid? a. Prevention of the loss of flowers b. Vegetative Growth c. Ripening of fruits d. Fruit fall
Last Answer : d. Fruit fall
Description : Which of the following statements are true? 1. Cytokinins promote stomatal opening 2. Sprays of indole -3 acetic acid can inhibit premature fruit fall 3. The growth movements caused by a unilateral stimulus are known as nastic movements 4. The ... 4 (b) 2 and 4 (c) 1, 2, and 4 (d) 1, 2, 3, and 4
Last Answer : Ans:(a)
Description : Farmers in a particular region were concerned that pre-mature yellowing of leaves of a pulse crop might cause decrease in the yield. Which treatment could be most beneficial to obtain maximum ... yellow leaves and spraying the remaining green leaves with 2, 4, 5-trichlorophenoxy acetic acid
Last Answer : (a) Application of iron and magnesium to promote synthesis of chlorophyll
Description : Which of the following control the root initiation, cell elongation and apical dominance? (A)Auxins (B) ABA (C) Gibberellins (D) Ethylene
Last Answer : (D) Ethylene
Last Answer : (B) ABA
Description : Rootex contains a) Auxins b) ABA c) Kinetin d) Ethylene
Last Answer : a) Auxins
Description : Antagonistic effect of Fe on Zn availability in sweet orange causes: a. Leaf drop b. Fruit drop c. Reduce fruit weigh d. Zn deficiency
Last Answer : Zn deficiency
Description : Excess of N in citrus plant may cause a. Leaf drop b. Lodging c. Flower drop d. Fruit drop
Last Answer : Flower drop
Description : Which model is used during early stages of the system design afterthe requirements have been established? a) An application-composition model b) A post-architecture model c) A reuse model d) An early design model
Last Answer : d) An early design model
Description : If a dwarf pea plant was treated with gibberellic acid, it became as tall, as tall pea plants. If these pea plants are crossed with pure tall pea plants, what will be the phenotypic ratio in F1 generation? ... (b) 50% tall and 50% dwarf plants (c) 75% tall and 25% dwarf plants (d) 100% tall plants
Last Answer : Ans. ((d))
Description : Hormone primarily connected with cell division is (a) IAA (b) NAA (c) cytokinin/zeatin (d) gibberellic acid.
Last Answer : (c) cytokinin/zeatin
Description : Gibberellic acid induces flowering (a) in short day plants under long day conditions (b) in day-neutral plants under dark conditions (c) in some gymnospermic plants only (d) in long day plants under short day conditions
Last Answer : (d) in long day plants under short day conditions.
Description : Dwarfness can be controlled by treating the plant with (a) cytokinin (b) gibberellic acid (c) auxin (d) anti-gibberellin.
Last Answer : (b) gibberellic acid
Description : Which one of the following acids is a derivative of carotenoids? (a) Indole-3-acetic acid (b) Gibberellic acid (c) Abscisic acid (d) Indole butyric acid
Last Answer : (c) Abscisic acid
Description : Which of the following is not an inhibitory substance governing seed dormancy? (a) Gibberellic acid (b) Abscisic acid (c) Phenolic acid (d) Para-ascorbic acid
Last Answer : a) Gibberellic acid
Description : Why do my apple trees drop their fruit early and green?
Last Answer : Need Answer
Description : Fruit stored in a cold chamber exhibit longer storage life because – a. exposure to sunlight is prevented b. the concentration of carbon dioxide in the environment is increased c. the rate of respiration is decreased d. there is increase in humidity
Last Answer : c. the rate of respiration is decreased
Description : Which of the following plant hormones are incorrectly paired? (1) abscisic acid- transpiration (2) auxins- apical dominance (3) cytoldnins- senescence (4) gibberlins- bud and seed dormancy
Last Answer : (4) gibberlins- bud and seed dormancy Explanation: Abscisic acid is responsible for responsible for dormancy of various types. It maintains dormancy in seeds and buds, stimulates the closing of stomata. Gibberellins are responsible for cell division and growth in cell size.
Description : Nitrogenous fertiliser is required (A) During the early stage of growth to promote development of stem andleaves (B) For accelerating fruit formation in later stage of growth (C) To lessen the effect of excessive potash application (D) None of these
Last Answer : (A) During the early stage of growth to promote development of stem andleaves
Description : Absorption factor method is used to calculate the number of ideal stages, when (A) Operating line lies above the equilibrium line (B) Operating line lies below the equilibrium line (C) Both operating and equilibrium lines are parallel (D) Pressure drop in the column is very high
Last Answer : (C) Both operating and equilibrium lines are parallel
Description : Pick out the correct statement. (A) Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of ... Flash distillation is suitable for separating components which have very close boiling temperature
Last Answer : (A) Ponchan-Savarit method is more accurate than McCabe-Thiele method to determine the number of theoretical stages required for the separation of nonideal binary system by distillation
Description : Who discovered cytokinins? -Biology
Last Answer : answer:
Description : Commercial applications of cytokinins -Biology
Description : Callus is induced to form roots in the medium of (a) Auxin (b) Cytokinins only (c) Morecytokinins than auxin (d) Moreauxin than cytokinins
Last Answer : (d) Moreauxin than cytokinins
Description : Phototropic and geotropic movements are linked to (a) gibberellins (b) enzymes (c) auxin (d) cytokinins.
Last Answer : (c) auxin
Description : Cytokinins (a) promote abscission (b) influence water movement (c) help retain chlorophyll (d) inhibit protoplasmic streaming.
Last Answer : (c) help retain chlorophyll
Description : Phototropic curvature is the result of uneven distribution of (a) gibberellin (b) phytochrome (c) cytokinins (d) auxin.
Last Answer : (d) auxin.
Description : How does ethylene ripen fruit? -Biology