Plant Growth And Development Test 1: 16/11/12

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| By A_nagvenker
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A_nagvenker
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Quizzes Created: 3 | Total Attempts: 1,442
Questions: 10 | Attempts: 932

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Plant Quizzes & Trivia

Questions and Answers
  • 1. 

    Substances which originate at the tip of stem and control growth elsewhere are:

    • A.

      Vitamins

    • B.

      Enzymes

    • C.

      Food Materials

    • D.

      Phytohormones / Auxins

    Correct Answer
    D. Phytohormones / Auxins
    Explanation
    Phytohormones, also known as auxins, are substances that originate at the tip of the stem and control growth elsewhere in the plant. They play a crucial role in regulating various physiological processes such as cell elongation, root development, and fruit ripening. Auxins are responsible for phototropism, where plants bend towards a light source, and gravitropism, where plants grow in response to gravity. They are synthesized in the apical meristem of the stem and transported to other parts of the plant, where they regulate growth and development.

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  • 2. 

    Abscissic acid controls:

    • A.

      Shoot elongation

    • B.

      Cell elongation and cell wall formation

    • C.

      Cell division

    • D.

      Leaf fall and dormancy

    Correct Answer
    D. Leaf fall and dormancy
    Explanation
    Abscissic acid is a plant hormone that plays a crucial role in regulating leaf fall and dormancy. During the autumn season, abscissic acid levels increase in plants, causing the abscission zone to form at the base of the leaf stalk. This leads to the detachment of leaves from the plant. Additionally, abscissic acid promotes dormancy in plants, allowing them to conserve energy and survive unfavorable conditions such as winter or drought. Therefore, abscissic acid controls leaf fall and dormancy in plants.

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  • 3. 

    Cytokinin:

    • A.

      Is a hormone whose main function is the induction of cell division and delay in senescence

    • B.

      Is the process of cell division

    • C.

      Refers to cell movements

    • D.

      Causes dormancy

    Correct Answer
    A. Is a hormone whose main function is the induction of cell division and delay in senescence
    Explanation
    Cytokinin is a hormone that plays a crucial role in promoting cell division and delaying the aging process in plants. It stimulates the growth of new cells and helps in the development of tissues and organs. Additionally, cytokinin helps in preventing senescence, which is the natural deterioration and aging of cells and tissues. By delaying senescence, cytokinin helps plants maintain their vitality and overall health.

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  • 4. 

    Cell elongation in plants is caused by:

    • A.

      Auxin

    • B.

      Gibberellin

    • C.

      Florigen

    • D.

      Traumatin

    Correct Answer
    A. Auxin
    Explanation
    Auxin is a plant hormone that plays a crucial role in cell elongation. It promotes the growth of plant cells by increasing their size and stretching them. Auxin is primarily produced in the apical meristem and then transported to other parts of the plant, where it stimulates cell elongation. It acts by loosening the cell wall, allowing the cells to expand and elongate. Therefore, auxin is responsible for the process of cell elongation in plants.

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  • 5. 

    Gibberellin was first extracted from:

    • A.

      Gibberella fujikuroi or Fusarium moniliforme

    • B.

      Gelidium

    • C.

      Gracelaria

    • D.

      Aspergillus

    Correct Answer
    A. Gibberella fujikuroi or Fusarium moniliforme
    Explanation
    Gibberellin was first extracted from Gibberella fujikuroi or Fusarium moniliforme. These are both types of fungi that are known to produce gibberellins. Gibberellins are a group of plant hormones that play a crucial role in regulating plant growth and development. They are involved in various processes such as stem elongation, seed germination, and flowering. The extraction of gibberellins from these fungi allowed scientists to study and understand the function and effects of these hormones on plants.

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  • 6. 

    Genetic dwarfism can be overcome by the treatment of:

    • A.

      Gibberellins

    • B.

      Ethylene

    • C.

      Anti-gibberellin

    • D.

      Auxin

    Correct Answer
    A. Gibberellins
    Explanation
    Gibberellins can overcome genetic dwarfism. Gibberellins are a group of plant hormones that promote stem elongation and overall plant growth. In the case of genetic dwarfism, where the plant has a mutation that inhibits normal growth, the application of gibberellins can help stimulate growth and overcome the dwarfism phenotype. By promoting cell division and elongation, gibberellins can help the plant reach its full growth potential, compensating for the genetic mutation causing dwarfism.

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  • 7. 

    Which of the following is capable of delaying in senescence?

    • A.

      Cytokinins

    • B.

      Auxins

    • C.

      Gibberellins

    • D.

      Ascorbic acid

    Correct Answer
    A. Cytokinins
    Explanation
    Cytokinins are capable of delaying senescence. Senescence is the natural aging process of plants, where cells and tissues deteriorate over time. Cytokinins are a class of plant hormones that promote cell division and growth. They play a crucial role in regulating plant development and delaying senescence by inhibiting the breakdown of chlorophyll and promoting the production of proteins and other compounds that help maintain cell function and delay aging. Therefore, cytokinins can effectively delay senescence in plants.

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  • 8. 

    The ripening of fruits can be accelerated by:

    • A.

      Reducing the supply of water to plant when fruits are maturing

    • B.

      Increasing the supply of nitrogen to the atmosphere surrounding them

    • C.

      Warming up the surrounding artificially

    • D.

      Artificially adding ethylene gas to the atmosphere surrounding them

    Correct Answer
    D. Artificially adding ethylene gas to the atmosphere surrounding them
    Explanation
    Artificially adding ethylene gas to the atmosphere surrounding fruits can accelerate their ripening. Ethylene is a natural plant hormone that triggers various physiological processes, including fruit ripening. When ethylene gas is added to the environment, it stimulates the production of more ethylene within the fruit, which in turn speeds up the ripening process. This method is commonly used in the agriculture industry to control and synchronize the ripening of fruits, allowing for better harvesting and distribution practices.

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  • 9. 

    Pineapple can be made to flower in off season by:

    • A.

      Ethylene

    • B.

      Zeatin

    • C.

      Short days

    • D.

      Low temperature

    Correct Answer
    A. Ethylene
    Explanation
    Ethylene is a plant hormone that plays a crucial role in regulating the growth and development of plants. It is known to promote flowering in many plant species, including pineapple. Ethylene can induce flowering in pineapples by stimulating the production of a flower-inducing hormone called gibberellin. This hormone triggers the transition from vegetative growth to reproductive growth, leading to the formation of flowers. Therefore, the application of ethylene can effectively induce flowering in pineapples during the off-season when natural flowering may not occur.

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  • 10. 

    A well known naturally occuring auxin is:

    • A.

      2,4-D

    • B.

      Indole Acetic Acid

    • C.

      NAA

    • D.

      Maleic Hydrazide

    Correct Answer
    B. Indole Acetic Acid
    Explanation
    Indole Acetic Acid is a well-known naturally occurring auxin. Auxins are plant hormones that regulate plant growth and development. Indole Acetic Acid is produced in the apical meristem of plants and plays a crucial role in various physiological processes, including cell elongation, root initiation, and fruit development. It is commonly found in plant tissues and is involved in tropic responses, such as phototropism and gravitropism. Indole Acetic Acid is widely used in agriculture and horticulture for its ability to promote root formation and stimulate plant growth.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 16, 2012
    Quiz Created by
    A_nagvenker

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