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Plant Growth and Development

Biology · Class 11 · CBSE

BiologyClass 11CBSEMedium
Q1/15
45s

Photoperiodism is the response of plants to:

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All 15 questions in this quiz

  1. Which of the following combinations is correctly matched?

    1. Auxin - Fruit ripening
    2. Ethylene - Fruit ripening
    3. ABA - Cell division
    4. Cytokinin - Dormancy induction

  2. Apical dominance is mainly controlled by:

    1. Cytokinin
    2. Auxin
    3. Ethylene
    4. Gibberellin

  3. Which factor is considered an internal factor affecting plant growth?

    1. Temperature
    2. Water availability
    3. Plant hormones
    4. Light intensity

  4. Which type of growth occurs throughout the life of most higher plants?

    1. Determinate growth
    2. Temporary growth
    3. Indeterminate growth
    4. Interrupted growth

  5. Which pigment is mainly responsible for sensing photoperiod in plants?

    1. Chlorophyll
    2. Xanthophyll
    3. Phytochrome
    4. Carotene

  6. Photoperiodism is the response of plants to:

    1. Soil pH
    2. Water availability
    3. Duration of light and darkness
    4. Wind speed

  7. Vernalization refers to:

    1. Growth in darkness
    2. Induction of flowering by low temperature
    3. Growth toward light
    4. Ripening of fruits

  8. The growth curve of plants under normal conditions is generally:

    1. Linear
    2. Zigzag
    3. Sigmoid (S-shaped)
    4. Circular

  9. Ethylene is unique among plant hormones because it is:

    1. Water soluble
    2. A gaseous hormone
    3. Produced only in roots
    4. Responsible only for root growth

  10. Which hormone is commonly known as the stress hormone of plants?

    1. Auxin
    2. Cytokinin
    3. Abscisic acid (ABA)
    4. Gibberellin

  11. Gibberellins are most commonly associated with:

    1. Closing of stomata
    2. Stem elongation and seed germination
    3. Fruit ripening
    4. Leaf fall

  12. Which hormone promotes cell division in plants?

    1. Gibberellin
    2. Cytokinin
    3. Ethylene
    4. Abscisic acid

  13. Which plant growth regulator is mainly responsible for cell elongation?

    1. Cytokinin
    2. Auxin
    3. Ethylene
    4. Abscisic acid

  14. The region of a root responsible for active cell division is:

    1. Region of maturation
    2. Region of elongation
    3. Apical meristem
    4. Root cap

  15. Which of the following best defines plant growth?

    1. Increase in the number of leaves only
    2. Irreversible increase in size and dry mass due to cell division and enlargement
    3. Temporary increase in water content of cells
    4. Formation of flowers only