Assertion: Etiolation is an energy conserving strategy in plants.
Reason: It helps plants growing in the dark reach the light before they die.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Photoperiodism (OLD NCERT) |
 61%

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The most important colors in regulating photomorhogenesis in plants are:
1. Violet and Yellow
2. White and Black
3. Green and Orange
4. Red and Blue

Subtopic:  Photoperiodism (OLD NCERT) |
 75%

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The biologically active form of the phytochrome is:
1.Pr
2. Pfr
3. Both
4. None

Subtopic:  Photoperiodism (OLD NCERT) |

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When lettuce seeds illuminated by red light are then exposed to far red light:

1. Pr is converted to Pfr and germination is inhibited
2. Pr is converted to Pfr and germination is initiated
3. Pfr is converted to Pr and germination is inhibited
4. Pfr is converted to Pr and germination is initiated

Subtopic:  Photoperiodism (OLD NCERT) |

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Etiolated seedlings become normal when exposed to:
1. Blue light
2. Green light
3. Red light
4. Far red light

Subtopic:  Photoperiodism (OLD NCERT) |
 54%

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An incandescent light bulb has a high output of red light. Which of the following plant process will be least promoted by it:
1. photosynthesis.
2. seed germination.
3. phototropism.
4. flowering.

Subtopic:  Photoperiodism (OLD NCERT) |

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Assertion: Auxin, produced predominantly in shoot tips, is transported from cell to cell down the stem and this is called as polar transport.
Reason: The polar transport is due to the gravitational forces.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Auxin Function |

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Assertion: If leaves removed from a plant are dipped in a cytokinin solution, they stay green much longer than otherwise:
Reason: Cytokinins have an anti-aging effect of certain plant organs like leaves.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Cytokinin |
 75%

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Assertion: The levels of ABA may increase 100-fold during seed maturation.
Reason: The high levels of ABA in maturing seeds inhibit germination.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Abscisic Acid |
 66%

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What is incorrect regarding the results of experiments conducted on coleoptiles of canary grass and oats by Charles Darwin and Francis Darwin on phototropism?
1. Both plants grow toward the light source.
2. The tips of coleoptiles were covered with a metal foil and the coleoptiles did not grow toward light.
3. When the metal foil was removed they still not grew toward the light.
4. The growing region of the coleoptiles rather than their tips was covered and the coleoptiles grew toward the light.

Subtopic:  Growth Hormones & Auxin |
 53%

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