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NEET UG Plant Growth and Development — practice questions — page 4

Explore 109 free Plant Growth and Development questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Plant Growth and Development questions and exercises with answers

Showing questions 91–109 of 109.

Kinetin was first discovered fromRead the answer and worked solution →The natural cytokinin isolated from corn kernels and coconut milk isRead the answer and worked solution →Cytokinins delay leaf senescence mainly byRead the answer and worked solution →Apical hook formation in dicot seedlings is induced byRead the answer and worked solution →The rise in respiration rate during ethylene-driven fruit ripening is calledRead the answer and worked solution →Rapid internode elongation that keeps deep water rice leaves above water is due toRead the answer and worked solution →The compound most widely used as a source of ethylene in agriculture isRead the answer and worked solution →Ethephon increases cucumber yield by promotingRead the answer and worked solution →Flowering in mango can be induced usingRead the answer and worked solution →Why is abscisic acid known as the stress hormone?Read the answer and worked solution →In most situations, abscisic acid acts as an antagonist toRead the answer and worked solution →By inducing seed dormancy, ABA mainly helps seeds toRead the answer and worked solution →Which plant hormones are the only steroid-based hormones in plants?Read the answer and worked solution →Brassinolide, the first brassinosteroid identified, was isolated from pollen ofRead the answer and worked solution →Lipid-based hormones first isolated from jasmine oil, important against herbivores, areRead the answer and worked solution →Which plant hormone is the precursor of the painkiller aspirin?Read the answer and worked solution →Besides aiding mycorrhizal fungi, strigolactones in plants inhibitRead the answer and worked solution →Ethylene in plants is formed from the breakdown of which amino acid?Read the answer and worked solution →Cytokinins help a plant overcome the apical dominance caused byRead the answer and worked solution →

Worked practice questions

Kinetin was first discovered from

  1. Human urine samples
  2. Corn kernel extract
  3. Fresh coconut milk
  4. Herring sperm DNA
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Correct answer: D. Herring sperm DNA

Kinetin, a modified adenine, was obtained from autoclaved herring sperm DNA and does not occur naturally in plants.

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The natural cytokinin isolated from corn kernels and coconut milk is

  1. Ethephon
  2. Kinetin
  3. Daminozide
  4. Zeatin
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Correct answer: D. Zeatin

The search for natural cytokinin-like substances led to zeatin from corn kernels and coconut milk.

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Cytokinins delay leaf senescence mainly by

  1. Promoting ethylene release
  2. Raising the respiration rate
  3. Promoting nutrient mobilisation
  4. Closing leaf stomata early
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Correct answer: C. Promoting nutrient mobilisation

Cytokinins draw nutrients into the leaf, and this mobilisation delays its senescence.

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