Plant Growth and Development NEET PYQs (1988–2026)

Solved Plant Growth and Development PYQs

3 recent questions with answers. The full set of 122 is free to practise.

1. NEET 2026MediumPhases of plant growth and growth rates
   Q1

   Since the origin and diversification of life on Earth, there have been five episodes of mass extinction of species. How is the sixth extinction, which is in progress, different from the previous episodes?

   • AThe present net species extinction rate is zero.
   • BThe current species extinction rate is nearly 10 times faster than in previous episodes.
   • CThe present species extinction rates are 100 to 1000 times faster than in the pre-human times.
   • DThe current species extinction rates are far lower than those in previous episodes.

   Show answer & solution

   Correct answer: (C)

   Current extinction rates are 100-1000 times faster than pre-human times.
2. NEET 2026HardAuxins
   Q2

   Match List-I with List-II:
   
   List-I (Growth Regulator):
   
   A. 2,4-D,
   
   B. GA₃,
   
   C. Kinetin,
   
   D. ABA
   
   List-II (Function/Effect):
   
   I. Brewing industry,
   
   II. Stimulation of stomatal closure,
   
   III. Herbicide,
   
   IV. Nutrient mobilisation
   
   Choose the correct answer from the options given below:

   • AA-III, B-I, C-IV, D-II
   • BA-IV, B-III, C-II, D-I
   • CA-I, B-IV, C-III, D-II
   • DA-I, B-II, C-IV, D-III

   Show answer & solution

   Correct answer: (A)

   2,4-D -- herbicide (III); GA₃ -- brewing (I); Kinetin – nutrient mobilisation (IV); ABA -- stomatal closure (II). So A-III, B-I, C-IV,
   
   D-II.
3. NEET 2026MediumEthylene and abscisic acid
   Q3

   Which of the following statements are correct regarding amino acids?
   
   A. They are substituted methanes.
   
   B. Serine is an aromatic amino acid.
   
   C. Valine is a neutral amino acid.
   
   D. Lysine is an acidic amino acid.
   
   Choose the correct answer from the options given below:

   • AC and D only
   • BB and C only
   • CA and C only
   • DA and B only

   Show answer & solution

   Correct answer: (C)

   A correct (α-amino acids are substituted methanes). B false (serine is not aromatic). C correct (valine is neutral). D false (lysine is basic).
   
   So A and C.

Topic-wise question count

Where NEET has asked from Plant Growth and Development, most frequent first.

• Auxins29
• Gibberellins and cytokinins26
• Ethylene and abscisic acid22
• Photoperiodism and vernalization20
• Seed dormancy, germination, and plant movements14
• Phases of plant growth and growth rates11

Year-wise Plant Growth and Development questions in NEET

Number of questions from this chapter in each year's paper(s).