Why is the colour of a leaf kept in the | Class 11 Biology Chapter Photosynthesis in Higher Plants, Photosynthesis in Higher Plants NCERT Solutions

Current NCERT chapter

Academic session 2026-27, Chapter 11 in the current curriculum.

Welcome to the NCERT Solutions for Class 11 Biology - Chapter Photosynthesis in Higher Plants. This page offers a step-by-step solution to the specific question from Exercise 1, Question 6: Why is the colour of a leaf kept in the dark frequently yellow, or pale green? Which pigment do you think is more stable?. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 6: Why is the colour of a leaf kept in the dark frequently yellow, or pale green? Which pigment do you think is more stable?
Answer:

Since leaves require light to perform photosynthesis, the colour of a leaf kept in the dark changes from a darker to a lighter shade of green. Sometimes, it also turns yellow. The production of the chlorophyll pigment essential for photosynthesis is directly proportional to the amount of light available. In the absence of light, the production of chlorophyll-a molecules stops and they get broken slowly. This changes the colour of the leaf gradually to light green. During this process, the xanthophyll and carotenoid pigments become predominant, causing the leaf to become yellow. These pigments are more stable as light is not essential for their production. They are always present in plants.

Study Tips for Answering NCERT Questions:

NCERT questions are designed to test your understanding of the concepts and theories discussed in the chapter. Here are some tips to help you answer NCERT questions effectively:

  • Read the question carefully and focus on the core concept being asked.
  • Reference examples and data from the chapter when answering questions about Photosynthesis in Higher Plants.
  • Review previous year question papers to get an idea of how such questions may be framed in exams.
  • Practice answering questions within the time limit to improve your speed and accuracy.
  • Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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Comments

  • Sai
  • Oct 09, 2019

Out standing

  • Himalayan Tenzin
  • Jun 10, 2016

Thank you for the valuable information. :)

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Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 6: Why is the colour of a leaf kept in the dark frequently yellow, or pale green? Which pigment do you ....

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