CSIR NET
   Top Resources
Rachana Chandil posted an Question
November 13, 2020 • 11:37 am 30 points
  • CSIR NET
  • Life Sciences

Given below are statements related to different aspects of plant growth and development. (a) leaf longevity is increased in ethylene-insensitive mutants etr 1-1

Given below are statements related to different aspects of plant growth and development. (A) Leaf longevity is increased in ethylene-insensitive mutants etr 1-1 and ein2 of Arabidopsis (B) Programmed cell death (PCD) is responsible for the formation of prickles, thorns and spines in plants. (C) Senescence and PCD occur only in the development of vegetative tissues and does not occur in reproductive tissues (D) Redifferentiation of organelles is an integral component during initial stages of senescence in plants. Which one of the following represents the combiation of all correct statements? (1) (A). (C) and (D) (3) (A), (B) and (D) (2) (B) and (C) (4) (C) and (A)

1 Answer(s) Answer Now
  • 0 Likes
  • 3 Comments
  • 0 Shares
  • comment-profile-img>
    Yogita Basnal best-answer

    Option 3 is correct. Leaf longevity is increased in ETR1 and EIN2 mutants because in those mutants EIN2 is unable to activate EIN3 to initiate leaf senescence. PCD is responsible for formation of prickles, thorns and spines which are basically used in defense. Redifferentiation has been observed in senescencing chloroplast and leafs. Only option C is incorrect because senescence and PCD occur in reproductive tissues as well.

whatsapp-btn

Do You Want Better RANK in Your Exam?

Start Your Preparations with Eduncle’s FREE Study Material

  • Updated Syllabus, Paper Pattern & Full Exam Details
  • Sample Theory of Most Important Topic
  • Model Test Paper with Detailed Solutions
  • Last 5 Years Question Papers & Answers

Sign Up to Download FREE Study Material Worth Rs. 500/-