Question

Given below are two statements:
Statement I: In general, a higher auxin to cytokinin ratio will induce root formation under in vitro culture conditions in plants.
Statement II: NAA is a cytokinin and BAP is an auxin.
In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement I and Statement II are correct.
• B. Both Statement I and Statement II are NOT correct.
• C. Statement I is correct but Statement II is not correct.
• D. Statement I is not correct but Statement II is correct.

Hint:

Remember: NAA is an auxin used to promote root development, while BAP is a cytokinin used for shoot induction.

Answer 1

The Correct Option is C

Step 1: Understand the hormonal control in plant tissue culture
In plant tissue culture, a high auxin-to-cytokinin ratio promotes root formation, whereas a high cytokinin-to-auxin ratio promotes shoot formation.

Step 2: Verify the accuracy of Statement I
Statement I is correct: A high auxin:cytokinin ratio is known to induce rooting under in vitro conditions.

Step 3: Analyze Statement II (hormone classification)
NAA (Naphthaleneacetic acid) is a synthetic auxin, not a cytokinin.
BAP (Benzylaminopurine) is a synthetic cytokinin, not an auxin.

Thus, Statement II is incorrect.