Question

Consider the following statements
Assertion (A): Achyranthes shows spike inflorescence
Reason (R): Spike shows basipetal arrangement of sessile flowers

• A. Both (A) and (R) are true, (R) is the correct explanation of (A)
• B. Both (A) and (R) are true, (R) is not the correct explanation of (A)
• C. (A) is true, but (R) is false
• D. (A) is false, but (R) is true

Hint:

Remember: \textbf{Racemose = Acropetal succession} (old at base, young at tip) and \textbf{Cymose = Basipetal succession} (old at tip, young at base).
Spikes have sessile flowers along a common axis — a key identifying feature.
In Assertion–Reason questions, ensure the Reason correctly defines or explains the biological process in the Assertion.
Sketching a simple racemose vs. cymose inflorescence diagram can help you recall the direction of flower maturation quickly.

Answer 1

The Correct Option is C

1. In {Achyranthes} (family Amaranthaceae), flowers are borne on an elongated, unbranched axis without pedicels, forming a spike inflorescence. Hence, Assertion (A) is true.
2. In a spike, flowers are arranged directly on the main axis (rachis) and it belongs to the {racemose type} of inflorescence. In racemose inflorescences, the floral buds open in an acropetal order — the older flowers are at the base and the younger ones are towards the apex.
3. The Reason (R) states that the spike shows a basipetal arrangement of sessile flowers, which is incorrect because basipetal succession occurs in {cymose (determinate)} inflorescences, not in racemose ones like spikes.
4. Therefore, while the Assertion (A) is true, the Reason (R) is false. Hence, the correct answer is (3) (A) is true, but (R) is false.