In a cymose inflorescence, the growth of the main axis is: MCQ with Answer and Explanation

In a cymose inflorescence, the growth of the main axis is:
A. Always forming a raceme
B. Continuous and terminates in a flower
C. Limited, ending in a flower, with lateral branches continuing growth
D. Restricted to the base of the plant
Answer: Option C
Solution (By JKExamLibrary)
In cymose inflorescence, the main floral axis has limited growth and terminates in a flower. Subsequent flowers are produced by lateral branches, which also terminate in flowers, creating a sympodial growth pattern. This is in contrast to racemose inflorescence, where the main axis continues to grow indefinitely (monopodial) and flowers are arranged in an acropetal or basipetal order.

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Practice More Biology Questions

Question #1
Assertion (A): ATP is the energy currency of the cell.
Reason (R): It stores energy in its high-energy phosphate bonds.
A. Both A and R are true, but R is not the correct explanation.
B. A true, R false.
C. Both A and R are true, and R is the correct explanation.
D. A false, R true.

Correct Answer: Option C


Explanation:
ATP has two high-energy anhydride bonds that release energy when hydrolyzed, driving cellular processes. R correctly explains A.

This question belongs to: Science Biology
Question #2
The protein in red blood cells that transports oxygen is:
A. Collagen
B. Fibrinogen
C. Insulin
D. Hemoglobin

Correct Answer: Option D


Explanation:
Hemoglobin is an iron-containing metalloprotein in erythrocytes that binds oxygen reversibly, forming oxyhemoglobin. Each molecule has four heme groups, each binding one O₂. Collagen is a structural protein, insulin a hormone, fibrinogen a clotting protein. Hemoglobin also carries some CO₂ and buffers blood pH.

This question belongs to: Science Biology
Question #3
The protein that forms the thick filaments in muscle sarcomeres is:
A. Troponin
B. Myosin
C. Actin
D. Tropomyosin

Correct Answer: Option B


Explanation:
Myosin is the motor protein forming thick filaments; its heads bind to actin thin filaments and generate force via the cross-bridge cycle. Actin forms thin filaments, troponin and tropomyosin regulate contraction. The sliding filament theory describes muscle shortening without filament length change.

This question belongs to: Science Biology