The type of stem modification found in ginger is: MCQ with Answer and Explanation

The type of stem modification found in ginger is:
A. Corm
B. Bulb
C. Rhizome
D. Tuber
Answer: Option C
Solution (By JKExamLibrary)
Ginger is a rhizome, an underground modified stem growing horizontally, bearing nodes, internodes, scale leaves, and buds. Potato is a tuber, gladiolus a corm, onion a bulb (modified stem with fleshy leaf bases). Rhizomes store food and aid vegetative propagation.

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Question #1
The form of energy that directly powers the synthesis of ATP in chloroplasts is:
A. Light energy
B. Chemical energy of glucose
C. Proton gradient (chemiosmosis)
D. Electric current

Correct Answer: Option C


Explanation:
In both mitochondria and chloroplasts, ATP synthase uses the energy stored in a proton gradient across a membrane (thylakoid membrane in chloroplasts, inner mitochondrial membrane) to drive the synthesis of ATP from ADP and Pi. This process is chemiosmosis, proposed by Peter Mitchell.

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Question #2
The intestinal enzyme that converts trypsinogen to trypsin is:
A. Amylase
B. Lipase
C. Enterokinase
D. Nucleotidase

Correct Answer: Option C


Explanation:
Enterokinase (enteropeptidase), secreted by the duodenal mucosa, is the specific activator of pancreatic trypsinogen, converting it to active trypsin. Trypsin then activates other pancreatic zymogens (chymotrypsinogen, procarboxypeptidase). This cascade ensures that potent digestive enzymes are activated only in the intestinal lumen, preventing autodigestion of the pancreas.

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Question #3
In the human body, the 'Cerebellum' is a large structure located at the base of the brain. Its primary functions include:
A. Controlling emotions and memory
B. Processing visual and auditory information
C. Regulating heart rate and breathing
D. Coordinating voluntary movements, maintaining posture, and balance

Correct Answer: Option D


Explanation:
The cerebellum, meaning 'little brain', is a highly folded structure located at the posterior base of the skull, beneath the occipital lobes of the cerebrum and behind the brainstem. While it does not initiate movement, its primary functions are to coordinate voluntary motor movements, ensure muscle synergy, maintain posture, and regulate balance and equilibrium. It receives sensory input from the spinal cord, vestibular system, and cerebral cortex, and fine-tunes motor output to ensure smooth, accurate movements. Damage to the cerebellum results in ataxia (clumsy, uncoordinated movements).

This question belongs to: Science Biology