Which of the following statements about viruses is INCORRECT?
A. They are obligate intracellular parasites.
B. They lack metabolic machinery.
C. They can have either DNA or RNA as genetic material.
D. They reproduce by binary fission.
Answer: Option D
Solution (By JKSSB Mock Tests)
Viruses do not reproduce by binary fission; they replicate by hijacking host cell machinery. Binary fission is a method of asexual reproduction in bacteria. All other statements are correct.
Consider the following statements regarding photosynthesis:
1. Light reactions occur in the thylakoid membranes.
2. Oxygen is released from carbon dioxide.
3. ATP and NADPH are produced in the light reactions.
Which of the above is/are correct?
Explanation:
Light reactions occur in thylakoid membranes, producing ATP, NADPH, and oxygen. Oxygen comes from water (photolysis), not CO₂. So statement 2 is incorrect. 1 and 3 are correct.
Explanation:
Thyroid-stimulating hormone (TSH), secreted by the anterior pituitary, binds to receptors on thyroid follicular cells and stimulates them to produce and release T₃ and T₄. ACTH stimulates adrenal cortex, FSH and LH target gonads.
Explanation:
The radicle is the embryonic root, and it is the first structure to emerge from the seed coat during germination, growing downward to anchor the plant and absorb water. The plumule becomes the shoot, hypocotyl connects radicle to cotyledons, cotyledons are seed leaves.
No comments yet. Be the first to start the discussion!