Which of the following is a correct statement about mitochondria? MCQ with Answer and Explanation

Question
Which of the following is a correct statement about mitochondria?
A. They contain 80S ribosomes.
B. They are single-membrane organelles.
C. They are found in both prokaryotes and eukaryotes.
D. They have their own circular DNA.
Answer: Option D
Solution (By JKSSB Mock Tests)
Mitochondria are double-membrane organelles with circular DNA (like prokaryotes) and 70S ribosomes, supporting the endosymbiotic origin. They are absent in prokaryotes. They are the site of aerobic respiration. The matrix contains enzymes for Krebs cycle. The inner membrane forms cristae, housing electron transport chain and ATP synthase.
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Question #1
The blood vessel that carries deoxygenated blood from the upper body to the right atrium is the:
A. Superior vena cava
B. Aorta
C. Inferior vena cava
D. Pulmonary vein
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Correct Answer: Option A

Explanation:
The superior vena cava drains deoxygenated blood from the head, neck, arms, and upper thorax into the right atrium. The inferior vena cava drains the lower body. Pulmonary veins carry oxygenated blood, aorta carries oxygenated blood from left ventricle to body.
This question belongs to: Science Biology
Question #2
Assertion (A): Plants wilt in salty soil.
Reason (R): High salinity causes water to move out of root cells by osmosis.
A. A false, R true.
B. A true, R false.
C. Both A and R are true, but R is not the correct explanation.
D. Both A and R are true, and R is the correct explanation.
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Correct Answer: Option D

Explanation:
Saline soil has lower water potential, causing exosmosis from root cells, leading to plasmolysis and wilting. R correctly explains A.
This question belongs to: Science Biology
Question #3
The term 'biological magnification' refers to:
A. The increasing concentration of non-biodegradable toxic substances in organisms at higher trophic levels
B. The rapid growth of algae in nutrient-rich water bodies
C. The increase in the number of organisms at higher trophic levels
D. The increase in biodiversity in a climax community
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Correct Answer: Option A

Explanation:
Biological magnification (or biomagnification) is the process where the concentration of persistent, non-biodegradable toxic substances (like DDT, mercury, or PCBs) increases progressively at each successive trophic level in a food chain. Because these substances are not metabolized or excreted, they accumulate in the tissues of organisms. Top predators end up with the highest, often lethal, concentrations of these toxins.
This question belongs to: Science Biology
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