Which of the following diseases is caused by the bacterium Clostridium tetani? MCQ with Answer and Explanation

Question
Which of the following diseases is caused by the bacterium Clostridium tetani?
A. Botulism
B. Tetanus
C. Diphtheria
D. Pertussis (whooping cough)
Answer: Option B
Solution (By JKSSB Mock Tests)
Tetanus (lockjaw) is caused by the neurotoxin of Clostridium tetani, a soil bacterium that enters through wounds. The toxin causes muscle spasms and rigidity. Diphtheria is by Corynebacterium diphtheriae, pertussis by Bordetella pertussis, botulism by Clostridium botulinum (also a neurotoxin, but from food poisoning). Vaccination with DPT/tetanus toxoid prevents tetanus.
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Question #1
Which plant tissue is responsible for transport of organic nutrients?
A. Epidermis
B. Xylem
C. Phloem
D. Collenchyma
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Correct Answer: Option C

Explanation:
Phloem transports organic solutes (mainly sucrose) from source to sink. Xylem transports water and minerals. Phloem is composed of sieve tubes and companion cells.
This question belongs to: Science Biology
Question #2
The iron-containing protein in RBCs that transports oxygen is:
A. Myoglobin
B. Albumin
C. Hemoglobin
D. Collagen
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Correct Answer: Option C

Explanation:
Hemoglobin in red blood cells binds oxygen in the lungs and releases it in tissues. Each hemoglobin molecule can bind four O₂ molecules. It also carries some CO₂.
This question belongs to: Science Biology
Question #3
The largest and most diverse phylum in the animal kingdom is:
A. Arthropoda
B. Annelida
C. Mollusca
D. Chordata
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Correct Answer: Option A

Explanation:
Arthropoda is the largest phylum, with over a million described species, including insects, arachnids, crustaceans, and myriapods. They are characterized by jointed appendages, chitinous exoskeleton, and segmented bodies. Insects alone represent the majority of animal species. Chordata is comparatively smaller.
This question belongs to: Science Biology
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