The type of muscle found only in the heart is: MCQ with Answer and Explanation

The type of muscle found only in the heart is:
A. Smooth muscle
B. Visceral muscle
C. Skeletal muscle
D. Cardiac muscle
Answer: Option D
Solution (By JKSSB Mock Tests)
Cardiac muscle is striated, branched, and involuntary, with intercalated discs containing gap junctions for synchronized contraction. It is unique to the heart wall. Smooth muscle is non-striated and involuntary in visceral organs, skeletal muscle is striated and voluntary. Cardiac muscle exhibits autorhythmicity.

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Practice More Biology Questions

Question #1
The hormone that stimulates the growth of the thyroid gland and secretion of thyroxine is:
A. Adrenocorticotropic hormone (ACTH)
B. Growth hormone (GH)
C. Thyroid-stimulating hormone (TSH)
D. Prolactin

Correct Answer: Option C


Explanation:
TSH, released from the anterior pituitary, binds to receptors on thyroid follicular cells, stimulating the synthesis and release of thyroxine (T₄) and triiodothyronine (T₃). TSH release is regulated by thyrotropin-releasing hormone (TRH) from the hypothalamus and feedback inhibition by thyroid hormones. ACTH stimulates adrenal cortex, GH growth, prolactin milk production.

This question belongs to: Science Biology
Question #2
In a cross between a homozygous dominant plant (TT) and a heterozygous plant (Tt), what proportion of the offspring will show the recessive phenotype?
A. 50%
B. 25%
C. 100%
D. 0%

Correct Answer: Option D


Explanation:
Cross: TT × Tt. Gametes: T (from TT) and T or t (from Tt). Offspring genotypes: TT and Tt. Both express the dominant phenotype because the recessive allele t is masked by T. No tt offspring are produced, so 0% show the recessive trait.

This question belongs to: Science Biology
Question #3
The organelle involved in lipid metabolism and detoxification is:
A. Golgi apparatus
B. Lysosome
C. Rough ER
D. Smooth ER

Correct Answer: Option D


Explanation:
Smooth endoplasmic reticulum (SER) lacks ribosomes and is involved in synthesis of lipids, steroid hormones, and detoxification of drugs and toxins via cytochrome P450 enzymes. Rough ER is for protein synthesis, Golgi for packaging, lysosomes for digestion. SER is abundant in liver and gonadal cells.

This question belongs to: Science Biology