The hormone that relaxes the pubic symphysis during childbirth is: MCQ with Answer and Explanation

The hormone that relaxes the pubic symphysis during childbirth is:
A. Progesterone
B. Relaxin
C. Oxytocin
D. Estrogen
Answer: Option B
Solution (By JKSSB Mock Tests)
Relaxin, produced by the corpus luteum and placenta, softens and relaxes the pelvic ligaments and pubic symphysis to facilitate childbirth. Oxytocin stimulates contractions.

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Practice More Biology Questions

Question #1
Ascorbic acid is the chemical name of:
A. Vitamin B₂
B. Vitamin D
C. Vitamin B₁₂
D. Vitamin C

Correct Answer: Option D


Explanation:
Vitamin C is chemically L-ascorbic acid. It is water-soluble, an antioxidant, and required for collagen synthesis. Deficiency causes scurvy. It is found in citrus fruits, amla, and green vegetables.

This question belongs to: Science Biology
Question #2
Consider statements about Mendel's laws: 1. The Law of Segregation applies to alleles of a single gene. 2. The Law of Independent Assortment applies to genes on the same chromosome. 3. Mendel worked on pea plants. Which are correct?
A. 1, 2 and 3
B. 1 and 3 only
C. 1 and 2 only
D. 2 and 3 only

Correct Answer: Option B


Explanation:
Mendel's Law of Segregation states that allele pairs separate during gamete formation, applying to a single gene. His Law of Independent Assortment applies to genes located on different (non-homologous) chromosomes, not those linked on the same chromosome. Mendel conducted his pioneering genetic experiments on the garden pea, Pisum sativum. Thus, statements 1 and 3 are correct.

This question belongs to: Science Biology
Question #3
The cell wall of fungi is composed of:
A. Peptidoglycan
B. Hemicellulose
C. Chitin
D. Cellulose

Correct Answer: Option C


Explanation:
Fungal cell walls contain chitin, a polymer of N-acetylglucosamine, which also forms the exoskeleton of arthropods. Plant cell walls are primarily cellulose, bacterial cell walls contain peptidoglycan (except Mycoplasma). Hemicellulose is a component of plant cell walls along with cellulose. Chitin provides structural strength and rigidity to fungi.

This question belongs to: Science Biology