The double fertilization characteristic of angiosperms results in the formation of: MCQ with Answer and Explanation

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The double fertilization characteristic of angiosperms results in the formation of:

A. Zygote and endosperm

B. Zygote and embryo sac

C. Two zygotes

D. Two embryos

Answer: Option A

Solution (By JKSSB Mock Tests)

Double fertilization involves one male gamete fusing with the egg cell to form a diploid zygote, and the second male gamete fusing with the two polar nuclei (central cell) to form a triploid primary endosperm nucleus. The endosperm provides nutrition to the developing embryo. This unique feature ensures efficient nutrient supply and is typical of angiosperms.

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Question #1

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Assertion (A): Humans are ureotelic.
Reason (R): The liver converts ammonia to urea, which is excreted in urine.

A. Both A and R are true, but R is not the correct explanation.

B. Both A and R are true, and R is the correct explanation.

C. A true, R false.

D. A false, R true.

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Correct Answer: Option B

Explanation:
Ammonia, toxic, is converted to less toxic urea in the liver via the urea cycle, then excreted by kidneys. Thus, humans excrete urea (ureotelic). R explains A.

This question belongs to: Science Biology

Question #2

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Consider the following statements about hormones:
1. Insulin is a peptide hormone.
2. Thyroxine is an amino acid derivative.
3. Cortisol is a steroid hormone.
Which of the above is/are correct?

A. 1 and 3 only

B. 1, 2, and 3

C. 2 and 3 only

D. 1 and 2 only

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Correct Answer: Option B

Explanation:
Insulin is a peptide, thyroxine derived from tyrosine, cortisol a steroid. All three classifications are correct.

This question belongs to: Science Biology

Question #3

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The process of artificially introducing weakened pathogens to stimulate immunity is called:

A. Antibiosis

B. Chemotherapy

C. Immunotherapy

D. Vaccination

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Correct Answer: Option D

Explanation:
Vaccination (immunization) involves administering killed or attenuated pathogens, or their antigens, to induce active artificial immunity without causing disease. It primes the immune system to produce memory cells. Antibiosis is inhibition by another organism, immunotherapy treats disease by modulating immune response, chemotherapy uses drugs against cancer or microbes.

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