The human ovum completes meiosis II at which stage? MCQ with Answer and Explanation

Question
The human ovum completes meiosis II at which stage?
A. At fertilization
B. During embryonic development
C. After fertilization, upon sperm entry
D. Before ovulation
Answer: Option C
Solution (By JKExamLibrary)
The secondary oocyte is arrested in metaphase II of meiosis and is ovulated. Meiosis II is completed only when a sperm penetrates the oocyte, producing a mature ovum and a second polar body. If fertilization does not occur, the secondary oocyte degenerates. This ensures that the egg is only fully mature upon fertilization.
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Question #1
The condition caused by vitamin D deficiency in adults is:
A. Kwashiorkor
B. Osteomalacia
C. Rickets
D. Scurvy
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Correct Answer: Option B

Explanation:
Osteomalacia is softening of bones in adults due to vitamin D deficiency, leading to bone pain and muscle weakness. Rickets is the childhood equivalent, affecting growth plates. Scurvy is vitamin C deficiency, kwashiorkor is protein deficiency. Vitamin D is essential for calcium absorption and bone mineralization.
This question belongs to: Science Biology
Question #2
The tissue responsible for the transport of water in plants is:
A. Phloem
B. Collenchyma
C. Epidermis
D. Xylem
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Correct Answer: Option D

Explanation:
Xylem is a complex permanent tissue that conducts water and dissolved minerals from roots to the aerial parts. It consists of tracheids, vessels, xylem parenchyma, and fibers. Phloem transports organic solutes, collenchyma provides flexible support, epidermis protects.
This question belongs to: Science Biology
Question #3
Identify the correct statement about the human reproductive system:
A. The vas deferens carries sperm from the testes to the urethra.
B. Fertilization occurs in the ovary.
C. The prostate gland produces sperm.
D. The ovum is released from the uterus during ovulation.
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Correct Answer: Option A

Explanation:
Vas deferens transports sperm. The ovum is released from the ovary, fertilization occurs in the fallopian tube, prostate produces seminal fluid.
This question belongs to: Science Biology
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