Select the incorrect statement/s from the following - (A) In human males, the testes are situated outside the abdominal cavity within a pouch. (B) Primary spermatocytes undergo mitosis to form secondary spermatocytes. (C) Sertoli cells provide nutrition to the germ cells. (D) Seminal plasma is rich in glucose, calcium, and certain enzymes. Choose the correct answer from the options given below:
(c) (B) only
Statement Analysis:
(A) In human males, the testes are situated outside the abdominal cavity within a pouch.
✅ Correct
The testes are located in the scrotum, a pouch outside the abdominal cavity, to maintain a temperature slightly lower than body temperature which is essential for sperm production.
(B) Primary spermatocytes undergo mitosis to form secondary spermatocytes.
❌ Incorrect
Primary spermatocytes actually undergo meiosis I to form secondary spermatocytes, not mitosis.
Mitosis occurs during the initial stage of spermatogonial division, not at this stage.
(C) Sertoli cells provide nutrition to the germ cells.
✅ Correct
Sertoli cells support and nourish developing sperm cells throughout spermatogenesis.
(D) Seminal plasma is rich in glucose, calcium, and certain enzymes.
✅ Correct
Seminal plasma contains nutrients like fructose (a sugar), calcium, enzymes, and other substances essential for sperm viability and motility.
Summary:
Incorrect statement is (B) only.
Important Questions from Human Reproduction
Arrange the following events chronologically as they occur during embryonic development:
- (A) Appearance of heart sounds
- (B) Development of limbs and digits
- (C) Formation of three primary germ layers
- (D) Separation of eyelids
Choose the correct answer from the options given below:
Which of the following hormone is generally not produced by the placenta?
In plants, continued self-pollination results in
Arrange the stages of oogenesis in order of their occurrence:
A. Formation of ovum & second polar body
B. Meiosis II begins but is held at Metaphase II
C. Meiosis I started but is held at Prophase I
D. Formation of primary oocyte from oogonia
E. Completion of Meiosis-I and formation of secondary oocyte and first polar body
Choose the correct answer from the options given below:
Signals of parturition originate from which of the following?
Human Placental Lactogen
Parturition hormone
Fully developed foetus
Placenta
