Given below is the schematic representation of spermatogenesis in human males:
Choose the option that shows the correct labelling of ‘I’, ‘II’, ‘III’ and ‘IV’ in the given diagram.
Given below is the schematic representation of spermatogenesis in human males:
Choose the option that shows the correct labelling of ‘I’, ‘II’, ‘III’ and ‘IV’ in the given diagram.
Show Hint
- spermatozoa, spermatid, sec. spermatocyte, spermatogonia
- spermatid, spermatogonia, sec. spermatocyte, spermatozoa
- spermatogonia, sec. spermatocyte, spermatozoa, spermatid
- spermatogonia, sec. spermatocyte, spermatid, spermatozoa
The Correct Option is D
Solution and Explanation
Spermatogenesis and Labelling of Stages
Step 1: Understanding the Process of Spermatogenesis
Spermatogenesis is the process of sperm cell development in males, occurring in the seminiferous tubules of the testes. The key stages are:
- Spermatogonia: The primordial germ cells that divide by mitosis to form primary spermatocytes.
- Primary Spermatocytes: These undergo meiosis to form secondary spermatocytes.
- Secondary Spermatocytes: These undergo a second meiotic division to form spermatids.
- Spermatids: These undergo maturation (spermiogenesis) to become spermatozoa (mature, motile sperm cells).
Step 2: Analyzing the Diagram
The diagram below represents the stages of spermatogenesis. Based on the description:
- I represents spermatogonia, the undifferentiated germ cells that divide to produce primary spermatocytes.
- II represents secondary spermatocytes, which are produced after the first meiotic division of primary spermatocytes.
- III represents spermatids, which are formed after the second meiotic division of secondary spermatocytes.
- IV represents spermatozoa, the fully mature sperm cells after spermiogenesis.
Step 3: Conclusion
The correct labelling of 'I', 'II', 'III', and 'IV' in the diagram is: Option (D): Spermatogonia, Secondary Spermatocyte, Spermatid, Spermatozoa.
Questions Asked in CBSE CLASS XII exam
A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?
- CBSE CLASS XII - 2025
- Application of derivatives
- A meeting will be held only if all three members A, B and C are present. The probability that member A does not turn up is 0.10, member B does not turn up is 0.20 and member C does not turn up is 0.05. The probability of the meeting being cancelled is:
- CBSE CLASS XII - 2025
- Probability
- Vishesh, Manik and Amit were partners in the ratio 5 : 4 : 1. Amit retired on 31st March, 2024. Vishesh and Manik decided to share Amit’s share in the ratio 2 : 3. What will be the new profit sharing ratio between Vishesh and Manik?
- CBSE CLASS XII - 2025
- Retirement and Death of a Partner
- The electric field in a region is given by \( \vec{E} = 40x \hat{i} \, \text{N/C}. \) Find the amount of work done in taking a unit positive charge from a point (0, 3m) to the point (5m, 0).
- CBSE CLASS XII - 2025
- Electrostatics
- Consider the Linear Programming Problem, where the objective function \[ Z = x + 4y \] needs to be minimized subject to the following constraints: \[ 2x + y \geq 1000, \] \[ x + 2y \geq 800, \] \[ x \geq 0, \quad y \geq 0. \] Draw a neat graph of the feasible region and find the minimum value of $Z$.
- CBSE CLASS XII - 2025
- Linear Programming Problem