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AIIMS UG Biology — practice by topic

Browse 101 questions across 6 Biology topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Biology topics

Cell Structure (54)Cell: The Unit of Life (54)Cell Biology (26)Human Reproduction (24)Molecular Basis of Inheritance (23)Biology (5)

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Each testis is divided into approximately how many compartments called testicular lobules?Read the answer and worked solution →Each seminiferous tubule is lined on its inside by two types of cells:Read the answer and worked solution →Leydig cells (interstitial cells) of the testis are responsible for:Read the answer and worked solution →The secretions constituting seminal plasma are rich in all of the following EXCEPT:Read the answer and worked solution →

Worked practice questions

Each testis is divided into approximately how many compartments called testicular lobules?

  1. 100
  2. 250
  3. 1000
  4. 50
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Correct answer: B. 250

Each testis contains about **250 testicular lobules**, each housing 1–3 highly coiled seminiferous tubules where sperms are produced.

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Each seminiferous tubule is lined on its inside by two types of cells:

  1. Primary spermatocytes and oocytes
  2. Leydig cells and Sertoli cells
  3. Spermatogonia and Leydig cells
  4. Spermatogonia and Sertoli cells
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Correct answer: D. Spermatogonia and Sertoli cells

Seminiferous tubules are lined by **spermatogonia (male germ cells)** that undergo meiosis to form sperms, and **Sertoli cells** that provide nutrition to the dividing germ cells. Leydig cells are in the *interstitial spaces* outside the tubules.

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Leydig cells (interstitial cells) of the testis are responsible for:

  1. Providing nutrition to germ cells
  2. Producing oxytocin
  3. Producing sperms
  4. Synthesising and secreting androgens (testicular hormones)
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Correct answer: D. Synthesising and secreting androgens (testicular hormones)

**Leydig cells** in the interstitial spaces synthesise and secrete **androgens** (testicular hormones) under LH stimulation. Sertoli cells nourish germ cells spermatogonia divide to form sperms.

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