Biology
The diagram shown below is the longitudinal section of a testis of man. Study it carefully and answer the questions that follow:
(i) Label the parts numbered 1 to 3 in the diagram.
(ii) In which part of the testis are the sperms produced?
(iii) State the functions of the parts labelled 1 and 3 in the diagram.
(iv) Name the cells that secrete Testosterone.
(v) Draw a neat, labelled diagram of a sperm.
Answer
(i) The parts numbered 1 to 3 are:
- 1 → Scrotum / Scrotal sac
- 2 → Sperm duct / Vas deferens
- 3 → Epididymis
(ii) Seminiferous tubules is the place where the sperms are produced.
(iii) The functions of the parts labelled 1 and 3 are:
- Scrotum (Part 1) — It is a thin-walled sac of skin that protects and surrounds the testes. It also maintains the temperature of testes at 2 to 3°C less than body temperature for the maturation of sperms.
- Epididymis (Part 3) — The epididymis stores the sperms for some days for maturation and transport it to vas deferens.
(iv) Interstitial cells or Leydig cells
(v) Labelled diagram of a sperm is shown below:
Related Questions
The diagrams given below represent the relationship between a mouse and a physiological process that occurs in green plants. Study the diagrams and answer the questions that follow:
(i) Name the physiological process occurring in the green plant that has kept the mouse alive.
(ii) Explain the physiological process mentioned above.
(iii) Why did the mouse die in bell jar B?
(iv) What is the significance of the process as stated in (i) for life on earth.
(v) Represent the above mentioned physiological process in the form of a chemical equation.
Give biological reasons for the following statements:
(i) Some women have facial hair like beard and moustache.
(ii) Cutting of trees should be discouraged.
(iii) In some xerophytes leaves are modified into spines.
(iv) There is frequent urination in winter than in summer.
(v) The left ventricle of the heart has a thicker wall than the right ventricle.
Mention the exact location of the following:
(i) Prostate gland
(ii) Myelin sheath
(iii) Islets of Langerhans
(iv) Semi-circular canals
(v) Eustachian tube
The diagram given below represents a section of the human heart. Answer the questions that follow:
(i) Which parts of heart are in the diastolic phase? Give a reason to support your answer.
(ii) Label the parts numbered 1 and 2 in the diagram. What type of blood flows through them?
(iii) What causes the heart sounds 'LUBB' and 'DUP'?
(iv) Name the blood vessels that supply oxygenated blood to the heart muscles.
(v) Draw neat labelled diagrams of a cross section of an artery and a vein.