Mention the most significant function of each of the following:

Islets of Langerhans 

Mention the most significant function of each of the following:

Bundle sheath

23.

State the most significant contribution of the following Scientists :

(i) Hans Berger   
(ii) Dixon and Jolly
(iii) J.B. Lamarck    
(iv) William Harvey

Write short notes on :

(i) Atavism

(ii) Protoplast fusion

(iii) Rh factor

Mention the chromosomal abnormalities concerned with the following conditions in humans:

(i) Turner’s Syndrome

(ii) Klinefelter’s Syndrome

(iii) Down’s Syndrome

a) Give any four anatomical difference between monocotyledonous and dicotyledonous leaf.

(b) Explain the phases of growth in meristem of plants.

(c) Draw a neat labelled diagram of a matured anatropous ovule before fertilization.

(a) Give an account of activity of cambium in the secondary growth of the stem.

(b) Write three differences between C3 and C4 cycles.

(c) Mention two advantages each of the following:

(i) Hydroponics (ii) Turgidity to plants (iii) Cross pollination

 (a) Explian the movement of water cell to cell across the root from the soil to the xylem.

(b) Draw a labelled diagram of T.S. of hyaline cartilage. Write a brief note on its functions.

(c) What is the full form of ADH ? How does ADH control osmoregulation in human kidney?.

(a) Explain the process of oogenesis in humans.

(b) State three differences between red muscle fibre and white muscle fibre.

(c) Mention a cause and symptom of each of the following:

(i) Amphysema (ii) Renal calculi (iii) Diarrhoea

(a)Describe the structure of an artery and vein. Explain how their structure helps in their functioning.

(b) Write three differences between short day and long day plants.

(c) Name the 2nd, 3nd and 8th cranial nerves in man and write a function of each.