Question

Question 2

B. Differentiate between the following pairs on the basis of what is given in the brackets: [5]
i. Tubectomy and Vasectomy (Part cut and tied)
ii. Rod cells and Cone cells (Pigment)
iii. Auxin and Cytokinin (Apical dominance)
iv. Ureter and Urethra (Function)
v. Fraternal and Identical twins (Process of formation)


Question 3

A. Answer the following questions in short : [5]
i. State two reasons for the increase of population in India.
ii. What happens to the uterus if fertilization fails to take place?
iii. What is Adrenal virilism?
iv. Why is circulation of blood in humans called as double circulation?
v. What is chordae tendinae?

B. Answer the following questions briefly: i. Which two hormones are secreted by the ovary? [2]
ii. State the function of the following: [2]
a. Seminal vesicle
b. Leydig cells
iii. How is the ‘LUB’ and ‘DUB’ sound produced in the heart? [1]


Question 4
[1] B. Give scientific reasons: [5]
i. We feel dizzy after spinning round and round.
ii. Insulin not given orally but injected into the body
iii. A potted plant kept in a dark room bends towards an open window.
iv. Blood flows under a great pressure through glomerulus.
v. Mature erythrocytes in humans lack mitochondria and nucleus.

Question 5 A.
i. Draw a well labelled diagram of the Human Ear. [2]
ii. Based on the diagram drawn above give suitable terms for each of the following: [3]
a. The part which transmits impulses to the brain.
b. Fluid present in the middle chamber of cochlea.



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c. The part which equalizes the atmospheric pressure and the pressure in the ear.

Question 6
A. Give the biological term / technical terms for the following : [5]
i. Statistical study of human population
ii. A fluid that occupies the larger cavity of the eyeball behind the lens
iii. One hormone secreted by the adrenal cortex
iv. Chest pain due to insufficient supply of blood to the heart muscles
v. The main natural auxin found in plants



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ii. What are the numbers of chromosomes present in the nucleus of the sperm? [1]
iii. Where is sperm produced? [1]
iv. In which part of the male reproductive system does it mature? [1]

B. Briefly explain the following terms : [5]
i. Sustainable development
ii. Synapse
iii. Tropic hormones
iv. Parthenocarpy
v. Micturition

Answer 1

A

i. india has low sex ratio as a female child is not well come in many families because of tertition. therefore female infanticide is precticed in some parts of the country