ICSE Class 10 Answered

(a)(i)

1. Lungs

2. Pulmonary artery

3. Pulmonary vein

4. Right ventricle

5. Left ventricle

6. Veins

7. Arteries

8. Blood capillaries

ii. Double circulation is a circulation in which the blood, before going

to the general circulation rounds the body, enters the heart twice, first as deoxygenated blood and then as oxygenated blood. The oxygenated blood goes to the general circulation.

iii. Relaxation phase of auricle and ventricle is known as diastole.

(b)

(i) 1. Monohybrid cross is the Mendelian cross in which only one pair

of contrasting characters is taken into consideration at a time.

2. Gene is a unit of heredity that determines particular traits.

Each gene is a segment of DNA.

3. Phenotype refers to the observable characters seen after a

successful cross genetically controlled.

ii. Two sex-linked diseases in males are baldness and hyperstrichory.

iii. Mendel's law of segregation stated that the two members of a pair of factors separate during the formation of gametes.