ICSE Class 10 Answered

(a)

(i) Amniocentesis.
(ii) Amniotic fluid.
(iii) This process is helpful in the pre-natal diagnosis of sex of the foetus.
(iv) This process establishes the sex of the foetus. Families with the desire to have only male child abort their baby in case they found the foetus is female.
(v) 1. Placenta; 2. Amniotic cavity; 3. Foetal cells; 4. Uterine wall.

(b)

(i) 1. Lacrimal Gland, 2. Duct of lacrimal gland, 3. Eyebrow, 4. Eyelid, 5. Lacrymal sac, 6. Nasolacrymal duct, 7. Iris, 8. Pupil, 9. Lower eyelid
(ii) Part 1 , Lacrimal gland produces tears.
     Part 2, Duct of lacrimal gland pours tears into the eye.
     Part 7, Iris regulates the size of the pupil.
(iii) In human beings both the eyes face forward this helps them to focus on the same object simultaneously. due to this, human can perceive  depth and the relative distance of the object giving the image a three dimensional effect.