What will be the sex of the child born :
(a) if X chromosome carrying sperm fuses with an egg cell carrying X chromosome ?
(b) if Y chromosome carrying sperm fertilises an ovum containing X chromosome ?
(a) Female (Girl) b) Male (Boy)
The sex of a child is determined by :
(a) the presence of an X chromosome in egg (or ovum).
(b) the presence of a Y chromosome in sperm.
(c) the age of father and mother.
(d) the length of the mother's pregnancy.
What will happen if the water in which tadpoles are growing does not contain sufficient iodine?
Name six endocrine glands in the human body. Also name the hormones secreted by each one of these glands.
Which of the following is a mis-matched pair ?
(a) adrenaline : pituitary gland (b) estrogen : ovary
(c) pancreas : insulin (d) testosterone : testis
State the main symptoms of goitre.
What is the legal age for the marriage of (a) boys, and (b) girls, in our country?
Which of the two has a shorter reproductive phase of life: men or women?