Reproduction An...

Common changes occur among boys and girls during puberty. A few of these have been listed below. Choose the incorrect one.

Assertion (A): Boys have a high pitched voice.
Reason (R): In boys, Adam's apple is prominent.

Statement 1: Girls need to take a lot of iron-rich food, especially during menstruation.
Statement 2: Iron is necessary for the formation of RBCs.

An adolescent boy's meal contains all essential nutrients, but no protein. The boy will exhibit

Which of the following statements is/are false?

a. The first occurrence of periods at puberty is called menarche.
b. Menstruation stops permanently when a women reaches the age of about 45 to 50 years.
c. The process of ovulation and menstruation in women is called menopause.

Given below are events that lead to pregnancy and development of an embryo:

(i) Fertilisation of egg
(ii) Maturation of egg
(iii) Release of egg
(iv) Embedding of embryo in thickened uterine wall

Which of the following options gives the correct order of their occurrence?

Complete the following sentences:

(a) In females, the uterine wall thickens to receive the __________.
(b) Endocrine glands release hormones directly into _______ for transportation to the target site.
(c) The sex hormones, ___________ and oestrogen, are responsible for the development of secondary sexual characters.
(d) Release of sex hormones is under the control of a hormone secreted from the __________.

Which of the following glands secrete products directly into the bloodstream?

a. Pituitary gland
b. Sebaceous gland
c. Thyroid gland
d. Sweat gland