Read the paragraph and answer the Question given below:
Humans are sexually reproducing and viviparous. The male reproductive system is composed of a pair of testes the male sex accessory ducts and the accessory glands and external genitalia. The female reproductive system consists of a pair of ovaries a pair of oviducts, a uterus, a vagina, external genitalia and pair of mammary glands. The reproductive cycle of female primates is called menstrual cycle. Menstrual cycle starts only after attaining sexual maturation (puberty). Coitus followed by fertilization leads to formation of zygote. After 9 months of pregnancy, the fully developed foetus is ready for delivery.
What is the first sign of growing foetus?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Formation of heart
Option (1) Development of limbs and digits — Incorrect. The foetus develops limbs and digits by the end of the second month, a month after the heart has formed.
Option (2) Movement of foetus — Incorrect. The first movements of the foetus are usually seen during the fifth month, together with the appearance of hair on the head.
Option (3) Formation of heart — Correct. The heart forms after one month of pregnancy, and its sound is the first sign of the growing foetus.
Option (4) Development of head — Incorrect. The development of the head is not a sign that can be noticed from outside in early pregnancy. The heart sound, heard through a stethoscope, is.
Note: The passage is taken from NCERT. NTA has put lines of the NCERT text together to make it. Most CUET (UG) questions come straight from NCERT, so study the book line by line, including figures and their titles.
NCERT Extract:
Pregnancy and Embryonic Development – “… The human pregnancy lasts 9 months. … Find out. In human beings, after one month of pregnancy, the embryo’s heart is formed. The first sign of growing foetus may be noticed by listening to the heart sound carefully through the stethoscope.”