Biology - Human Reproduction Question with Solution | TestHub
Which of these developments occurs during the 1 trimester of pregnancy?
(A). Arms, hands, fingers, feet, toes are formed.
(B). Baby's movements can be easily felt by the mother.
(C). Foetus can open and close mouth and fists.
(D). The CNS is developing, working of the excretory and circulatory systems begins.
Choose thecorrectanswer from the options given below:
Options:
Answer:
Solution:
The first trimester of pregnancy corresponds to the first 12 weeks. Let us evaluate the given statements:
Statement (A) is correct. By the end of the second month of pregnancy, which is within the first trimester, the foetus develops limbs and digits, including arms, hands, fingers, feet, and toes.
Statement (B) is incorrect. The first movements of the foetus are typically felt by the mother during the fifth month, which falls in the second trimester.
Statement (C) is correct. By the end of the first trimester, most of the major organ systems are formed, and the foetus begins to show early reflex actions such as opening and closing fists and mouth.
Statement (D) is correct. The development of the central nervous system starts early in the first trimester, and the circulatory and excretory systems begin to function as major organ systems are established.
Therefore, statements (A), (C), and (D) represent developments during the first trimester.
Answer: (A), (C) and (D) only.
