Question

Choose the correct answers from the alternatives given.
During human gestation, organogenesis occurs

• A. in the first trimester
• B. in the second trimester
• C. in the third trimester
• D. during the blastocyst stage

Answer 1

The correct option is A in the first trimester

Organogenesis is the process by which the three germ tissue layers of the embryo, which are the ectoderm, endoderm, and mesoderm, develop into the internal organs of the organism. During the first trimester, fetus heart is formed (4th week), fetus limbs and digits are formed (8th week), most of the major organs and systems are developed (end of 12th week).

So the correct option is 'in the first trimester'.