CBSE 2025, Compartment, Set 1

Question

Which of the following statements are true in respect of chorionic villi in humans?
(i) It appears after implantation of human embryo in the uterus.
(ii) It becomes interdigitated with cervical tissue of female reproductive tract.
(iii) It increases the surface area for exchange of materials.
(iv) It develops from the inner cell mass of blastocyst. A). (i) and (ii) B). (ii) and (iii) C). (i) and (iv) D). (i) and (iii)

Edvaya · Accepted Answer

The correct answer is (i) and (iii). **SOLUTION** * **(i) True:** Chorionic villi are finger-like projections that appear on the trophoblast only *after* implantation. * *(ii) False:* They interdigitate with the *uterine tissue* (maternal blood), not the cervical tissue. * **(iii) True:** They significantly increase the surface area for the efficient exchange of nutrients, oxygen, and waste between mother and foetus. * *(iv) False:* They develop from the outer *trophoblast* layer, not the inner cell mass.

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Biology > Reproduction And Genetics > Human Reproduction

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