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Free Embryonic Development MCQs with Answers

46 Embryonic Development MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.

Embryonic development begins after fertilization with cleavage and formation of the morula and blastula, followed by gastrulation and the establishment of germ layers. It includes organ formation, tissue differentiation and early growth, rather than the later increase in size associated with postnatal development.

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46 questions · page 1 of 3

1. If the fate of each blastomere is foretold then what will that cleavage be?

  • A. Spiral and indeterminate
  • B. Radial and determinate
  • C. Radial and indeterminate
  • D. Spiral and determinate

Explanation: Spiral cleavage means that the planes of cell division are diagonal to the vertical axis of the embryo.

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Correct answer: Spiral and determinate

2. In animals, a reproductive system developed from:

  • A. Ectoderm
  • B. Blastoderm
  • C. Mesoderm
  • D. Endoderm

Explanation: Mesoderm gives rise to muscular, skeletal, and reproductive systems.

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Correct answer: Mesoderm

3. In most triploblastic after embryonic development, the three layers are represented as?

  • A. Their functions in the body
  • B. Structures associated with them
  • C. Separate layers of cells
  • D. Structures formed from them

Explanation: Triploblasts are organisms whose body is derived from all three germ layers, which are the endoderm, mesoderm and ectoderm.

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Correct answer: Structures formed from them

4. Spiral and determinate cleavage is found in the embryo of:

  • A. Frog
  • B. Leech
  • C. Pigeon
  • D. Brittle star

Explanation: Explanation: Spiral cleavage is a type of embryonic development in which cells divide at oblique angles, resulting in a helical…

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Correct answer: Leech

5. In spermatophytes (seeded plants), the ploidy of embryo and the generation in which the embryo is produced is:

  • A. Option A
  • B. Option B
  • C. Option C
  • D. Option D

Explanation: In sporophytes, the embryo is diploid and produced in sporophyte generation.So option A is correct.

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Correct answer: Option A

6. One of the changes that would occur in an ovary of flowering plants after double fertilisation is that the

  • A. Pollen tube will disappear
  • B. Antipodal cells will double in number
  • C. Polar nuclei will form triploid endosperm
  • D. Egg cell will fuse with synergids to form diploid zygote

Explanation: In flowering plants, double fertilization involves two key events: one sperm cell fuses with the egg cell to form a diploid zygote, and…

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Correct answer: Polar nuclei will form triploid endosperm

7. In an experiment, a cell was isolated from an unknown embryo at four-cell stage and allowed to divide. Even after repeated divisions, this isolated cell did not develop into a complete animal.The embryo used in the above experiment could be of a:

  • A. Frog
  • B. Snail
  • C. Starfish
  • D. Sparrow

Explanation: The correct answer is starfish. In starfish, the embryo exhibits a mosaic development pattern.

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Correct answer: Starfish

8. The option which characterises apomixis in the flowering plants is

  • A. Option A
  • B. Option B
  • C. Option C
  • D. D

Explanation: In apomixis, meiosis is either skipped or modified, and the MMC or other cells within the ovule divide mitotically to produce a diploid…

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Correct answer: D

9. Following are some of the events that occur during the development of animals.The structures formed during the event X are

  • A. Somites
  • B. Blastomeres
  • C. Epiblast and hypoblast
  • D. Neural groove and neurocoel

Explanation: The correct answer is Option B: blastomeres. Blastomeres are the cells that result from the cleavage of the zygote, which is one of the…

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Correct answer: Blastomeres

10. A 16 weeks pregnant woman, who already has a son with haemophilia, visits a genetic counsellor to know about the genetic health of her second baby.The diagnostic test that the genetic counsellor refers to the woman would be:

  • A. Ultrasound
  • B. Gene therapy
  • C. Tissue culture
  • D. Amniocentesis

Explanation: The correct answer is amniocentesis. Amniocentesis is a diagnostic test typically performed between 15 and 20 weeks of pregnancy.

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Correct answer: Amniocentesis

11. Suppose a human egg is fertilised by a sperm. If, immediately after fertilisation,the zygote is divided into two separate cells, then this process would result in

  • A. Fragmentation
  • B. Fraternal twins
  • C. Identical twins
  • D. Parthenogenesis

Explanation: The correct answer is identical twins. When a single zygote divides into two separate cells after fertilization, it results in identical…

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Correct answer: Identical twins

12. In a chick embryo, somites are formed from

  • A. Dorsal mesoderm
  • B. Somatic mesoderm
  • C. Splanchnic mesoderm
  • D. Lateral plate mesoderm

Explanation: Somites in a chick embryo arise from the paraxial mesoderm, which is a part of the dorsal mesoderm.

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Correct answer: Dorsal mesoderm

13. In angiosperms, during the development of male gametophyte the generative cell divides and forms

  • A. Two tube nuclei
  • B. Four microspores
  • C. Two male gametes
  • D. Eight microspores

Explanation: In angiosperms, the development of the male gametophyte involves the formation of pollen grains, which contain two cells: a tube cell and…

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Correct answer: Two male gametes

14. The given diagram shows the experiment of embryonic induction performed by Spemann and Mangold.After analysing the result of experiment, the structure that was designated by Spemann asprimary organiser is the

  • A. Second neural plate in recipient's embryo
  • B. Dorsal blastopore lip area of donor's embryo
  • C. Mesoderm opposite to dorsal blastopore lip in donor's embryo
  • D. Mesoderm opposite to dorsal blastopore lip in recipient's embryo

Explanation: In Spemann and Mangold's experiment, the dorsal blastopore lip of the donor embryo was transplanted to the recipient embryo, leading to…

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Correct answer: Dorsal blastopore lip area of donor's embryo

15. A structure which is made up of both foetus and maternal tissue is known as:

  • A. Placenta
  • B. Umbilical cord
  • C. Amnion
  • D. Allantois

Explanation: The placenta is an organ that develops during pregnancy and is composed of both fetal and maternal tissue.

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Correct answer: Placenta

16. During human embryonic development, first site of RBC formation is

  • A. Yolk sac
  • B. Allantois
  • C. Notochord
  • D. Blastocyst

Explanation: In the human embryo, the first site of blood formation is the yolk sac.

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Correct answer: Yolk sac

17. Which one of the following events is likely to take place, if the nuclei from an 8- celled stage of an embryo are transplanted into enucleated eggs?

  • A. Recipient egg dies
  • B. Donor nuclei die in the new environment
  • C. Cleavage occurs but is arrested after some time
  • D. Formation of the viable embryo in the recipient eggs

Explanation: In the ideal scenario, the transplanted nuclei successfully integrate with the recipient egg's cytoplasm, leading to the formation of a…

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Correct answer: Formation of the viable embryo in the recipient eggs

18. The primary organizer during embryonic development:

  • A. Drives cell division during cleavage
  • B. Gives rise to extra embryonic tissues
  • C. Secretes signaling molecules to influence the fate of other cells
  • D. Folds inwards during gastrulation

Explanation: The primary organizer's role in initiating gastrulation is characterized by its ability to orchestrate the complex cellular movements that…

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Correct answer: Folds inwards during gastrulation

19. The extra-embryonic membrane which provides a fluid-filled environment for developing fetus is

  • A. Chorion
  • B. Allantois
  • C. Yolk sac
  • D. Amnion

Explanation: The amnion is an important extraembryonic membrane throughout development.

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Correct answer: Amnion

20. A structure established between the uterine and foetal tissues for the exchange of oxygen, carbon dioxide, waste, nutrients and other materials is:

  • A. Amnion
  • B. Placenta
  • C. Endometrium
  • D. Uterus

Explanation: The placenta is defined as temporary intimate mechanical and the physiological connection between foetus and maternal tissue for the…

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Correct answer: Placenta
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