Biology

Embryonic Development

621 Questions

Embryonic development questions cover the biological processes of gamete fusion, germ layer formation, and fetal maturation. The focus lies in identifying extraembryonic structures, trophoblast functions, and sequential developmental stages. This specialized topic appears regularly in biology screening tests and medical entrance examinations.

Germ layer formationBlastocyst implantationExtraembryonic structuresFetal development stagesReproductive physiology

Embryonic Development Questions

Multiple choice

Match list I (Region) with list II (Contribution to) and select the correct answer using the codes given below the lists:

List I List II
A. Apical cell of 2-celled embryo 1. Emergence of cotyledons
B. Basal cell of 2-called embryo 2. Differentiation of root and shoot
C. Torpedo stage embryo 3. Root apex and suspensor
D. Globularmbryo 4. Bulk of the embryo proper

  1. A-1 B-2 C-3 D-4

  2. A-1 B-3 C-2 D-4

  3. A-4 B-2 C-3 D-1

  4. A-4 B-3 C-2 D-1

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In plant embryogenesis, the apical cell of the 2-celled embryo develops into the embryo proper (bulk of the embryo), while the basal cell forms the suspensor and root apex. The torpedo stage shows clear differentiation of root and shoot, and the globular stage precedes cotyledon emergence. This developmental sequence follows the standard pattern in dicot embryogenesis.

Multiple choice

The developing embryo doesn't receive nourishment from mother's body in

  1. oviparous reproduction

  2. ovoviviparous reproduction

  3. viviparous reproduction

  4. all the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In oviparous reproduction (egg-laying), the embryo develops inside an egg outside the mother's body, nourished by yolk - not directly from the mother. In viviparous reproduction (live birth), the embryo receives nourishment directly from the mother via placenta. In ovoviviparous reproduction, eggs hatch inside the mother's body, and embryos get nourishment from yolk, not directly from mother.

Multiple choice

What term is used for the immature structures that emerge out from graffian follicles?

  1. Oogonia

  2. Cumulus oophorus

  3. Primordial follicles

  4. Granulosa cell

  5. Gamete
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Graffian follicles start out as immature structures called primordial follicles. These are present in females from birth and each contains a single egg cell or oocyte surrounded by a layer of follicular cells. At the beginning of every menstrual cycle, a number of primordial follicles grow larger and each one creates a fluid filled space around its ovum.