GATE XL Development Biology PYQs & Answers

Questions 1–10 of 13. Imported answers require independent review unless marked reviewed.

During the development of a mammalian embryo, “yolk sac” is formed by which one of the following?

Your answerChoose one option.

Syncytiotrophoblast

Primitive endoderm (hypoblast)

Amniotic ectoderm

Embryonic epiblast

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Which of the following statements in relation to cell movement during gastrulation in Sea urchin is/are correct?

Your answerSelect all correct options. You can choose more than one.

Delamination leads to the formation of endoderm

Ingression leads to the development of mesoderm

Involution leads to the development of ectoderm

Invagination leads to the development of endoderm

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Which one of the options correctly matches the human tissues/organs with their embryonic germ layers of origin?

Tissues/organs	Embryonic germ layers
(P) liver	(I) ectoderm
(Q) cerebellum	(II) endoderm
(R) femur	(III) mesoderm

(A) P-II, Q-I, R-III (B) P-III, Q-I, R-II (C) P-I, Q-II, R-III (D) P-II, Q-III, R-I

Your answerChoose one option.

P-II, Q-I, R-III

P-III, Q-I, R-II

P-I, Q-II, R-III

P-II, Q-III, R-I

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The embryos of which one or more of the following animals show meroblastic cleavage?

Your answerSelect all correct options. You can choose more than one.

Danio rerio (zebrafish)

Gallus gallus (chicken)

Synapta digitata (sea cucumber)

Xenopus laevis (frog)

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Which of the following animals show “Bottle cells” during the gastrulation stage of development?

Your answerChoose one option.

Snails

Amphibians

Birds

Mammals

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In an experiment, excess amount of bicoid mRNA (more than wild-type expression level) was injected into the posterior pole of a wild-type Drosophila embryo at pre-blastodermal stage. Out of the following options, which one represents the best expected phenotype in the resulted developing embryo?

Your answerChoose one option.

Normal embryo with head structure at anterior and tail structure at posterior pole

Head structure only at posterior pole of the embryo

Tail structure at anterior and head structure at posterior poles of the embryo

Head structure at both anterior and posterior poles of the embryo

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To which class of Drosophila development genes does fushi tarazu (ftz) belong?

Your answerChoose one option.

Gap genes

Segment polarity genes

Pair rule genes

Maternal effect genes

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Match the terms in Column I with the specific descriptions in Column II

Column I P. Zygote Q. Morula R. Blastocyst S. Ovum T. Neonate U. Fetus

Column II (i) A hollow sphere of cells (ii) A newly born offspring (iii) A cell that results from fertilization (iv) An embryo (v) An unfertilized egg (vi) A compact mass of cells

Your answerChoose one option.

P-(ii), Q-(vi), R-(i), S-(v), T-(ii), U-(iv)

P-(v), Q-(ii), R-(iii), S-(vi), T-(i), U-(iv)

P-(ii), Q-(iv), R-(vi), S-(v), T-(i), U-(iii)

P-(iii), Q-(vi), R-(ii), S-(v), T-(iv), U-(i)

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Match the types of cell movements during gastrulation in Column I with the descriptions in Column II

Column I P. Invagination Q. Involution R. Ingression S. Delamination

Column II (i) Migration of individual cells from the surface into the embryo’s interior (ii) Infolding of a sheet (epithelium) of cells during the formation of endoderm in sea urchin (iii) Splitting of one cellular sheet into two nearly parallel sheets (iv) Inward movement of an expanding outer layer of cells so that it spreads over the internal surface of the remaining external cells

Your answerChoose one option.

P-(ii), Q-(iii), R-(iv), S-(i)

P-(iv), Q-(i), R-(iii), S-(ii)

P-(ii), Q-(iv), R-(i), S-(iii)

P-(iii), Q-(ii), R-(iv), S-(i)

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Closure of neural tube during neurulation is the process in which neural tube eventually forms a closed cylinder that separates from surface ectoderm. Which one of the following terms is linked to the failure in the closure of entire neural tube i.e. brain and spinal cord, over the body axis?

Your answerChoose one option.

Craniorachischisis

Spina bifida

Anencephaly

Cleft palate

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GATE XL Development Biology PYQs

How to practice Development Biology

Question 86

Question 100

Question 94

Question 99

Question 88

Question 93

Question 87

Question 11

Question 13

Question 14