What Is Germ Layer

Q.

Difference between blastula and gastrula?

Q. Epithelial cells arise from which germ layer?

1. Ectoderm
2. All of the above
3. Mesoderm
4. Endoderm

Q. Which of the following tissues arise from the mesoderm?

1. Epithelial
2. Connective
3. Muscular
4. Both b and c

Q.

Which is correct about human embryonic development a)cleavage divisions brings about considerable increase in mass of protoplasm

b)in the second division, one of the two blastomeres usually divides a little sooner than the second

c)with more cleavage division, the resultant blastomeres becomes larger and larger

d)cleavage division result in hollow ball of cells called morula

Q. Which of the four basic tissues develops from all three germ layers?

1. Epithelial tissue
2. Connective tissue
3. Muscular tissue
4. Nervous tissue

Q. Epithelial tissue is derived from which embryological germ layer(s)? Select the correct answer:

I. Ectoderm
II. Mesoderm
III. Endoderm

1. I Only
2. I, III only
3. II, III Only
4. I, II & III

Q. Match the following columns and choose the correct option:
$\begin{array}{cc}\text{A. Ovary}& \text{1. Infundibulum, ampulla and isthmus}\\ \text{B. Uterus}& \text{2. Medulla and cortex}\\ \text{C. Fallopian tube}& \text{3. Perimetrium, myometrium, endometrium}\end{array}$

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

Q. Which of the following tissues arise from the mesoderm?

1. Epithelial
2. Connective
3. Muscular
4. Both b and c

Q. Epithelial tissue is derived from which embryological germ layer(s)? Select the correct answer:

I. Ectoderm
II. Mesoderm
III. Endoderm

1. I Only
2. I, III only
3. II, III Only
4. I, II & III

Q. Which of the following layers of the womb is composed of connective tissues?

1. Perimetrium
2. Myometrium
3. Stratum germinativum
4. Stratum corneum

Q.

which embryonic cells produce extra embryonic membrane

Q. The amnion of the mammalian embryo is derived from

1. Mesoderm and trophoblast
2. endoderm and mesoderm
3. ectoderm and mesoderm
4. ectoderm and endoderm

Q. Cytoskeleton is made up of

1. Cellulose microfibrils
2. Calcium carbonate granules
3. Callose deposits
4. Proteinaceous filaments

Q. Draw the labelled diagram of Embryo-sac.

Q. The amnion of mammalian embryo is derived from

1. Mesoderm and trophoblast
2. Ectoderm and mesoderm
3. Ectoderm and endoderm
4. Endoderm and mesoderm

Q. The polar nuclei present inside the embryo sac are

1. Haploid
2. Diploid
3. Unknown
4. None of the above

Q. Epithelial cells in animals are held by specialized junctions, one of them being "Gap junction". Function of a "Gap junction" is to ____________.

1. facilitate cell-cell communication by rapid transfer of small molecules
2. cement the neighbouring cells
3. stop substance from leaking
4. provide gaps in the tissue to facilitate uptake of small molecules across tissues

Q. In early haemopoietic tissue of embryo, there is

1. Chorion
2. Amnion
3. Allantois
4. Yolk sac

Q. Endometrium refers to the lining of

1. Intestine
2. Uterus
3. Bones and blood vessels
4. All of the above

Q. The normal type of embryo sac is 8-nucleated and ............

1. 8 celled
2. 7 celled
3. 6 celled
4. 5 celled

Q. Desmosomes are the most common feature of

1. Epithelial tissue
2. Nervous tissue
3. Muscular tissue
4. All of the above

Q. The basal cell in a zygote

1. Develops into the root of the embryo
2. Forms the suspensor that anchors the embryo and transfers nutrients
3. Divides to form the two cotyledons of the proembryo
4. Results from the fertilization of polar and sperm nuclei and develops into the endosperm

Q. Layer of columnar cells with uneven appearance and lining trachea is?

1. Brush border epithelium
2. Pseudostratified epithelium
3. Stratified epithelium
4. Ciliated epithelium

Q. The amnion of the mammalian embryo is derived from

1. Mesoderm and trophoblast
2. endoderm and mesoderm
3. ectoderm and mesoderm
4. ectoderm and endoderm

Q. The amnion of mammalian embryo is derived from

1. ectoderm and mesoderm
2. ectoderm and endoderm
3. mesoderm and trophoblast
4. endoderm and mesoderm

Q. Amnion surrounds the

1. Allantois
2. Chorion
3. Embryo
4. Yolk sac

Q. Which of the following protects the embryo from external injury?

1. Amnion
2. Yolk sac
3. Chorion
4. Allantois

Q. First scientist to study development of angiosperm embryo was

1. Strasburger
2. Flemming
3. Hanstein
4. Hofmeister

Q. Assertion :Polyspermy may bring about fertilization of synergids or antipodal. Reason: The embryo sac is penetrated by more than one pollen tube.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect