1. The neural tube is formed when, catalyzed by Chordin, the neural plate: A) in
ID: 3483407 • Letter: 1
Question
1. The neural tube is formed when, catalyzed by Chordin, the neural plate: A) invaginates B) gastrulates C) evaginates D) lyses E) is cleaved 2. Endoderm give rise to: 12. A) Skin B) Gl tract C) Feet D) Hair E) Scales 3. Which doesn't the mesoderm give rise to?11 A) Nervous system B) Reproductive system C) Circulatory system D) Bones E) Respiratory system 4. What is the first organ system that a blastula forms from invagination ? 14 A) Circulatory B) Nervous C) Digestive D) Excretory E) Reproductive 5. In protostomes the blastopore turns into the: A) mouth B) anus C) respiratory tract D) None of the above 6. How many germ layers are produced during gastrulation? A) 0 B)1 C) 2 D)3 7. What do triploblasts have that diploblasts lack? B) separate mouth and anus C) mouth that is its anus D) 2 germ layers ict descrihes inyagination?Explanation / Answer
1. Neural plate - invaginates (A)
The neural tube formed when neural plate invaginated during the gastrulation process.
2. Endoderm-GI tract (B)
The internal organs lining cells are formed by endoterm layer, which is the innermost layer of embryo.
3.Mesoderm layer
Respirator and nervous system does not arised from mesoderm.
4) First organ system in embryo
Circulatory system (A)
5) In protosomes, blastopores turns into
Mouth (A)
6) Germ cell layers
3 (ectoderm,mesoderm,endoderm)
7) Diploblasts - 2 germ cell layer
Two germ cell layer is unique feature of diploblasts and it is only feature make diploblast different from triploblasts.
.
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