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Biology: The Unity and Diversity o...
Biology: The Unity and Diversity o...
The outermost germ layer in a vertebrate gastrula is the ________.
- a. endoderm
- b. ectoderm
- c. mesoderm
- d. dermis
Concept Introduction The gametes unite to form the zygote. The zygote undergoes cleavage to form the blastula. The blastula develops into gastrula. The gastrula undergoes organogenesis to form the fetus.
Reasons for the correct statement:
The blastula undergoes gastrulation to form the gastrula. The gastrula is made of three layers called germ layers. From these germ layers, the organs are developed by the regulated gene expression. The outermost germ layer is called ectoderm. The ectoderm gives rise to skin and the nervous system.
Option b. is given as “ectoderm”
As ectoderm constitutes the outer most germ layer of gastrula, option b. is correct.
Reasons for the incorrect statements:
Option a...
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