Morula is a developmental stage:
a. Between the zygote and blastocyst
b. Between the blastocyst and gastrula
c. After the implantation
d. Between implantation and parturition
NCERT Class XII
Biology - Main Course Book
Chapter 3. Human Reproduction
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(a)Between the Zygote and blastocyst is the answer........
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Morula is a developmental stage between the zygote and blastocyst.
Option: (a)
Explanation:
- After fertilization and formation of the zygote, this zygote divides mitotically to form a ‘solid mass of 12-15 cells’.
- This multicellular ball stage during embryonic development represents the shape of a mulberry and hence is known as morula (In Latin, mulberry = morula).
- Morula represents a very stage in embryonic development which in humans occurs within the first week of fertilization.
- The morula then proceeds to the blastocyst stage. Inner cell mass of this blastocyst develops into an embryo.
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