In the development of the human body,the ecto | vedclass

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(D) During human embryonic development,the three germ layers (ectoderm,mesoderm,and endoderm) give rise to various tissues and organs. $1$. The ectode

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All of these

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(D) During human embryonic development,the three germ layers (ectoderm,mesoderm,and endoderm) give rise to various tissues and organs. $1$. The ectoderm is the outermost layer and is responsible for forming the central and peripheral nervous system,the epidermis of the skin,hair,nails,and sweat glands. $2$. It also contributes to the formation of the lens of the eye and the enamel of the teeth. $3$. Since all the options listed (sweat glands,nervous system,and lens of the eye) are derivatives of the ectoderm,the correct answer is $D$.

Column $I$	Column $II$
$(a)$ Third week	$(1)$ Development of pre-umbilical cord
$(b)$ Third month	$(2)$ Body develops but head remains big
$(c)$ Fourth week	$(3)$ Embryonic slit widens
$(d)$ Fourth month	$(4)$ Muscles activate

In the development of the human body,the ectoderm is responsible for the formation of:

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Match the columns:

Column $I$ Column $II$

$(a)$ Third week $(1)$ Development of pre-umbilical cord

$(b)$ Third month $(2)$ Body develops but head remains big

$(c)$ Fourth week $(3)$ Embryonic slit widens

$(d)$ Fourth month $(4)$ Muscles activate

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