(A) Mammalian eggs are classified as $Alecithal$ (or $Microlecithal$ in some contexts) because they contain a negligible or very small amount of yolk.

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(A) Mammalian eggs are classified as $Alecithal$ (or $Microlecithal$ in some contexts) because they contain a negligible or very small amount of yolk. Since the embryo receives nourishment directly from the mother through the placenta,there is no need for a large yolk reserve.

Class 12 Biology Human Reproduction Gametogenesis

Easy

What type of eggs do mammals have?

A
Alecithal
B
Microlecithal
C
Macrolecithal
D
Telolecithal

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Class 12

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Chapter

Human Reproduction

Subtopic

Gametogenesis

In mammalian sperm,spirally arranged mitochondria are present in

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Match the columns.

Column $I$ Column $II$

$(a)$ Multiplier phase $(1)$ Undeveloped primary oocyte

$(b)$ Growth phase $(2)$ Primary oocyte filled with developed cytoplasm

$(c)$ Maturation $1$ $(3)$ Secondary oocyte

$(d)$ Maturation $2$ $(4)$ Germinal epithelial cells

Column $I$	Column $II$
$(a)$ Multiplier phase	$(1)$ Undeveloped primary oocyte
$(b)$ Growth phase	$(2)$ Primary oocyte filled with developed cytoplasm
$(c)$ Maturation $1$	$(3)$ Secondary oocyte
$(d)$ Maturation $2$	$(4)$ Germinal epithelial cells