(A) The correct answer is $A$. In the earthworm,each photoreceptor cell contains a nucleus and its cytoplasm possesses a specialized optic organelle k

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(A) The correct answer is $A$. In the earthworm,each photoreceptor cell contains a nucleus and its cytoplasm possesses a specialized optic organelle known as a phaosome. This phaosome is an $L$-shaped lens composed of a transparent,hyaline substance that helps in light perception.

Class 11 Biology Structural Organisation In Animals Anatomy of Earthworm

Easy

Phaosome in Earthworm is

A
Lens
B
Pigment
C
Nephridium
D
Hormone

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Class 11

Biology Questions

Chapter

Structural Organisation In Animals

Subtopic

Anatomy of Earthworm

Explain the process of mating and the formation of the cocoon in earthworms.

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Match the following columns regarding the types of nephridia in earthworms:

Column-$I$ Column-$II$

$P$. Septal nephridia $I$. $15^{th}$ segment to the last segment

$Q$. Integumentary nephridia $II$. $4^{th}, 5^{th}$ and $6^{th}$ segments

$R$. Pharyngeal nephridia $III$. $3^{rd}$ segment to the last segment

Column-$I$	Column-$II$
$P$. Septal nephridia	$I$. $15^{th}$ segment to the last segment
$Q$. Integumentary nephridia	$II$. $4^{th}, 5^{th}$ and $6^{th}$ segments
$R$. Pharyngeal nephridia	$III$. $3^{rd}$ segment to the last segment