(B) The third ventricle,also known as the $diocoel$,is a small,fluid-filled cavity located within the $diencephalon$ region of the vertebrate brain. I

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(B) The third ventricle,also known as the $diocoel$,is a small,fluid-filled cavity located within the $diencephalon$ region of the vertebrate brain. It is part of the ventricular system that contains cerebrospinal fluid.

Class 11 Biology Neural Control and Coordination Central Neural System

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The third ventricle is present in:

A
Heart
B
Brain
C
Kidney
D
Liver

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Chapter

Neural Control and Coordination

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Central Neural System

The 'Tree of life' is known as:

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Match the following human spinal nerves in column-$I$ with the number of pairs in column-$II$ and choose the correct option.

Column-$I$ Column-$II$

$(a)$ Cervical nerves $(i) \; 5$ pairs

$(b)$ Thoracic nerves $(ii) \; 1$ pair

$(c)$ Lumbar nerves $(iii) \; 12$ pairs

$(d)$ Coccygeal nerves $(iv) \; 8$ pairs

Column-$I$	Column-$II$
$(a)$ Cervical nerves	$(i) \; 5$ pairs
$(b)$ Thoracic nerves	$(ii) \; 1$ pair
$(c)$ Lumbar nerves	$(iii) \; 12$ pairs
$(d)$ Coccygeal nerves	$(iv) \; 8$ pairs