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ICSE Question Bank
2017Q1(e)(i)Sense Organs
Odd one outModerate1 mark
1(e)

Choose the ODD one out of the following terms given and name the CATEGORY to which the others belong:

Aqueous humour, Vitreous humour, Iris, Central canal

Topic: Parts of the eye

Previous-year question practice database

Answer

Exam answer

Odd term: CENTRAL CANAL. Category of the others: PARTS OF THE EYE.

Explanation

The aqueous humour, vitreous humour and iris are all parts of the EYE. The CENTRAL CANAL is the narrow channel running through the grey matter of the SPINAL CORD, filled with cerebrospinal fluid.

THE TRAP is that all four sound like internal cavities or fluids, which invites you to group them by sound rather than by system. Ask which ORGAN each belongs to.

The three correct terms, since they are often confused with one another: AQUEOUS HUMOUR — watery fluid IN FRONT of the lens VITREOUS HUMOUR — jelly-like fluid BEHIND the lens IRIS — the coloured muscular curtain controlling the size of the pupil

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