Choose the option that correctly describes night blindness-A person cannot see in low light-A person becomes blind during day and night-A person becomes blind at midnight-None of the above-

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Deficiency of Vitamin A

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Question

Choose the option that correctly describes night blindness.

A person becomes blind at midnight

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A person cannot see in low light

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A person becomes blind during day and night

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None of the above

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Solution

The correct option is B
A person cannot see in low light

Night blindness means a person loses his/her ability to see in low light due to impaired function of specific vision cells in the retina. It does not mean that the person is completely blind during the night. Such a condition occurs due to an insufficient amount of vitamin A in the diet.

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Q. In some plants, the leaves droop down during day, while become normal during night

Match the reasons given in column 2 to the features of cacti on column 1.

$\begin{matrix} F e a t u r e o f c a c t i & R e a s o n s a . Spiny leaves & (i) Absorbing water from depths of soil b . Thick, round fleshy stems & (i i) Prevent loss of water by transpiration c . Deep roots & (i i i) Store water d . Closed stomata during the day & (i v) Prevent animals from eating the cactus e . Carbon dioxide storage during the night \end{matrix}$

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