APTET Paper I 11 June 2018 Shift 1 Solved Paper

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Question : 83 of 150
 
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Read the passage and choose the correct answer to the question given after.
A horse is able to sleep standing up as he is able to lock his leg muscles so that he doesn’t fall while sleeping. Nor do all horses in the same field ever lie down at once-one animal always stands on “look out” duty.
The horse locks his leg muscles while standing in order to;
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