CBSE Questions for Class 5 Evs Super Senses Quiz 1 - MCQExams.com

• A lizard generally sleeps around 60-80 seconds but its longest sleep can be 4 hours.
  
• A horse can sleep up to 3 hours a day.
  
• A python being the longest sleeping animal can sleep around 2 weeks continuously.
• A dog sleeps between 12 and 14 hours per 24-hour cycle.

• Cows usually sleep around 3-4 hours a day. But it doesn't happen in a single go, but instead for shorter periods of time. 
• A cow takes frequent naps throughout the day and especially the night, which typically last between one and five minutes at a time.
  
  

$$\textbf{Correct option: A}$$

$$\textbf{Solution:}$$

Option A:

$$\bullet$$ Our nails and hair are made up of dead cells and these dead cells are devoid of nerves. So the impulses cannot be supplied to the brain and response is not produced. That is the reason why we do not sense any pain when we clip our nails or cut our hair.

$$\bullet$$ Most of the part of nails and hair is made up of dead cells and only the base part has living cells which have nerve supply.

Hence the correct option is option A.

• In Unihemispheric sleep, also known as asymmetric slow-wave sleep, one half of the brain is in deep sleep, and the eye corresponding to this half is closed while the other half remains alert and one eye remains open. It keeps the organism alert for predators.

• Lizard being a reptile is a cold-blooded animal. 
• Cold-blooded refers to the ability of an organism to change its body temperature with respect to the surrounding.
• During the extremely cold, lizards face the danger of either their blood freezing up or their temperature dropping drastically, as a result of which they become immobile and can easily fall prey to enemies. 
• Hence, lizards hibernate in cracks of walls or beneath the soil to conserve energy and to avoid predators.