Why do veins have valves but not the arteries? 

Important Questions on Transportation in Plants and Animals

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 4 - Transportation in Plants and Animals>EXERCISES>Q VIII

Why are veins in old persons very prominent? 

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 4 - Transportation in Plants and Animals>EXERCISES>Q VIII

We sweat in summer but not in winter. Why? 

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 4 - Transportation in Plants and Animals>EXERCISES>Q VIII

Ventricles have thicker walls than auricles. Why? 

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 4 - Transportation in Plants and Animals>EXERCISES>Q VIII

Why there is an upward movement of water and dissolved minerals in plants?

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 4 - Transportation in Plants and Animals>EXERCISES>Q VIII

Why openings of auricles into ventricles are guarded by valves?

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 4 - Transportation in Plants and Animals>Brain Teasers

What makes water to rise in tall trees several metres high? 

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 4 - Transportation in Plants and Animals>Brain Teasers

Why are the white blood cells called soldiers of our body?

MEDIUM

7th CBSE

IMPORTANT

SCIENCE ROUTE 7>Chapter 4 - Transportation in Plants and Animals>Brain Teasers

What will happen if the platelets count in our blood goes down substantially?