Q10 of 10 Page 178

Collect the information to justify the statement ‘Human beings are intelligent and different from other animals’ and present it in the classroom.

Human beings are intelligent and different from other animals due to the following reasons:

I. Size of the brain: in enlarged brain in neuron connections more which increases IQ. Whereas, the number of brain cells actually remains constant in other animals.


II. Development of large number of folds: a greater number of folds in the cerebral cortex is a significant step in human brain evolution, it increases intelligence.


III. Division of cerebrum: Another unique feature of the human brain division of the cerebrum into 2 halves. The left side of our brain controls the right side of our body and right side of our brain controls left side of the body.


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6

Answer the following.

A. Explain chemical co-ordination in humans and give the names and functions of some hormones.


B. Explain the difference between the excretory system of humans and plants.


C. Explain co-ordination in plants with the help of suitable examples.

 7

Explain in your own words with suitable examples.

A. What is meant by co-ordination?


B. How does excretion occur in human beings?


C. How is excretion in plants useful to human beings?


D. Describe the transportation system in plants.

 8

Collect information about the evolution of the brain of vertebrates and present it in the classroom.

 9

Explain the functions of various endocrine glands by presenting an act like ‘Why I Am Important?’