Q44 of 57 Page 45

Water hyacinth float on water surface. Explain.

Water hyacinth floats on water surface due to presence of large cavities in parenchyma tissues. These type of parenchyma tissues are known as aerenchyma tissues which make the hyacinth float on water.

Also, water hyacinth has a lot of surface area that lies above the water, this increases its buoyancy and it floats on water.


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42

Differentiate the following activities on the basis of voluntary (V) or involuntary (I V) muscles.

(a) Jumping of frog


(b) Pumping of the heart


(c) Writing with hand


(d) Movement of chocolate in your intestine

 43

Fill in the blanks

(a) Lining of blood vessels is made up of ________


(b) Lining of small intestine is made up of ________


(c) Lining of kidney tubules is made up of ________


(d) Epithelial cells with cilia are found in ________ of our body.

 45

Which structure protects the plant body against the invasion of parasites?

 46

Fill in the blanks

(a) Cork cells possesses ______ on their walls that makes it impervious to gases and water.


(b) _______ have tubular cells with perforated walls and are living in nature.


(c) Bone possesses a hard matrix composed of _______ and ______ .