Q14 of 30 Page 70

If the valves in veins of the legs fail to stop the flow of blood, what could be the consequences of this failure? (AS2)

a. Due to presence of valves in the veins the blood in the leg veins only move towards the heart.

b. They check backflow of blood. If the valves in veins of the legs fail to stop flow of blood, the blood accumulates in the veins and causes swelling or inflammation.


c. The blood pressure increases and possibly causing more damage.


d. The swelling of the veins also results in varicose veins and spider veins.


e. If varicose veins are untreated for long time, it leads to venous ulceration.


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12

Phloem is a food source for some animals. How can you justify this statement? (AS1)

 13

Read the given para and name the parts of the heart. (AS1)

We have observed that the heart is divided into four chambers by muscular structure. Any structure that divides two chambers is known as the septum. Now let us try to name the septa present in the heart.


A. The septum that divides the two atria can be named as inter atrial septum


B. The septum that divides the two ventricles can be named as ____________.


C. The septum that divides the atrium and ventricle can be named as ___________.


The holes that connect two chambers are called apertures. Let us try to name the apertures which connect the atria and ventricles.


D. The aperture that is connecting the right atrium and right ventricle can be named as _____.


E. The aperture that is connecting the left atrium and left ventricle can be named _________.


Any structure that closes an aperture and allows one-way movement of materials is called as a valve. Now let us name the valves that are present in the chambers of the heart.


F. The valve that is present between the left atrium and left ventricle can be named as ________.


G. The valve that is present between the right atrium and right ventricle can be named as _______.

 15

What will happen if cell sap of root hair cells contain a high concentration of ions? (AS2)

 16

John prepared stethoscope with a paper cup and plastic tube. Write down the procedure of preparation. (AS3)