RBC

Q.

Why red blood cells do not have nuclei present in them?

Q.

Persons with the AB blood group are called universal recipients. This is due to:

1. Absence of antibodies, anti-A, and anti-B, in plasma

2. Absence of antigens A and B in plasma

3. Presence of antibodies, anti-A, and anti-B, on RBCs

4. Absence of antigens A and B on the surface of RBCs

Q.

Why is the rate of heart beat more in babies ? Why do they have more temperature as compared to adults ?

Q.

A person with blood group AB is considered as universal recipient because he has:

1. Both A and B antigens on RBC but no antibodies in the plasma

2. No antigen on RBC and no antibody in the plasma

3. Both A and B antigens in the plasma

4. None of the above

Q.

What happens to a cell if it is placed in a hypotonic solution?

Q.

What is the shape of red blood cells?

Q. What is deoxygenated and oxygenated

Q.

Milk, cheese, and Eggs are sources of which vitamin?

Q.

Account for the following:

Wilted lettuce leaves become crisp/firm when placed in cold water for a while.

Q.

Vitamin essential for blood clotting is

1. Vitamin A

2. Vitamin E

3. Vitamin C

4. Vitamin K

Q.

1 μm is :

1. 10^-6 m

2. 10^-9 m

3. 10^-10 m

4. 10^-3 m

Q. Define excretion. Write the four organs of the human urinary system in their correct sequence.

Q.

Mention the location of kidney in humans.

Q. The concentration of oxygen and carbon dioxide in deoxygenated blood is-

1. Oxygen - 80$\%$ and Carbon dioxide - 20$\%$
2. Oxygen - 21$\%$ and Carbon dioxide - 0.04$\%$
3. Oxygen - 16$\%$ and Carbon dioxide - 4$\%$
4. Oxygen - 29$\%$ and Carbon dioxide - 71$\%$

Q.

Name the following
The organic constituents of normal urine.

Q. Which of the following are components of blood?

1. Serum
2. Red blood cells
3. White blood cells
4. Bile

Q. Fill in the blanks:
(ii) The unit of the human kidney is called

Q. The blood cells, which do not have a nucleus are:

1. Red blood cells
2. Blood platelets
3. White blood cells
4. None of these

Q.

The hardness of the bone tissue is due to the phosphates and carbonates of ___________ and ___________.

1. Calcium and Sodium

2. Magnesium and Potassium

3. Magnesium and Sodium

4. Calcium and Magnesium

Q.

How does a living cell behave in hypotonic and isotonic solutions?

Q.

What is a vitamin? What are its types?

Q.

HCl is produced in

1. intestine

2. liver

3. kidney

4. stomach

Q. Fill in the blanks:
(i) Nitrogenous wastes in urine are in the form of and

Q. Write two functions of Vitamins?

Q.

To which organ system tonsil, spleen and thymus belong to?

1. Respiratory system

2. Endocrine system

3. Nervous system

4. Lymphatic system

Q.

(i) What is the importance of iodized salt in our diet?
(ii) Why is it required?
(iii) Which disease may happen if it is in less amount in our body?

Q. Define the following:

(iv) Nephron

Q.

Name the vitamins found in fishes and other aquatic animals.

Q.

Write any two functions of kidneys.

Q. Put a tick (✓) against the most appropriate alternative in the following statements.
(iv) Filtration of excretory wastes from the blood occurs in:

1. urinary bladder
2. nephrons
3. collecting tubule
4. ureter