491. The process by which plants produce food is called-

1. Carbohydrolysis
2. Metabolic synthesis
3. Photosensitization
4. Photosynthesis

Option “4” is correct
Through the process of photosynthesis, green plants have a capacity of manufacturing their food from simple substance as Co2 and H20 in presence of light.
492.  Deficiency of Iron causes-

1. Filaria
2. Malaria
3. Anemia
4. Fluorosis

Option “3” is correct
Anaemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to body tissues. There are many types of anaemia. Iron deficiency anaemia occurs when your body does not have enough iron. Iron helps make red blood cells.
493. Most frequently used medicine for AIDS is-

1. Zedovudine (Azidothymidine)
2. Micronazol
3. Nanaxinel-a
4. Vinajol

Option “1” is correct
Zidovudine, also known as azidothymidine, is an antiretroviral medication used to prevent and treat HIV/AIDS.
494. Lymphocytes cells are formed in which part of human body?

1. Chest
2. Knee
3. Head
4. Spleen

Option “4” is correct
A lymphocyte is one of the three sub types of white blood cell in a vertebrate’s immune system. Lymphocytes circulate in blood and lymph fluid is found in body tissues including the spleen, thymus, bone marrow, lymph nodes, tonsils, and liver. B-Lymphocytes and T-Lymphocytes are the two main types of lymphocytes.
495. The blood group of universal donor is-

1. B
2. O
3. A
4. AB

Option “2” is correct
Individuals with blood group ‘O’ are a universal donor because their red blood cells have neither A nor B antigens on their surface. So, the blood of a person having O group can be given to people with any blood group.
496. The total volume of blood in a normal adult human being is-

1. 5-6 litres
2. 3-4 litres
3. 8-10 litres
4. 10-12 litres

Option “1” is correct

Blood is a special connective tissue consisting of a fluid matrix, plasma, and formed elements. The total volume of blood in normal adult human being is 5-6 litres.
497. The process by which blood is purified in human body is called-

1. Dialysis
2. Haemolysis
3. Osmosis
4. Paralysis

Option “1” is correct

Dialysis is a process for removing waste and excess water from the blood and is used primarily as an artificial replacement for lost kidney function in people with kidney failure. Dialysis filters out unwanted and fluids from the blood.
498. The major chemical compound found in human kidney stones is:

1. Urea
2. Calcium carbonate
3. Calcium oxalate
4. Calcium sulphate

Option “3” is correct

A major constituent of human kidney stones is calcium oxalate.
499. The most abundant element found in the human body is-

1. Iron
2. Sodium
3. Oxygen
4. Iodine

Option “3” is correct
Nearly 99% of the mass of human body consists of just six chemical elements: oxygen, carbon, hydrogen, nitrogen, calcium and phosphorus. Oxygen is the most abundant element in the human body. It is mainly found in the form of water.
500. Chromosomes found in cell which are responsible for characters other than sex are called –

1. Genome
2. Autosome
3. Plasmagen
4. Tonoplast

Option “2” is correct
Chromosomes found in cell which are responsible for characters other than sex are called Autosome.
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