721. Blood fails to clot, while flowing in the blood vessel because of the presence of –

1. Heparin
2. Prothrombin
3. Haemoglobin
4. Hirudin

Option “1” is correct
Heparin is an anticoagulant (blood thinner) that prevents the formation of blood clots in blood vessel. Heparin is used to treat and prevent blood clots in the veins, arteries, or lung.
722. The vitamin most readily destroyed by heat is –

1. Riboflavin
2. Ascorbic acid
3. Tocopherol
4. Thiamine

Option “2” is correct

Vitamin C also known as Ascorbic acid is easily destroyed by excessive heat and water, as well as exposure to air.
723. Rickets is the deficiency disease of vitamin-D, in which the affected part is the –

1. Skin
2. Hair
3. Bone
4. Blood

Option “2” is correct
Rickets is a bone disease that affects infants and young children. The child’s growing bones fail to develop properly due to a lack of vitamin D. This can result in soft and weakened bones, fractures, bone and muscle pain, and bony deformities.
724. Normal blood pressure reading of an adult human:

1. 80/140 mm Hg
2. 120/80 mm Hg
3. 130/90 mm Hg
4. 160/95 mm Hg

Option “2” is correct
According to the American Heart Association (AHA) normal blood pressure is a systolic pressure of less than 120 millimeters of mercury (mm Hg) and a diastolic pressure of more than 80 mm Hg, or 120/80 mm Hg.
725. ‘Red Data Book’ provides an account of-

1. Endangered plants only
2. Fossil plants
3. Endangered plants and animals
4. Extinct animals only

Option “3” is correct
The Red Data Book is the state document established for documenting rare and endangered species of animals, plants and fungi as well as some local sub-species that exist within the territory of the state or country.
726. Due to which the blood has red colour:

1. Plasma
2. Hemoglobin
3. Haemocynin
4. W.B.C.

Option “2” is correct

The red colour of red blood cells in the blood is due to the combining of a protein known as hemoglobin with oxygen. Red blood cells are also called erythrocytes which are found only in the blood of vertebrates. There is no nucleus inside the red blood cells.
727. Latest ancestor of modern human is-

1. Java man
2. Cro-magnon man
3. Neanderthal man
4. Peking man

Option “2” is correct
Cro-magnon is a common name that has been used to describe the first early modern humans. However, recent research suggests that the physical dimensions of so-called “Cro-magnon” are not sufficiently different from modern humans to warrant a separate designation.
728. Pungency in chillies is due to the present of:

1. Lycopene
2. Capsaicin
3. Carotene
4. Anthocyanin

Option “2” is correct

Chillies are valued principally for their high pungency and colour. Pungency in chillies is due to the active constituent “Capsaicin” an alkaloid which is extracted from chillies and is used to the medicine.
729. Trophic level-I includes:

1. Herbivorous animals
2. Carnivorous animals
3. Omnivorous animals
4. Green plants

Option “4” is correct
Trophic level-I includes all autotrophs which synthesize their food by themselves. All green plants belong to this trophic level.
730. 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, hydroge, nitrogen, calcium and phosphorus. Oxygen is the most abundant element in the human body. It is mainly found in the form of water.
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