1. Blood Plasma with which among the following removed is called Serum?
[A] Fibrin
[B] Thrombin
[C] Fibrinogen
[D] Collagen
Show Answer
Correct Answer: C [Fibrinogen]
Notes:
Plasma is 55% of the blood by volume and constitutes 5% of the body weight. Plasma is a pale yellow transparent clear fluid which consists of 90-92% water and 8-10% organic and inorganic substances. Organic substances are mainly plasma proteins viz. albumin, globulin, prothrombin and fibrinogen. Albumins are responsible for maintenance of osmotic pressure of Blood. Globulins are chief sites for formation of antibodies; while prothrombin and fibrinogen are essential for clotting of blood
2. The reverse osmosis is the process of forcing a solvent from a region of high solute concentration through a membrane to a region of low solute concentration by applying a pressure on ________?
[A] Concentrated solution
[B] Dilute solution
[C] Membrane
[D] None of the above
Show Answer
Correct Answer: A [Concentrated solution]
Notes:
This process requires that a high pressure be exerted on the high concentration side of the membrane.
3. Calcium is required in plants in the formation of which of the following ?
[A] Cell Membrane
[B] Cell wall
[C] Cholorophyll
[D] None of the above
Show Answer
Correct Answer: B [Cell wall]
Notes:
Calcium is required in plants in the formation of cell wall. It is a structural layer surrounding some types of cells, just outside the cell membrane. The cell wall can be tough, flexible, and sometimes rigid also.
4. The metals in which among the following groups are required in maximum quantities in a living organism?
[A] Potassium, Manganese, Molybdenum, Calcium
[B] Potassium, Molybdenum, Copper, Calcium
[C] Pottassium,Sodium, Magnesium, Calcium
[D] Sodium, Magnesium, Copper, Manganese
Show Answer
Correct Answer: C [Pottassium,Sodium, Magnesium, Calcium]
Notes:
Potassium, Sodium, Magnesium, Calcium are required in maximum quantities in a living organism.
5. Which of the following tests is used for the diagnosis of ‘Colour-Blindness’ in people ?
[A] Ishihara Test
[B] Widal Test
[C] ELISA test
[D] Rorschach test
Show Answer
Correct Answer: A [Ishihara Test]
Notes:
Ishihara Test is used for the diagnosis of ‘Colour-Blindness’ in people. The test contains a number of colored plates, called Ishihara plates. Each of these plates contain a circle of dots appearing randomized in color and size.
6. Why do birds not experience respiratory issues while flying at high altitudes?
[A] Their lungs are larger relative to body size
[B] They fly inactively at high altitudes
[C] None of the above is correct
[D] Birds possess additional air sacs
Show Answer
Correct Answer: D [Birds possess additional air sacs]
Notes:
Birds have unique respiratory systems with extra air sacs that provide continuous airflow and efficient oxygen exchange, even at high altitudes where air is thinner. These adaptations help birds avoid respiratory trouble during flight.
7. Which of the following is the best reason behind the fact that bats can fly in the dark? (UPSC Prelims 1979).
[A] Bats have a better vision in the dark
[B] The light startles them
[C] Bats produce high pitched sounds ultrasonic
[D] None of the above
Show Answer
Correct Answer: C [Bats produce high pitched sounds ultrasonic]
Notes:
The sounds that bats make are so high pitched that humans cannot hear them. High pitched sounds like this are called ultrasound. So, bats make high pitched squeaks while they fly. The echoes travel back to the bat and it can then tell how far away the objects are.
Bats use echoes or reflected sounds to determine the surrounding situation and to locate their prey. Often we see the bats fly at night. They fly in the dark so quickly without hitting anything. This process is called echolocation.
8. Which one of the following is secreted by Pancreas and regulates the amount of sugar in the body? (UPSC Prelims 1980).
[A] Renin
[B] Creatin
[C] Vitamin
[D] Insulin
Show Answer
Correct Answer: D [Insulin]
Notes:
Insulin and glucagon are hormones secreted by islet cells within the pancreas. They are both secreted in response to blood sugar levels, but in opposite fashion. Insulin is normally secreted by the beta cells of the pancreas. Glucagon raises blood glucose levels by stimulating the liver to metabolize glycogen into glucose molecules and to release glucose into the blood. Insulin is a hormone that regulates blood sugar levels.
9. Bile is secreted by which of the following organs? (UPSC Prelims 1985)
[A] Liver
[B] Gall bladder
[C] Kidney
[D] Pancreas
Show Answer
Correct Answer: A [Liver]
Notes:
Bile or gall is a dark green to yellowish brown fluid, produced by the liver of most vertebrates that aids the digestion of lipids in the small intestine. In humans, bile is produced continuously by the liver and stored and concentrated in the gallbladder.
10. In Mycorrhiza, symbiotic association occurs between which of the following organisms? (UPSC Prelims 1990)
[A] Bacteria and roots of higher plants
[B] Algae and roofs of orchids
[C] Fungi and roots of higher plants
[D] Protozoa and roots of higher plants
Show Answer
Correct Answer: C [Fungi and roots of higher plants]
Notes:
Mycorrhiza is a symbiotic association between a fungus and a plant. The term mycorrhiza refers to the role of the fungus in the plant’s rhizosphere, its root system.
