General Science Topics MCQ - Biology WBCS SSC UPSC RAIL P1

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14511. Earliest gland appeared in the human embryo is

A

Pituitary gland

B

Thyroid gland

C

Thymos

D

Hypothalamus

A

Correct Answer: A. Pituitary gland
Explanation: The earliest organ that appears in the embryo is the heart.

13762. Proteins are detected by

A

DNP test

B

Benedict's test

C

Molisch's test

D

Biuret test

D

Correct Answer: D. Biuret test
Explanation:

• Benedict's test is to determine reducing sugar.
• DNP test is to determine the ketone or aldehyde group.
• Molisch's test is to determine Carbohydrates.
• Biuret test is yo determine proteins.

14503. Normal human blood is

A

Acidic

B

Alkaline

C

Neither acidic nor basic

D

None of this

B

Correct Answer: B. Alkaline
Explanation: pH of human blood is ranged between 7.35 - 7.45

13564. Amount of blood pumped by an adult heart per hour is about

A

300 liter

B

340 liter

C

150 liter

D

200 liter

A

Correct Answer: A. 300 liter
Explanation: 1 min ~ 5 lit 
60 min~ 5×60= 300 Lit

12565. Which of the following becomes zero in a fully turgid cell?

A

Osmotic pressure

B

All of the above

C

Water potential

D

Wall pressure

C

Correct Answer: C. Water potential
Explanation: Water potential is a tendency of water to move due to Osmotic pressure, gravitational force or some other forces. A fully turgid cell cannot absorve any more water because the wall pressure and Osmotic pressure became equal. In this situation water potential becames zero.

12626. Which one is not a protozoan?

A

Amoeba

B

Paramoec

C

Hydra

D

Euglena

C

Correct Answer: C. Hydra
Explanation: Historicall is was considered that protozoan is a single celled animal. Now a protozoan is a single celled eukaryotes nucleas microorganism.

12507. Birds differ from the bat in the absence of

A

Trachea

B

Diaphragm

C

Warmblood

D

Four-chambered heart

B

Correct Answer: B. Diaphragm
Explanation: Diaphragm is a skeletal muscle in mammals which separatea the thoracic cavity where heart and lungs present from abdominal cavity. It helps in respiration.

12538. A mammal that lays eggs:

A

Pteropus

B

Lemur

C

Talpa

D

Echidna

D

Correct Answer: D. Echidna
Explanation: Other animal which lay eggs is platypus. All of the egg laying animals belong to order of monotremata.

14539. Dormancy of seeds is promoted by?

A

ABA

B

IAA

C

Auxin

D

Gebbrilin

A

Correct Answer: A. ABA
Explanation: Abscisic Acid(ABA) control the dormancy of seeds. It is also called anti-gibberellin hormone.

138110. In respiration, cytosol plays a significant role in

A

Krebs cycle

B

Glycolysis

C

Oxidative phosphorylation

D

Oxidative decarboxylation of pyruvic acid

B

Correct Answer: B. Glycolysis
Explanation: Many important cellular processes and reactions, especially of metabolic character, occur in the cytosol. These processes include protein synthesis through translation, the first stage of cellular respiration through glycolysis, and cell division through mitosis and meiosis.

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