0

Class 11 Biology Mcqs

Q:

Which of the following does not affect the rate of diffusion?

A) Temperature B) Pressure
C) ATP available D) Concentration gradient
 
Answer & Explanation Answer: C) ATP available

Explanation: Diffusion is a passive process and it doesn’t require energy in the form of ATP. Temperature, Pressure and Concentration gradient do affect the rate of diffusion to varying degrees.

View Answer Discuss

Category: School MCQs
Sub Category: Class 11 Biology Mcqs

280
Q:

Statement A: The opening of wind pipe is called gastro-esophageal sphincter.
Statement B: Its covering prevents the entry of food.

A) Both the statements are true B) Both the statements are false
C) Statement A is true but Statement B is false D) Statement B is true but Statement A is false
 
Answer & Explanation Answer: D) Statement B is true but Statement A is false

Explanation: Trachea is the wind pipe. It has a cartilaginous flap called epiglottis. It prevents the entry of food into the glottis during swallowing.

View Answer Discuss

Category: School MCQs
Sub Category: Class 11 Biology Mcqs

220
Q:

Which among the following is incorrect about fructose and glucose?

A) Fructose is also called as pyranose and it’s a ketose sugar B) Glucose and fructose can be obtained by hydrolysis of sucrose
C) Both fructose and glucose have the same molecular formula D) Both of them taste sweet
 
Answer & Explanation Answer: A) Fructose is also called as pyranose and it’s a ketose sugar

Explanation: Fructose is also called as furanose and it’s a ketose sugar. Glucose and fructose can be obtained by hydrolysis of sucrose. Both fructose and glucose have the same molecular formula. Both of them taste sweet.

View Answer Discuss

Category: School MCQs
Sub Category: Class 11 Biology Mcqs

201
Q:

Which of the following are not involved in the monitoring of kidneys?

A) Hypothalamus B) Heart
C) Eyes D) JGA
 
Answer & Explanation Answer: C) Eyes

Explanation: The functioning of the kidneys is efficiently monitored and regulated by the hormonal feedback mechanisms involving the hypothalamus, JGA, and to a certain extent, the heart.

View Answer Discuss

Category: School MCQs
Sub Category: Class 11 Biology Mcqs

186
Q:

Which among the following is incorrect about different saccharides?

A) Polysaccharides are used to store food whereas most of the monosaccharides are used for instantaneous energy B) Most of the polysaccharides are sweet in taste and therefore are also called sugars
C) Starch can be digested whereas cellulose can’t be digested D) Saccharides are also classified as ketose and aldose
 
Answer & Explanation Answer: B) Most of the polysaccharides are sweet in taste and therefore are also called sugars

Explanation: Polysaccharides are used to store food whereas most of the monosaccharides are used for instantaneous energy. Most of the monosaccharides and disaccharides are sweet in taste whereas polysaccharides don’t taste sweet. Starch can be digested whereas cellulose can’t be digested. Saccharides are also classified as ketose and aldose.

View Answer Discuss

Category: School MCQs
Sub Category: Class 11 Biology Mcqs

184
Q:

Which of these hormones would be rapidly secreted in a man if he was being chased by a dog?

A) Somatostatin B) Somatotropin
C) Epinephrine D) Prolactin
 
Answer & Explanation Answer: C) Epinephrine

Explanation: Epinephrine or adrenaline is an emergency hormone that is rapidly secreted during stressful or emergency situations, such as when a man is being chased by a dog. It is secreted by the adrenal cortex.

View Answer Discuss

Category: School MCQs
Sub Category: Class 11 Biology Mcqs

181
Q:

Theodore Schwann was a _____

A) British zoologist B) German zoologist
C) British botanist D) German botanist
 
Answer & Explanation Answer: A) British zoologist

Explanation: Theodore Schwann was a British zoologist. He studied various types of animal cells. From his findings, the concluded that every cell had a thin outer layer which is the plasma membrane.

View Answer Discuss

Category: School MCQs
Sub Category: Class 11 Biology Mcqs

167
Q:

By counting the number of which of the following waves, the heartbeat of a person can be determined?

A) P-wave B) QRS complex
C) ST-segment D) PQ interval
 
Answer & Explanation Answer: B) QRS complex

Explanation: By counting the number of QRS complexes that occur in a given period, one can determine the heartbeat rate of an individual. Any deviation from the shapes of the curve indicates a possible abnormality or a disease. Hence, it is of great clinical significance.

View Answer Discuss

Category: School MCQs
Sub Category: Class 11 Biology Mcqs

167