CBSE Questions for Class 10 Biology Life Processes Quiz 12 - MCQExams.com

$$\textbf{Correct option: B}$$

$$\textbf{Solution:}$$

Option B:

$$\bullet$$ ATP (Adenosine Triphosphate) is the energy currency of cells that means it releases energy when gets broken down.

$$\bullet$$ ATP splits into one phosphate ion and one ADP (Adenosine Diphosphate) molecule while releasing energy.

$$\bullet$$ ATP is actually an Adenine nucleotide to which two more phosphates are attached.

$$\bullet$$ The energy is stored in the covalent bonds formed between phosphate groups. The energy present between second and third phosphate is approximately equal to 7kcal per mole.

$$\bullet$$ That's why, when ATP splits into one phosphate and one ADP molecule, the bond between second and third phosphates gets broken down that release the maximum amount of energy.

Hence the correct option is option B.

• The principal excretory organs of our body are the kidneys which maintain the chemical composition of the blood. 
• The kidneys are responsible for maintaining the chemical composition of the blood by the removal and absorption of the various salts, amino acids, glucose, and ions. 
• Thus, the kidney is known as the master chemist of our body.
  

A. Correct option –  D

B. Explanation for correct option – 

Double circulation means when the blood passes through the heart twice - E.g. Birds and mammals( including humans). 

Fishes have heart with two chambers and the circulation is unidirectional and closed circulatory system . 

Hence option D is correct

$$\textbf{Correct option: }$$ A

$$\textbf{ Solution: }$$

$$\textbf{ Option (a): }$$

$$\bullet$$An idioblast is considered as the isolated plant cells.  

$$\bullet$$These cells contains various function such as storage of reserves, excretory materials, pigments, oil, latex, gum, resin, and tannin. 

$$\textbf{ Option (b,c): }$$

$$\bullet$$Cell inclusions are cytoplasmic molecular aggregates. 

$$\bullet$$These aggregates can be pigments organic polymers and crystal. 

$$\bullet$$For example, Fat droplets and glycogen granules. 

The cell with or without inclusion are not considered to be the idioblast. 

$$\textbf{ Option (d): }$$

$$\bullet$$A cell organelle is defined to be the subcellular structure which is responsible for performing different functions such as mitochondria. 

Hence, the correct answer is option (a).

• Peristaltic movement occurs along the esophagus that helps in the movement of food in the digestive tract. 
• There are around 150,000 to 450,000 platelets in the blood. These are involved in the formation of blood clots. 
• Rings of cartilage are present in the trachea. This prevents the airway from collapsing during pressure changes of breathing.

• The brain forms only 2% of the body but uses up to 20% of the Oxygen. 
• It is given  top priority during the distribution of Oxygen-rich blood. 
• The internal carotid arteries and vertebral arteries carry Oxygen-rich blood from the heart to the brain. 

• The food is processed in the leaves through which it first travels to the main stem and then is distributed in other parts of the plant.
• The food reserves are transported to the new tuber maximally and not to the old tubers since old tubers contain adequate food storage. And the brands focus on transferring the food to the newly developing tubers. 

High blood pressure (hypertension) is a condition in which the force of the blood against the artery walls is too high. High blood pressure can cause blood vessel damage that leads to heart disease, kidney disease, stroke, and other problems. 

Reacting to stress in high blood pressure can increase the risk of heart attacks and strokes due to the increase of blood flow in blood vessels. 

So, avoiding stress is one of the precautions for persons having high blood pressure.

 Hence, the correct answer is option D.

$$\textbf{Correct Option B}$$

$$\textbf{Solution}$$

$$\bullet$$The Wharton's duct which is also known as the submandibular duct is one of the most important salivary ducts present in our mouth.

• Chlorophylls are the special pigments that absorb light, usually sunlight. The energy absorbed from light is transferred to energy-storing molecules. Through photosynthesis, the plant uses the stored energy to convert carbon dioxide and water into glucose molecules. 
• Photosynthesis is a process in which light energy is converted into chemical energy in the form of sugars.