CBSE Questions for Class 10 Biology Life Processes Quiz 1 - MCQExams.com

Correct Option: C
Explanation:

• There is acid production in the stomach. Excess acid production may result in problems like indigestion of food which may result in vomiting. 
• Antacid acts by neutralizing the acid in the stomach. The antacid increases the pH of the stomach. 
• This helps the process of digestion to occur in normal conditions and treat problems like heartburn and flatulence. 
• Thus, the correct answer is option B. 

$$\textbf{Correct answer: A}$$ 

$$\textbf{Option (A):}$$ 

$$\bullet$$ The organisms which have the ability to produce their own food are called autotrophs.  

$$\bullet$$ Plants are called autotrophs because they can prepare their own food with the help of photosynthesis. Carbohydrate produced during photosynthesis is used as a nutrient in plant cells.

$$\textbf{Option (B):}$$ 

$$\bullet$$ If an organism is dependent on another organism for its nutrition completely, then they are called parasites. 

$$\bullet$$ The organisms on which parasites are dependent are called the hosts. 

$$\bullet$$ Parasites draw their nutrients directly from the host's body. 

$$\textbf{Option (C):}$$ 

$$\bullet$$ Heterotrophs are those organisms which do not have the ability to prepare their own food.

$$\bullet$$ This is why they depend on autotrophs for their food.

$$\textbf{Option (D):}$$ 

$$\bullet$$ Saprophytes are the specific organisms that feed on the dead and decaying organic matter. 

$$\bullet$$ It breaks down the complex component from the decaying matter to produce the simple molecules.

Hence, the correct answer is correct (A).

• The circulatory system is composed of the heart, blood, and blood vessels.
• Blood is the fluid connective tissue that helps in the transportation of food, ions, salts, hormones, and gases in the body. 
• The food that is digested in the digestive tract is absorbed by the intestinal walls of the small intestine and diffused into the blood. 
• This food is carried to different tissues of the body for absorption.
• The waste substances and ions generated by the cells of the tissues are excreted into the blood. Also, the blood carries oxygen.

• Erythrocytes, also known as red blood cells (RBCs), function to transport Oxygen in the blood. 
• They do so with the help of Haemoglobin, a respiratory pigment. 
• The shape and structure of Erythrocytes are ideal for this function. 
• They lack a nucleus and few other organelles so that maximum space in the cell can be used to accommodate Haemoglobin molecules. 
• Leucocytes are involved in immune response while Thrombocytes are involved in blood clotting. 
• Blood plasma does not contribute to O$$_2$$ transport. 
• Thus, option B is correct.

• Upward movement of water and minerals from roots is achieved by xylem vessels that run like pipes throughout the root, stem, branches, and leaves. They form a continuous passage for water and nutrients to reach the leaf. 
  
• Phloem is involved in the transportation of food. 
• Mesophyll cells are involved in photosynthesis. 
• Stomata are openings on the leaf surface through which the exchange of gases takes place. 
• So, the correct answer is option A.

• Xylem tracheids and vessels are the most important tissues involved in the transport of water in plants. 
• In case xylem is blocked, then water transport will be hindered. 
• This will lead to the reduction or lack of water supply to the different parts of the plant. 
• As a result the turgor pressure gradually reduces. This will lead to the loss of rigidity of cells and ultimately wilting.
  
• So, the leaves will droop down or wilt, causing the entire plant to wilt and die. 
• Thus, the correct answer is option A. 

• The suction of water and minerals due to transpiration pull is more rapid because the water molecules have a great mutual attraction with each other or in other words, they have tremendous cohesive power.

• The transpiration in plants leads to suction force in the xylem vessel.
• The suction force is strong enough to pull the water from the root to the leaves.
• This is called transpirational pull and can pull the water up to 100 m or more.
• This force is responsible for the transport of water in tall trees.
• Transpiration results in loss of water in vapour form. 
• So, the correct answer is option B.

$$\textbf{Correct Option C}$$

$$\textbf{Solution}$$

$$\bullet$$  $$\textbf{Option A}$$ All systemic arteries are branches, either directly or indirectly, from the aorta. It carries oxygenated blood from the left ventricle, through the arteries, to the capillaries in the tissues of the body.

$$\bullet$$ $$\textbf{Option B}$$  The liver has two blood supplies, the hepatic artery and the portal vein. The hepatic artery provides oxygen and nutrition. So, hepatic artery is the one which supplies oxygenated blood to the liver, pylorus of the stomach, duodenum, pancreas, and gallbladder.

 $$\bullet$$ $$\textbf{Option C}$$ The pulmonary artery carries from your heart to your lungs. It carries deoxygenated blood from the right side of the heart to the lungs. This is the only artery which carries deoxygenated blood,

$$\bullet$$ $$\textbf{Option D}$$  Cardiac artery also called, coronary arteries run along the coronary sulcus of the myocardium of the heart. Their main function is to supply blood to the heart.

So, the correct option is C.

• Animals and some plants cannot produce their own food and must obtain their nutrition from outside sources— these plants are heterotrophic. For example - dodder is a parasitic plant that derives nutrition from its host.
  
• Autophytes are plants that can manufacture their own food. 
• Halophytes are plants that grow in extremely saline conditions. 
• Holophytes are the organism that prepares their food by photosynthesis.

• A heart with four chambers has two atria and two ventricles.