CBSE Questions for Class 10 Biology Life Processes Quiz 11 - MCQExams.com

$$\textbf{Correct Option B}$$

$$\textbf{Solution}$$

 $$\textbf{ A-Superior vena cava}$$         $$\textbf{ r- Brings deoxygenated blood form upper parts of the body to the right atrium.}$$  

$$\bullet$$ A large vein that carries blood to the heart from other areas of the body. The superior vena cava carries blood from the head, neck, arms, and chest. Brings deoxygenated blood from upper parts of the  body into the right atrium.

 $$\textbf{ B-Inferior vena cava}$$        $$\textbf{ r- Brings deoxygenated blood form lower parts of the body to the right atrium.}$$    

$$\bullet$$ The inferior vena cava is a large vein that carries the deoxygenated blood from the lower and middle body into the right atrium of the heart. It has the largest diameter of the venous system and is a thin-walled vessel.

 $$\textbf{ C- Pulmonary artery}$$        $$\textbf{ p-carries deoxygenated blood to lungs}$$  

$$\bullet$$  The pulmonary arteries carry blood from the right side of the heart to the lungs. It divides into the left and right pulmonary arteries, which carry blood with relatively low oxygen content and high carbon dioxide content into the lungs.

 $$\textbf{ D- Pulmonary vein}$$        $$\textbf{ s- brings oxygenated blood to the left atrium}$$  

$$\bullet$$ The pulmonary veins are the veins that transfer oxygenated blood from the lungs to the heart. The veins do the opposite job of pulmonary arteries and collects the oxygenated blood and carry it from the lungs back to the heart. The veins merge into larger veins. Each lung has two pulmonary veins that deliver blood to the heart's top left chamber or atrium.

So, the correct sequence is A-t, B-r, C-p, D-s., which is B . 

• Bile is alkaline (pH = 7.0-7.4) and has the function of neutralizing any excess acidic pH due to the presence of gastric acid in food before it enters the duodenum. 
• Therefore, food becomes alkaline when gets in contact with bile. 
• Thus, the correct answer is option B.

• All the living organism perform life maintaining process is called as a life process. It is the sequence of mechanisms for survival of organisms. 
• There are 7 essential life processes such as reproduction, nutrition, movement, growth, excretion, respiration and sensitivity. 
• Thus, the correct answer is option D.

• In birds and mammals, it is essential to keep the oxygenated blood separated from the deoxygenated blood.
• Birds and mammals are warm-blooded animals. Their energy requirement is high as they need the energy to maintain constant body temperature.
• By keeping them separate, only oxygenated blood is sent out to the body's tissues for far more efficient diffusion into the cells of the body, giving them more 'fuel' to run cellular respiration in the mitochondria, to make ATP molecules run the reactions that allow them to maintain body temperature in addition to running all of their metabolic reactions of the body. 
• If they were not separated, it would probably take much longer to perform simple activities and metabolism would be reduced as a consequence.
• So, the correct answer is option C. 

• Artificial kidneys contain several tubes. 
• Each tube contains a semi-permeable lining that remains suspended in a tank filled with a dialyzing fluid having the same osmotic pressure as blood.
• The patient's blood is passed through these tubes. 
• Only selective products such as waste products (urea) pass through the semi-permeable membrane from the blood to the dialysing fluid.
• The purified blood is sent back into the patient's body.

• The epiglottis is an elastic cartilage covered with a mucous membrane located at the entrance of the larynx and the base of the tongue. It is shaped like a leaf and guards the entrance of the glottis (the opening between the vocal cords). 
• When we swallow food, the epiglottis folds over the glottis to stop liquid and food from entering the trachea. Thus, food goes right to the esophagus so that one would not get choked.
• So, the correct answer is option C.

• A pair of human kidneys are the major organs for excretion.
• They are bean-shaped organs located on either side of the backbone at about the level of the stomach and liver. 
• Paired tubes called ureters carry waste products from the kidneys to the urinary bladder for storage till micturition.
  
• During micturition, urine is excreted through the urethra.

The kidneys in the human body are the main excretory organs responsible for filtering out nitrogenous wastes from the blood. The bean-shaped organs are found in pairs in the abdomen, one on either side of the backbone near the waist.

So, the correct answer is option D.

• The combination of oxygen with haemoglobin is called oxyhaemoglobin and this oxygenated blood is carried away from the lungs through the bloodstream to all the tissues of the body. 
• Carbon monoxide can also bind to haemoglobin but does so about 240 times more tightly than oxygen, forming a compound called carboxyhaemoglobin. 
• This means that if both carbon monoxide and oxygen are inhaled, carbon monoxide will preferentially bind to haemoglobin. 
• This reduces the amount of haemoglobin available to bind to oxygen, so the body and tissues become starved of oxygen.

• During systole, because of heart contraction blood is pumped into arteries.
•  Blood pressure is highest as it leaves the heart through the aorta and gradually decreases as it enters smaller and smaller blood vessels (arteries, arterioles, and capillaries). 
• While during atrial diastole, both atria are relaxing, dilating and filling. 
• Blood pressure drops to the lowest level during this state. 

• The deoxygenated blood first enters the heart into the right atrium. 
• Blood passes from the right atrium through the tricuspid valve into the right ventricle. 
• When the right ventricle contracts, the muscular force pushes blood through the pulmonary semilunar valve into the pulmonary artery.

The lymphatic system is responsible for returning excess interstitial fluid to the blood. Of the fluid that leaves the capillary, about 90 per cent is returned. The 10 per cent that does not return becomes part of the interstitial fluid that surrounds the tissue cells. It helps in the exchange of gases, nutrients and removes metabolic waste. 

So, the correct answer is option A.