- ALoop of Henle
- BDistal convoluted tubule
- CCollecting duct
- DProximal convoluted tubule
The proximal convoluted tubule (PCT) is the primary site for selective reabsorption of essential substances such as glucose, amino acids, salts, and a large amount of water from the filtrate back into the blood.
More Questions on Life Processes
1What is the consequence of consuming alcohol on the functioning of the liver?
→ 2Which enzyme is responsible for the digestion of proteins in the stomach?
→ 3Why are decomposers essential for the continuation of life processes in an ecosystem?
→ 4In humans, where does the majority of enzymatic digestion and absorption of nutrients take place?
→ 5Which of the following is an example of an endothermic organism?
→ 6How do plants manage their excretory needs, considering they lack a specialized excretory system?
→ 7If the bile duct is blocked, what immediate effect would this have on the digestion of fats?
→ 8Which component of blood is responsible for defending the body against infections?
→ 9Why is it crucial for blood to follow a "double circulation" pathway in humans?
→ 10A scientist compares the rate of photosynthesis in two identical plants. Plant A is exposed to white light, while Plant B is exposed to green light of the same intensity. Which plant would likely show a higher rate of photosynthesis and why?
→ 11What is the function of the glomerulus in the nephron?
→ 12How do terrestrial plants exchange gases for respiration?
→ 13Describe the role of hydrochloric acid in the human stomach.
→ 14A doctor advises a patient to reduce their salt intake due to high blood pressure. How does high salt intake contribute to high blood pressure?
→ 15Which of the following scenarios would lead to the fastest rate of transpiration in a plant?
→ 16Why is the total energy yield of aerobic respiration much higher than that of anaerobic respiration?
→ 17In a biology experiment, a student places a plant under a bell jar with soda lime. Soda lime absorbs carbon dioxide. What would be the immediate effect on the plant's photosynthetic rate?
→ 18Why is it important for the human body to maintain a relatively constant internal temperature (homeostasis)?
→ 19What is the primary function of the renal artery and renal vein in relation to the kidney?
→ 20Explain the process of "guttation" in plants and why it occurs.
→ 21Assertion (A): Blood in arteries is always oxygenated. Reason (R): Arteries carry blood away from the heart to different organs.
→ 22If the transpiration rate in a plant is very high, how would this affect the concentration of minerals in the xylem sap?
→ 23Why is it advantageous for an amoeba to have a pseudopodia-based mode of nutrition?
→ 24What is the significance of the diaphragm in human respiration?
→ 25Which of the following is a direct product of the light-dependent reactions of photosynthesis?
→ 26Describe the role of valves in the human heart.
→ 27What would be the effect on digestion if the pancreas failed to secrete its digestive enzymes?
→ 28Why are carbohydrates stored as starch in plants and as glycogen in animals?
→ 29Which of the following is the correct sequence of parts through which urine passes in the human excretory system?
→ 30If a plant's roots are deprived of oxygen, how would this immediately affect its ability to absorb water and minerals?
→ 31A patient is diagnosed with kidney failure and undergoes dialysis. Explain the principle behind artificial kidney (dialysis) treatment.
→ 32Assertion (A): Veins have valves while arteries do not. Reason (R): Valves in veins prevent the backflow of blood, especially against gravity, as blood pressure is low in veins.
→ 33Which part of the digestive system absorbs the maximum amount of water from undigested food?
→ 34What is the primary role of guard cells in plant leaves?
→ 35Describe the role of gastric glands in the human digestive system.
→ 36A person experiences symptoms like yellowish skin and eyes, and dark urine. Which organ is most likely malfunctioning?
→ 37Which of the following processes in plants requires energy (ATP) for the movement of substances?
→ 38Why is the left ventricle of the human heart thicker and more muscular than the right ventricle?
→ 39What happens to excess amino acids in the human body?
→ 40Explain how the large surface area for gas exchange is achieved in human lungs.
→ 41Why do aquatic organisms breathe much faster than terrestrial organisms?
→ 42A student observes that a healthy potted plant, when watered appropriately, still shows wilting during the hottest part of a summer day. Which process is most likely occurring at a higher rate than water absorption?
→ 43Which of the following is a primary function of xylem tissue in plants?
→ 44What would happen if the epiglottis failed to function properly during swallowing?
→ 45Why is it essential for plants to have stomata?
→ 46Assertion (A): Anaerobic respiration releases less energy than aerobic respiration. Reason (R): In anaerobic respiration, glucose is not completely broken down in the absence of oxygen.
→ 47Which of the following is an adaptation of the small intestine for efficient absorption of digested food?
→ 48A student observes a plant kept in a sealed transparent container. After some time, droplets of water appear on the inner surface of the container. What biological process is demonstrated here?
→ 49What would be the likely consequence if a person's lymphatic system were severely impaired?
→ 50Name the substance that prevents blood clotting inside the human body.
→ 51Why do walls of the trachea have C-shaped cartilaginous rings?
→ 52In an experiment, if a plant is defoliated (leaves removed), how would this immediately affect the rate of water absorption by its roots?
→ 53Which of the following statements correctly describes the role of bile in the digestion of food?
→ 54During vigorous exercise, muscles may respire anaerobically. What is the end product of anaerobic respiration in human muscles, and what is its consequence?
→ 55A person suffers from a condition where their blood is unable to clot effectively after an injury. Which component of the blood is most likely deficient or malfunctioning?
→ 56Assertion (A): Human beings have a double circulatory system. Reason (R): In a double circulatory system, blood goes through the heart twice during each cycle, once for pulmonary circulation and once for systemic circulation.
→ 57Why is the inner lining of the small intestine folded into numerous finger-like projections called villi?
→ 58A student performs an experiment to study photosynthesis. They keep a potted plant with variegated leaves (some parts green, some non-green) in a dark room for 48 hours and then expose it to sunlight for 6 hours. After performing the iodine test, which part of the leaf would show the presence of starch and why?
→ 59Which of the following processes in plants involves the movement of water and dissolved minerals from the roots to the leaves against gravity?
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