Which of the following represents the correct sequence of blood flow in human double circulation? a. Right Atrium, Right Ventricle, Lungs, Left Atrium, Left Ventricle, Body Tissue b. Left Atrium, Left Ventricle, Lungs, Right Atrium, Right Ventricle, Body Tissue c. Right Ventricle, Right Atrium, Lungs, Left Ventricle, Left Atrium, Body Tissue d. Body Tissue, Left Atrium, Left Ventricle, Lungs, Right Ventricle, Right Atri
Breakdown of pyruvate to yield carbon dioxide, water, and energy takes place in the: a. Cytoplasm b. Mitochondria c. Chloroplast d. Endoplasmic Reticulum
The blood vessel that carries oxygenated blood from lungs back to the heart is the: a. Pulmonary Artery b. Pulmonary Vein c. Superior Vena Cava d. Aorta
Major site of selective reabsorption of amino acids and glucose in a human nephron is the: a. Bowman’s Capsule b. Proximal Convoluted Tubule (PCT) c. Distal Convoluted Tubule (DCT) d. Loop of Henle
Secretion of pancreatic enzymes is stimulated when acidic chyme enters the: a. Stomach b. Duodenum c. Oesophagus d. Large Intestine Directions: For following questions select: Both Assertion (A) and Reason (R) are true and R is the correct explanation of A. Both Assertion (A) and Reason (R) are true, but R is NOT the correct explanation of A. Assertion (A) is true, but Reason (R) is false. Assertion (A) is false, but Reason (R) is true.
Assertion (A): The rate of breathing in aquatic organisms is much faster than in terrestrial organisms. Reason (R): The concentration of dissolved oxygen in water is fairly low compared to the concentration of oxygen in atmospheric air.
Assertion (A): Human heart possesses four distinct chambers to prevent mixing of oxygenated and deoxygenated blood. Reason (R): Complete separation of blood allows highly efficient supply of oxygen needed for thermoregulation in endothermic animals.
Assertion (A): Chemical digestion of carbohydrates does not occur in the human stomach. Reason (R): Hydrochloric acid creates a highly acidic environment which denatures and inactivates salivary amylase enzyme.
Assertion (A): Transpiration pull is the primary driving force for water movement in tall trees during the daytime. Reason (R): Stomata remain open during daytime, facilitating continuous evaporation of water from leaf mesophyll cells.
Assertion (A): Glomerular ultrafiltration is a non-selective pressure filtration process. Reason (R): Bowman’s capsule filtration membrane permits small molecules like glucose, urea, and salts to pass while retaining blood cells and plasma proteins. Section A: Short Answer Type (Two Marks)
Define ‘autotrophic nutrition’. Elaborate its type also.
What is the precise function of mucus secreted by the gastric glands in the human stomach?
Name the enzyme present in human saliva that hydrolyzes starch into maltose.
Name the specific subcellular location where anaerobic respiration occurs in yeast cells during fermentation.
Which structural component prevents the human trachea from collapsing when air pressure inside drops?
Name the microscopic sac-like structural and functional units of human lungs where gaseous exchange takes place.
State the physiological function of the bicuspid (mitral) and tricuspid valves in the human heart.
Name the main nitrogenous waste product filtered from human blood by the kidneys.
What is the normal systolic and diastolic blood pressure reading of a healthy adult human in
Name the complex permanent vascular tissue responsible for the translocation of photosynthetic products in plants.
Define ‘transpiration pull’.
What chemical reagent is used to test for the presence of starch in a destarched leaf experiment?
Name the respiratory iron-containing protein present in human red blood cells that binds oxygen.
Which chamber of the four-chambered human heart receives freshly oxygenated blood directly from the pulmonary veins?
State the role of guard cells in regulating the opening and closing of stomatal pores.
Name the organic 3-carbon byproduct formed when pyruvate is broken down anaerobically in human skeletal muscle cells during sudden, heavy exercise.
Define the term ’emulsification’ of dietary fats.
Name the plant excretion process by which metabolic wastes like resins and gums are stored in older non-functional xylem tissue.
Name the precise region of the nephron where maximum selective reabsorption of glucose, amino acids, and salts occurs.
What is the average volume of initial glomerular filtrate produced daily in an adult human?
Differentiate between autotrophic and heterotrophic nutrition with one example of each.
Why do herbivorous animals (like cows) possess a significantly longer small intestine than carnivorous animals (like tigers)?
Describe two distinct roles played by Hydrochloric Acid in the human stomach during digestion.
Why is simple diffusion insufficient to meet the oxygen requirements of large multicellular organisms like humans?
Explain why the rate of breathing in aquatic organisms (like fishes) is much faster than that in terrestrial organisms (like humans).
Write the balanced chemical equation for photosynthesis, indicating all necessary essential conditions above and below the arrow.
Distinguish between aerobic and anaerobic respiration based on location within the cell, oxygen requirement, and total ATP yield per glucose molecule.
Describe two major physiological functions performed by the human lymphatic system.
Differentiate between Arteries and Veins in terms of vessel wall thickness, elasticity, and presence of internal valves.
Explain why complete double circulation is essential in warm-blooded animals like mammals and birds.
How do stomatal pores open and close? Describe the mechanism involving water movement and guard cell turgidity.
Name the three major digestive enzymes present in pancreatic juice and state the specific substrate each acts upon.
Define Root Pressure. How does it contribute to the movement of water in small herbaceous plants early in the morning?
Describe the role of bile juice in digestion. Why is it vital for fat digestion even though it contains no digestive enzymes?
What causes severe muscle cramps after intense physical activity like sprinting? Write the biochemical pathway involved.
Explain the function of blood platelets (thrombocytes) at the site of a vascular injury.
State two distinct methods utilized by plants to excrete or eliminate their metabolic waste products.
Describe the two main physiological processes involved in ultrafiltration occurring inside Malpighian corpuscles (Glomerulus + Bowman’s Capsule).
Why do ventricles have significantly thicker, more muscular walls than atria in the human heart?
Differentiate between Xylem transport (ascent of sap) and Phloem transport (translocation) based on direction of flow and ATP energy requirement.
Short Answer Type (Three Marks)
Explain the three major events that occur during photosynthesis. Is it mandatory that these steps take place one after another in immediate succession? Explain with reference to desert plants (CAM plants).
Trace the step-by-step path taken by a molecule of oxygen from inhaled atmospheric air in nostrils until it reaches systemic tissue capillaries.
Draw a neat, step-by-step labelled flowchart illustrating the three distinct pathways of glucose breakdown (Aerobic respiration, Anaerobic respiration in yeast fermentation, and Anaerobic pathway in muscle tissue).
Explain the process of digestion in the human small intestine, detailing the action and substrate outcomes of bile juice, pancreatic juice, and intestinal enzymes.
Describe an experiment step-by-step to demonstrate that carbon dioxide ($CO_2$) is essential for photosynthesis, clearly mentioning the role of potassium hydroxide ($KOH$).
Trace the detailed pathway of blood circulation through the four chambers of the human heart, clearly delineating Pulmonary and Systemic circulation loops.
How does translocation of food take place in phloem? Explain the role of osmotic pressure and ATP energy according to the Mass Flow Hypothesis.
Draw a neat, well-labelled diagram of a single Nephron and label: Glomerulus, Bowman’s Capsule, Proximal Convoluted Tubule (PCT), Loop of Henle, Distal Convoluted Tubule (DCT), and Collecting Duct.
Explain the mechanical physiology of inhalation and exhalation involving the movement of the rib cage, intercostal muscles, and diaphragm.
Discuss the role of hemoglobin in human respiration. What health complications arise when a person suffers from severe iron-deficiency anemia?
Describe how succulent desert plants modify their stomatal behavior and biochemical steps to carry out photosynthesis without suffering severe dehydration.
Explain the basic principle and working steps of Hemodialysis (Artificial Kidney machine) used for patients with acute renal failure.
Differentiate clearly between external respiration (breathing) and cellular respiration in terms of site of occurrence, energy release, and cellular machinery involved.
How do root hair cells absorb water and mineral ions from the soil? Explain the roles of active ion uptake and resulting osmotic gradients across the root cortex.
Describe the histological structure and function of gastric glands located in the human stomach wall, detailing their three major chemical secretions.
Explain how the human respiratory system (alveoli) is structurally optimized to maximize the surface area for rapid gas diffusion.
What is ‘residual volume’ of air in human lungs, and why is its presence physiologically critical for continuous gas exchange?
Compare the evolutionary heart structures and circulatory patterns across Fishes (2-chambered), Amphibians/Reptiles (3-chambered), and Birds/Mammals (4-chambered).
Explain why sleeping under a tree at night is discouraged, referencing plant respiratory gas exchange versus photosynthetic activity.
Explain the process of urine formation in a human nephron by summarizing three main steps: Ultrafiltration, Selective Reabsorption, and Tubular Secretion.
Long Answer & Diagram/Experimental Questions (Five Marks Each)
Anwer the following a. Draw a neat, labeled diagram of the human digestive system. b. Describe in detail the digestion of carbohydrates, proteins, and fats taking place in the stomach and small intestine, mentioning all enzymes involved.
Anwer the following a. Draw a schematic diagram showing double circulation in human beings. b. Explain why systemic blood pressure is significantly higher in arteries than in veins, and describe how capillary wall structure facilitates rapid nutrient exchange.
Anwer the following a. Draw a labeled diagram of the human respiratory system. b. Describe alveolar gas exchange with surrounding pulmonary capillaries, explaining how concentration/partial pressure gradients drive $O_2$ and $CO_2$ movement.
Anwer the following a. Describe an experimental setup with a neat diagram to prove that light is essential for photosynthesis. b. Why is a potted plant destarched before starting photosynthesis experiments, and how is destarching accomplished?
Anwer the following a. Draw a well-labeled diagram of the human excretory system. b. Explain the role of kidneys in osmoregulation and describe how antidiuretic hormone (ADH) regulates urine volume and concentration based on hydration levels.
Anwer the following a. Explain how ascent of sap occurs in tall plants during the daytime through a combination of transpiration pull, cohesion, and adhesion of water molecules. b. Differentiate between transpiration and translocation in plants across four distinct parameters (tissue involved, substance moved, energy requirement, direction).
Trace the complete digestion journey of a protein-rich meal (e.g., egg white) from ingestion in the mouth to final absorption in the small intestine villi, detailing all enzymes (pepsin, trypsin, peptidases), optimum pH environments, and final end products.
Anwer the following a. Describe an experimental setup using germinating seeds and a test tube of $KOH$ solution inside a closed respirometer to prove that seeds release $CO_2$ during respiration. b. Explain the gas dynamic mechanism that causes fluid level to rise in the connected U-tube manometer.
Anwer the following a. Draw a schematic diagram of the human heart showing internal chambers, valves, septum, and connected major vessels (aorta, vena cava, pulmonary artery, pulmonary vein). b. Describe the three phases of the cardiac cycle (Atrial Systole, Ventricular Systole, Joint Diastole) and explain how heart sounds (“LUBB” and “DUPP”) are generated.
Anwer the following a. Describe the structure of a stomatal apparatus with a neat labeled diagram showing guard cells, stomatal pore, chloroplasts, and epidermal cells. b. Explain how environmental factors like light intensity, temperature, and atmospheric CO2 concentration influence stomatal opening and closing.
Anwer the following a. Differentiate between saprotrophic, parasitic, and holozoic modes of heterotrophic nutrition with two suitable examples for each mode. b. Describe holozoic nutrition in Amoeba with step-by-step labeled diagrams from ingestion via pseudopodia to egestion.
Anwer the following a. Define Hypertension. List its major underlying causes and potential systemic risks to human health if left untreated. b. Explain the functional significance of coronary arteries and describe the physiological event that occurs during myocardial infarction (heart attack).
Anwer the following a. Compare the excretory strategies of plants versus animals across raw materials, energy investment, excretory structures, and final elimination modes. b. Explain how plants store or eliminate gaseous, liquid, and solid waste products.
Anwer the following a. Describe the transport mechanisms of O_2 (oxyhemoglobin) and CO_2 (as bicarbonate ions, carbaminohemoglobin, and dissolved gas in plasma) in human systemic and pulmonary circulation. b. Explain why carbon monoxide (CO) poisoning is lethal even when adequate oxygen is present in the atmosphere.
Anwer the following a. Describe an experiment to demonstrate that chlorophyll is essential for photosynthesis using a variegated leaf (e.g., Coleus or Croton). b. Explain the chemical logic behind boiling the leaf in alcohol using a water bath prior to performing the iodine test. Higher Order Thinking Skills (HOTS) Questions
A patient undergoes surgical removal of their gallbladder (cholecystectomy). How will this surgical procedure impact their digestion of dietary lipids, and what specific dietary adjustments must they adopt? Explain.
If a tree trunk is completely girdled (removing a ring of outer bark down to the phloem layer while leaving xylem intact), xylem transport continues normally while phloem transport halts immediately. Explain why the trunk region directly above the cut swells and why the tree roots eventually die.
An athlete breathes much faster and deeper for several minutes after finishing a 100-meter sprint race, even though the physical activity has ceased. Explain the physiological concept of “oxygen debt” and lactic acid conversion in the liver.
If the luminal diameter of the afferent arteriole entering the glomerulus were made smaller than that of the efferent arteriole leaving it, how would ultrafiltration and glomerular filtration rate (GFR) be affected? Explain.
Why is glucose present in significant amounts in the initial glomerular filtrate inside Bowman’s capsule, but completely absent in normal, healthy human urine? What does the presence of glucose in urine (glucosuria) indicate clinically? Why do human beings excrete significantly larger volumes of dilute urine during cold winter months compared to hot summer months, even when daily fluid intake remains constant?
If a newborn infant is diagnosed with a congenital hole in the inter-ventricular septum (“ventricular septal defect”), what immediate physiological symptoms will the child display, and why?
Why do yeast cells switch from aerobic respiration to alcoholic fermentation when placed in a highly concentrated sugar solution, even if ample oxygen gas is dissolved in the medium (Crabtree Effect)?
Desert plants keep their stomatal pores tightly closed during the daytime to prevent transpiration. How do they absorb atmospheric CO_2$needed for photosynthesis without undergoing fatal water loss?
A person regularly consumes high doses of antacid tablets to treat chronic stomach hyperacidity, raising their gastric pH above 6.0. How will this affect protein digestion in their stomach?
a. Draw a neat and labeled diagram of the human digestive system. b. Describe the digestion of food taking place in the stomach and small intestine, mentioning the specific enzymes involved and their respective functions.
a. Explain the three distinct pathways of glucose breakdown in living organisms with the help of a neat flowchart. b. How are alveoli structurally designed in human lungs to maximize the surface area for exchange of gases?
(a) Describe the step-by-step route of blood flow through the four chambers of the human heart, clearly mentioning the connected blood vessels. (b) Define double circulation. Why is complete separation of oxygenated and deoxygenated blood necessary in warm-blooded animals like mammals and birds?
(a) Name the structural and functional unit of the human kidney. Draw a simple diagram of it and label four main parts. (b) Describe the three main physiological steps involved in urine formation inside the nephron.
(a) Write the balanced chemical equation for photosynthesis and list the three main events occurring during this process. (b) Explain how desert plants (CAM plants) modify their stomatal behavior and biochemical steps to carry out photosynthesis without undergoing severe water loss.
(a) Describe the physical mechanism of inhalation and exhalation in human beings involving the movement of the diaphragm, rib cage, and intercostal muscles. (b) Explain how net gaseous exchange in green plant leaves differs between daytime and nighttime.
