NARAYANKAR NOTES

  14. Human Nutrition ANSWER KEY  SECTION A – MCQs (1 Mark Each) 1. Acinar cells are present in pancreas. • Acinar cells are exocrine cells of the pancreas. • These cells secrete digestive enzymes into the pancreatic duct. 2. Molars are maximum in number in human buccal cavity. • An adult human has twelve molars in total. • Molars are more in number compared to incisors, canines, and premolars. 3. Talking is not a digestive function of the tongue. • Talking is related to speech and communication. • Taste, swallowing, and mixing food with saliva are digestive functions. 4. Pepsin is a protease enzyme. • Pepsin helps in the digestion of proteins. • Protease is an enzyme that breaks down proteins into simpler substances. 5. Pepsin works best in acidic medium. • Pepsin functions effectively at a pH of about 1.5 to 2. • The acidic environment of the stomach activates pepsin. SECTION B – Short Answer (3 Marks Each) 1. Why was Shiv adv...

   14. Human Nutrition  Total Marks: 50      Time: 2 Hours                       SECTION A   Q.1 Multiple Choice Questions.           (5 Marks) 1. Acinar cells are present in: a) Liver b) Pancreas c) Gastric glands d) Intestinal glands 2. Which type of teeth are maximum in number in human buccal cavity? a) Incisors b) Canines c) Premolars d) Molars 3. Select the odd one out based on digestive function of tongue: a) Taste b) Swallowing c) Talking d) Mixing saliva in food 4. Complete the analogy: Ptyalin : Amylase :: Pepsin : ______ a) Lipase b) Galactose c) Proenzyme d) Protease 5. Which enzyme works best in acidic medium? a) Salivary amylase b) Trypsin c) Pepsin d) Nucleotidase                       SECTION B  Q.2 Short Answer Questions (Any 3)  ...

  Answer Key: Hydrocarbons Date: 16/02/2026 | Total Marks: 100 SECTION A: ONE LINE QUESTIONS (25 Marks) Scoring: 2 points per answer (1 mark each) 1. Define Hydrocarbons. • Hydrocarbons are defined as organic compounds that contain only carbon and hydrogen as their constituent elements. • They are broadly classified into open-chain (aliphatic) and cyclic structures. 2. What is the general formula for Alkanes? • The general molecular formula for the alkane series is C n H 2n+2 . • In this formula, 'n' represents the number of carbon atoms present in the molecule. 3. Why are alkanes called 'paraffins'? • Alkanes are referred to as paraffins because they exhibit very low chemical reactivity. • The term "paraffin" is derived from their low affinity for reacting with other chem...

    Genius Science Academy  TEST PAPER: HYDROCARBONS Time: 3 Hours | Marks: 100 | Date: 16/02/2026 SECTION A: ONE LINE QUESTIONS (25 Marks) Answer all questions. (1 mark each) Define Hydrocarbons. What is the general formula for Alkanes? Why are alkanes called 'paraffins'? State the hybridization of carbon atoms in Alkenes. What is the C-C bond length in Alkanes? Define 'Isomerism'. What is the general formula for Alkynes? Define 'Conformations'. What is a 'Torsion angle'? Name the parent compound of the entire family of aromatic compounds. What is the common name for Alkenes? Give the IUPAC name of the first member of the Alkyne series. State Huckel’s Rule for aromaticity. Which alkane is the major product in...

  Photosynthesis – Section A Answer Key SECTION A – (1 Mark Each) 1) Define Photosynthesis with balanced equation Photosynthesis is the process by which green plants synthesize glucose from carbon dioxide and water using light energy. Balanced Equation: 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6O₂ + 6H₂O. 2) Difference between Chlorophyll-a and Chlorophyll-b Chlorophyll-a contains a methyl (–CH₃) group. Chlorophyll-b contains an aldehyde (–CHO) group. 3) Define Quantum Energy Quantum energy is the minimum amount of energy required to excite an electron. It is carried in the form of a photon of light. 4) Primary function of Accessory Pigments They absorb light of different wavelengths. They transfer absorbed energy to chlorophyll-a. 5) Name the ground substance of chloroplast The ground substance is called stroma. It contains enzymes required for the dark reaction. 6) Location of photosynthetic pigments Photosynthetic pigments are present in the...

  ✅ SECTION – A (2 Points Each – Each point is a full sentence.) 1. What does the abbreviation ‘redox’ stand for? Redox stands for reduction and oxidation. It represents reactions in which oxidation and reduction occur simultaneously. 2. Define oxidation according to the classical concept. Oxidation is defined as the addition of oxygen to a substance. It is also defined as the removal of hydrogen from a substance. 3. Define oxidation in terms of electron transfer. Oxidation is the loss of electrons by an atom or ion. It results in an increase in oxidation number. 4. Define reduction in terms of electron transfer. Reduction is the gain of electrons by an atom or ion. It results in a decrease in oxidation number. 5. Define an oxidising agent in terms of oxidation number. An oxidising agent is a substance that increases the oxidation number of another substance. It itself undergoes reduction during the reaction. 6. Define a reducing agent in terms...