Lesson Archives

  1. Page No 56: Question 1: Bar diagram is a (i) one-dimensional diagram (ii) two-dimensional diagram (iii) diagram with no dimension (iv) none of the above Answer: Bar diagrams are One-dimensional diagrams. These are represented on a plane of two axis and depicts the relationship between the two variables (plotted on the either axis) in form […]
  2. Page No 38: Question 1(i): The class midpoint is equal to: (a) The average of the upper class limit and the lower class limit. (b) The product of upper class limit and the lower class limit. (c) The ratio of the upper class limit and the lower class limit. (d) None of the above. Answer: […]
  3. Page No 20: Question 1(i): Which of the following is the most important when you buy a new dress? Answer: Which of the following is the most important when you buy a new dress? Colour Brand Price Size Page No 21: Question 1(ii): How often do you use computers? Answer: How often do you use […]
  4. Page No 341: Question 1: Define the following: (a) Exocrine gland (b) Endocrine gland (c) Hormone Answer: (a) Exocrine glands: Glands that discharge secretions into ducts are known as exocrine glands. Sebaceous gland in the skin, salivary gland in the buccal cavity, etc. are examples of exocrine glands. (b) Endocrine glands: Glands that do not […]
  5. Page No 328: Question 1: Briefly describe the structure of the following: Brain (b) Eye (c) Ear Answer: (A) Brain: Brain is the main coordinating centre of the body. It is a part of nervous system that controls and monitors every organ of the body. It is well protected by cranial meninges that are made […]
  6. Page No 313: Question 1: Draw the diagram of a sarcomere of skeletal muscle showing different regions. Answer: The diagrammatic representation of a sarcomere is as follows: Question 2: Define sliding filament theory of muscle contraction. Answer: The sliding filament theory explains the process of muscle contraction during which the thin filaments slide over the […]
  7. Page No 300: Question 1: Define Glomerular Filtration Rate (GFR) Answer: Glomerular filtration rate is the amount of glomerular filtrate formed in all the nephrons of both the kidneys per minute. In a healthy individual, it is about 125 mL/minute. Glomerular filtrate contains glucose, amino acids, sodium, potassium, urea, uric acid, ketone bodies, and large […]
  8. Page No 289: Question 1: Name the components of the formed elements in the blood and mention one major function of each of them. Answer: The component elements in the blood are: (1) Erythrocytes: They are the most abundant cells and contain the red pigment called haemoglobin. They carry oxygen to all parts of the […]
  9. Page No 277: Question 1: Define vital capacity. What is its significance? Answer: Vital capacity is the maximum volume of air that can be exhaled after a maximum inspiration. It is about 3.5 – 4.5 litres in the human body. It promotes the act of supplying fresh air and getting rid of foul air, thereby […]
  10. Page No 267: Question 1: Choose the correct answer among the following: (a) Gastric juice contains (i) pepsin, lipase and rennin (ii) trypsin lipase and rennin (iii) trypsin, pepsin and lipase (iv) trypsin, pepsin and renin (b) Succus entericus is the name given to (i) a junction between ileum and large intestine (ii) intestinal juice […]