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Chapter – 19 Chemical Coordination And Integration Q2. Which of the following hormones is not secreted by anterior pituitary? (a) Growth hormone (b) Follicle stimulating hormone (c) Oxytocin (d) Adrenocorticotrophic hormone Ans: (c) The pars distalis region of pituitary, commonly called anterior pituitary, produces 6 Growth Hormone (GH), Prolactin (PRL), Thyroid Stimulating Hormone (TSH), Adrenocorticotrophic … Read more
Chapter – 18 Neural Control and Coordination Q1. Briefly describe the structure of the following: Ear Answer :Ear: Ear is the sense organ for hearing and equilibrium. It consists of three portions external ear, middle ear, and internal ear. 1. External ear: It consists of the pinna, external auditory meatus, and a tympanic membrane. Pinna … Read more
Chapter – 17 Locomotion And Movement 1: Draw the diagram of a sarcomere of skeletal muscle showing different regions. Sol. The diagrammatic representation of a sarcomere is as follows: 2: Define sliding filament theory of muscle contraction. Sol. The sliding filament theory explains the process of muscle contraction during which the thin filaments slide over … Read more
Chapter – 16 Excretory Product and their Elimination 1. Define Glomerular Filtration Rate (GFR) Sol. 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, … Read more
Chapter – 14 Body Fluids And Circulation 1. Name the components of the formed elements in the blood and mention one major function of each of them. Solution: Blood corpuscles are the formed ele-ments in the blood, they constitute 45% of the blood. Formed elements are – (erythrocytes, RBCs or red blood corpuscles), (leucocytes, WBCs … Read more
Chapter – 14 Breathing And Exchaneg Of Glass Question 1. It is known that exposure to carbon monoxide is harmful to animals becauseIt destroys haemoglobin .It reduces CO2 transport. It increases O2 transport. It increases CO2 transport. Answer 1: The correct option is BEx planation of the correct option:Carbon monoxide destroys haemoglobin. Carbon monoxide is … Read more
Chapter – 12 Plants Growth And Development 1. Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate. Sol. Growth is defined as a vital process which brings about an irreversible and permanent change in the shape, size, form, weight and volume of a cell, organ or whole organism, accompanied with increase in … Read more
Chapter – 12 Respiration in Plants Q1. The ultimate electron acceptor of respiration in an aerobic organism is (a) Cytochrome (b) Oxygen (c) Hydrogen (d) Glucose Ans: (b) The ultimate electron acceptor of respiration in an aerobic organism is oxygen. Q2. Phosphorylation of glucose during glycolysis is catalyzed by (a) Phosphoglucomutase (b) Phosphoglucoisomerase (c) Hexokinase … Read more
Chapter – 11 Photosybthesis In Higher Plant’s Q.1. Addition of urea to flowering plants so as to grow faster in earthen pot results in the death of the plant after a while. What can be the cause? Ans. Due to exosmosis, the plant dies. Water gradually tends to move out of the plant cell as … Read more
Chapter – 10 Cell Cycle And Cell Division Q1. Meiosis in diploid organisms results in (a) Production of gametes (b) Reduction in the number of chromosomes (c) Introduction of variation (d) All of the above Ans: (d)‘ Meiosis in diploid organisms results in production of gametes, reduction in the number of chromosomes and introduction of … Read more