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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

Chapter – 9 Biomolecules Q1. What are monosaccharides? Give examples. Answer Monosaccharides are the simplest carbohydrates molecules that cannot be hydrolysed into smaller carbohydrates molecules. The general formula of carbohydrates is Cn H2n OH; their examples are Ribose, Glucose and Fructose. Q 2. What is a disaccharide? Write briefly. Answer A sugar molecule composed of … Read more

Chapter – 8 Cell : The unit of Life Q1. Which of the following is not correct? (a). Robert Brown discovered the cell. (b). Schleiden and Schwann formulated the cell theory (c). Virchow explained that the cells are formed from pre-existing cells. (d). A unicellular organism carries out its activities within a single cell. Answer: … Read more

Chapter – 7 Structural Origination Of Animal 1. Discuss how classification systems have undergone several changes over a period of time? Answer. Biological classification is the scientific procedure of arranging organisms in a hierarchical series of groups and sub-groups on the basis of their similarities and dissimilarities. Scientists have proposed different systems of classification which … Read more

Chapter – 6 Anatomy of flowering plants 1. State the location and function of different types of meristems. Answer. Meristems are of three types on the basis of their location in plant body: (i) Apical meristem: It is present at the apices of root and shoot. The shoot apical meristem is present at the tip … Read more

Chapter – 5 Morphology Of Flowering Plants 1. What is meant by modification of root? What type of modification of root is found in the: (a) Banyan tree (b) Turnip (c) Mangrove trees Answer. Roots of some plants change their shape and structure and become modified to perform certain functions other than absorption and conduction … Read more