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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
Chapter – 4 Animal Kingdom 1. What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account? Answer. For the classification of living organisms, common fundamental characteristics are considered. Animal classification would be very confusing if fundamental features are not considered. (i) Animals having different … Read more
Chapter – 3 Plant Kingdom 1. What is the basis of classification of algae? Answer. Fritsch (1935), has classified algae considering phylogeny, affinities and inter-relationships of various forms. Algae are classified into three main classes – Chlorophyceae, Phaeophyceae, and Rhodophyceae. These divisions are based on the following factors:(a) Major photosynthetic pigments present(b) Form of stored … Read more
Chapter – 2 Biological Classification 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 have undergone … Read more
Chapter – 8 Appendices Q1. A steel wire of length 4.7 m and cross-sectional area 3.0 × 10-5 m2 stretches by the same amount as a copper wire of length 3.5 m and cross-sectional area of 4.0 × 10–5 m2 under a given load. What is the ratio of Young’s modulus of steel to that … Read more
Chapter – 7 Gravitation Question 1. Answer the following: (a) You can shield a charge from electrical forces by putting it inside a hollow conductor. Can you shield a body from the gravitational influence of nearby matter by putting it inside a hollow sphere or by some other means? (b) An astronaut inside a small … Read more
Chapter – 6 System of Particles And Rotational Motion Question 1. Give the location of the centre of mass of a (i) sphere, (ii) cylinder, (iii) ring, and (iv) cube, each of uniform mass density. Does the centre of mass of a body necessarily lie inside the body? Answer: In all the four cases, as … Read more
Chapter – 5 Work, Energy And Power Question 1. The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative: (a) Work done by a man in lifting a bucket out of a well by means of a rope tied to … Read more
Chapter – 7 Definitions If S.I Unit 1. Assign oxidation number to the underlined elements in each of the following species: (a)\(\begin{array}{l}NaH_2\underline{P}O_4\end{array} \) (b)\(\begin{array}{l}NaH\underline{S}O_{4}\end{array} \) (c)\(\begin{array}{l}H_{4}\underline{P}_{2}O_{7}\end{array} \) (d)\(\begin{array}{l}K_{2}\underline{Mn}O_{4}\end{array} \) (e)\(\begin{array}{l}Ca\underline{O}_{2}\end{array} \) (f)\(\begin{array}{l}Na\underline{B}H_{4}\end{array} \) (g)\(\begin{array}{l}H_{2}\underline{S}_{2}O_{7}\end{array} \) (h)\(\begin{array}{l}KAl(\underline{S}O_{4})_{2}.12 H_{2}O\end{array} \) Answer: (a) \(\begin{array}{l}NaH_2\underline{P}O_4\end{array} \)Let x be the oxidation no. of P.Oxidation no. of Na = +1O xidation … Read more
Chapter – 6 Equilibrium Question 1. A liquid is in equilibrium with its vapours in a sealed container at a fixed temperature. The volume of the container is suddenly increased, (i) What is the initial effect of the change on the vapour pressure? (ii) How do the rates of evaporation and condensation change initially? (iii) … Read more