Category: Selina ICSE Solutions

Multiple Choice Questions: 1. Put a tick mark (✓) against the correct alternative in the following statements: (1) Cortisone hormone is secreted by:a. Medulla of adrenalb. Cortex of adrenalc. Pancreasd. ThyroidSolution: (b) Cortex of adrenal (2) Which one of the following hormones stimulates the breakdown of glycogenin the liver into glucose:a. Insulinb. Adrenalinec. Glucagond. ThyroxineSolution: (c) Glucagon […]

Multiple Choice Questions: Question 1. Put a tick mark (✓) against the correct alternative in the following statements: 1. The term “ecosystem” is derived from the Greek word “Oikos” meaning.a. Body weightb. Foodc. Housed. SizeSolution: House 2. Rat in any food chain would occupy the position ofa. Tertiary consumerb. Secondary consumerc. Primary consumerd. ProducerSolution: Primary Consumer 3. […]

Multiple Choice Questions: Question 1. Put a tick mark (✓) against the correct alternative in the following statements: (1) The testes are located within the:a. Penisb. Scrotumc. Ureterd. Urinary bladderSolution: (b) Scrotum (2) Amoeba is most commonly reproduced by:a. Buddingb. Regenerationc. Binary fissiond. Multiple fissionSolution: (c) Binary fission (3) Identify the stage which is formed after the […]

Multiple Choice Questions:Question 1. Put a tick mark (✓) against the correct alternative in the following statements (1) Pollen is produced in the:(a) Filament(b) Style(c) Pistil(d) AntherSolution: (d) Anther (2) Reproductive whorls of a flower are:(a) Stamens and carpels(b) Sepals and petals(c) Sepals and stamens(d) Petals and carpelsSolution: (a) Stamens and carpels (3) Grafting is a method of:(a) […]

Question 1. Multiple Type Question:- Question 1. Which one of the following is one of the characteristics of self-pollinated flowers?a) Flowers are large and showyb) Flowers remain closed and do not openc) Stigma and anthers mature at the same timed) Pollen is produced in very large quantities Question 2. Exine and intine are the parts of:a) Embryo sacb) […]

Exercise 22 A Question 1. The height of a tree is √3 times the length of its shadow. Find the angle of elevation of the sun. Solution: Let us assumed that, the length of the shadow of the tree be xm.Height of the tree = √3 xIf Ɵ is the angle of elevation of the sun, thentanƟ = √3x/xtanƟ = √3We know […]

Exercise 20A Question 1. The height of a circular cylinder is 20 cm and the radius of its base is 7 cm. Find:(i) the volume(ii) the total surface area. Solution:Given that, Height of the cylinder (h) = 20cmRadius of the base of the cylinder (r) = 7cm Question 2. The inner radius of a pipe is 2.1 cm. […]

Question 1. Solution: Question 2. Solution: Question 3. Solution: Question 4. Solution: Question 5. Prove: sin4 A – cos2 A = 2sin2 A – 1 Solution:sin4 A – cos4 A(sin2 A)2-(cos2 A)2(sin2 A + cos2 A) – (sin2 A – cos2 A)1-(sin2 A-cos2 A)sin2 A – cos2 Asin2 A – (1- sin2 A)2sin2 A – 1LHS = RHS […]

Question 1. In the given figure, O is the centre of the circle. ∠OAB and ∠OCB are 30° and 40° respectively. Find ∠AOC. Show your steps of working. Solution: Given:- O is the centre of the circle. ∠OAB and ∠OCB are 30° and 40° respectively.Construction:- Join ACLet us assumed that, ∠OAC = ∠OCA = x∠AOC = 180˚ […]