Tiêu đề Science.pdf ✅

PA-II/SCIENCE-X / SET-1 Page 3 of 10 6 A substance 8X9 is used in white-washing and is obtained by heating limestone in the absence of air. Identify 8X9. (a) CaOCl2 (b) CaH2 (c) CaO (d) CaCO3 1 7 What happens, when a solution of an acid is mixed with a solution of a base in a test tube? (i) Temperature of the solution decreases (ii) Temperature of the solution increases (iii) Temperature of the solution remains the same (iv) Salt formation takes place (a) (i) and (iv) (b) (i) and (iii) (c) (ii) only (d) (ii) and (iv) 1 8 What does the picture depict? i. Absorption of water from soil ii. Transport of water and mineral from the soil iii. Loss of water from leaf surface by transpiration iv. Preparation of food by photosynthesis (a) (i) and (ii) (b) (ii) and (iii) (c) (i), (ii) and (iii) (d) (ii), (iii) and (iv) 1 9 Which is the correct sequence of the components of a reflex arc? (a) Receptors→ muscles→ sensory neuron→ motor neuron →spinal cord (b) Receptors→ motor neuron→ spinal cord →sensory neuron→ muscles (c) Receptors→ spinal cord→ sensory neuron→ motor neuron→ muscles (d) Receptors →sensory neuron→ spinal cord →motor neuron→ muscles 1
PA-II/SCIENCE-X / SET-1 Page 4 of 10 10 A student, after examining temporary mount of epidermal leaf peel has drawn the following diagram and labelled I to IV parts. Choose the correct option. (a) I-Nucleus, II-Guard cell, III-Stomatal pore, IV- Epidermal cell (b) I-Guard cell, II- Stomatal pore, III-Chloroplast, IV-Epidermal cell (c) I-Nucleus, II-Stomatal pore, III-Epidermal cell, IV-Guard cell (d) I-Epidermal cell, II-Stomatal pore, III- Guard cell, IV- Chloroplast 1 11 Which of the following pair is incorrect? (a) Gibberellin - Elongation of stem (b) Auxin - Wilting of leaves (c) Cytokinin- Cell division (d) Abscisic acid- Closing of stomata 1 12 Observe the three figures given below. Which of the following depicts tropic movements appropriately? (a) B and C (b) A and C (c) B only (d ) C only 1 13 What happens to the image distance from the eye lens in a normal eye, when we increase the distance of an object? (a) Increases (b) Decreases (c) Remain unchanged (d) Depend on the size of the eye ball. 1