Title CBSE Class 10 Science Question Paper 2024.pdf ✅

2 www.bankofbiology.com (i) The sex of a child is determined by what it inherits from the mother. (ii) The sex of a child is determined by what it inherits from the father. (iii) The probability of having a male child is more than that of a female child. (iv) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote. The correct statements are: (a) (i) and (iii) (b) (ii) and (iv) (c) (iii) and (iv) (d) (i), (iii) and (iv) Answer: (b) (ii) and (iv) 9. Chromosomes: 1 (i) carry hereditary information from parents to the next generation. (ii) are thread-like structures located inside the nucleus of an animal cell. (iii) always exist in pairs in human reproductive cells. (iv) are involved in the process of cell division. The correct statements are: (a) (i) and (ii) (b) (iii) and (iv) (c) (i), (ii) and (iv) (d) (i) and (iv) Answer: (c) (i), (ii) and (iv) 10. In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as: 1 (a) Axon (b) Dendrites (c) Neuromuscular junction (d) Cell body Answer: (c) Neuromuscular junction 11. A stomata closes when: 1 (i) it needs carbon dioxide for photosynthesis. (ii) it does not need carbon dioxide for photosynthesis. (iii) water flows out of the guard cells. (iv) water flows into the guard cells. The correct reason(s) in this process is/are: (a) (i) only (b) (i) and (ii) (c) (ii) and (iii) (d) (ii) and (iv) Answer: (c) (ii) and (iii) 12. At what distance from a convex lens should an object be placed to get an image of the same size as that of the object on a screen? 1 (a) Beyond twice the focal length of the lens. (b) At the principal focus of the lens. (c) At twice the focal length of the lens. (d) Between the optical centre of the lens and its principal focus. Answer: (c) At twice the focal length of the lens. 13. The lens system of human eye forms an image on a light sensitive screen, which is called as: 1 (a) Cornea (b) Ciliary muscles (c) Optic nerves (d) Retina Answer: (d) Retina 14. The pattern of the magnetic field produced inside a current carrying solenoid is: 1 Answer: (c) 15. Identify the food chain in which the organisms of the second trophic level are missing: 1 (a) Grass, goat, lion (b) Zooplankton, Phytoplankton, small fish, large fish