The reddish-brown metal X is copper (Cu). When heated in air, it forms black copper(II) oxide (CuO) or Y. On heating with hydrogen, CuO reduces back to Cu, used in electrical wiring. class 10 science Question Paper answer key cbse class 10 ...
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The correct option is (B). The correct statements are (ii), (iii), (iv). Ozone is poisonous but in the stratosphere, it forms a protective layer shielding Earth from harmful ultraviolet rays that cause skin cancer and damage living tissues. Science important questions ...
(a) Leads to infertility due to improper sperm formation. (b) Blocks sperm transport causing sterility. (c) No seminal fluid production; sperm inactive. (d) No pregnancy occurs; menstrual cycle continues. (e) Poor foetal nourishment, possibly causing miscarriage. cbse class 10 previous year ...
The purpose of urine formation is to remove nitrogenous wastes like urea and excess water, maintaining body balance. Urine is stored in the urinary bladder and released from the body through the urethra. class 10 science half yearly 2025 cbse class 10 ...
The correct option is (b) Mushroom. Mushrooms are saprophytic organisms that secrete digestive juices onto dead organic matter outside their body. The food is broken down externally, and then the simpler nutrients are absorbed, unlike organisms like amoeba or paramoecium. Science ...