My notes book

Q.1) Which endocrine gland is present in males but not in females? Q.2) List two natural ecosystems. Q.3) What is commercial unit of electrical energy? Represent it in terms of joule. Q.4) What is the role of plane mirror and lateral inversion? Q.5) How is ethene prepared from ethanol? Give reaction involved in it. Q.6) In tobacco plant, the male gametes have twenty four chromosomes. What is the number of chromosomes in female gamete? What is the number of chromosomes in zygote? Q.7) Explain the role of mouth in digestion of food. Q.8) Mention the major events during photosynthesis. Q.9) Give two methods to slow down rancidity. Q.10) What constitutes the central and peripheral nervous system? How are the components of central nervous system protected? Q.11) Write the formula and draw electron dot structure of carbon tetrachloride. Q.12) What is saponification? Write the reaction involved in this process. Q.13) What is electrical resistivity of the material? What is its unit? Describe a...

1 MARK QUESTIONS Q.1) Name the substance oxidised and reduced in the given reaction MnO2 + 4HClv----> MnCl2 + 2H2O + Cl2 Q.2) What process in plants is known as transpiration? Q.3) Write the SI unit of resistivity? 2 MARKS QUESTIONS Q.4) Which among the following changes are exothermic and endothermic in nature? a.) Decomposition of ferrous sulphate  b.) Dilution of sulphuric acid c.) Dissolution of sodium hydroxide in water d.) Dissolution of ammonium chloride in water Q.5) Why do we store silver chloride in dark coloured bottles? Q.6) Name the correct substrates in the following enzymes a.) Trypsin b.) Amylase c.) Pepsin d.) Lipase Q.7) How does use of a fuse wire protect electrical appliances? Q.8) Three 2ohm resistors A,B and C are connected as shown below. Each of them dissipates energy and can withstand a maximum power of 18W without melting. Find the maximum current that can flow through the three resistors.  3 MARKS QUESTIONS Q.9) Differentiate between arteries and ...