PART - 2 CH - 13 Our Environment — Science STD 10 — Question

The farmers add __________ to the acidic soil to neutralise it.(Lime (CaO), Ammonia, Sodium chloride)

Light enters our eye through the............. . (eye lens, cornea, ciliary muscles)

Lithium, sodium and ......... are the members of Dobereiner’s triad. (Nitrogen, Vanedium, potassium)

The pH value of acidic solution is lower than __________ .(7, 5, 9)

If ________ is deficient in our diet, there is a possibility that we might suffer from goitre. (March 20)(Iodine, Calcium, Iron)

......... catalyst is used in hydrogenation of vegetable oils. (Sc, Mn, Nickel)

The opening and closing of the Stomata is a function of __________  cells. 

_________ type of cell division reduces chromosome number to half in germ cells. (Meiosis, Mitosis, Binary fission)

According to Joule's law, heat energy produced in a resistor is directly proportional to the square of __________ (The voltage across the resistor, The electric current flowing through the resistor, The resistance of the resistor)

The idea of evolution of species by natural selection was given by ……….. (Robert brost, Charles Darwin, van duke)