1 Find the atomic number of an element whose electronic configuration is 2, 8, 5.
2 In case of round yellow and green wrinkled, which is a dominant trait ?
3 What does the presence of Coliform bacteria in water indicate ?
4 State the function of the following in human eye :
(b) Optic nerve
5 Explain water harvesting ? List any two water harvesting structures.
6 Mention two examples each of biotic components and abiotic components of ecosystem.
7 Write any three physical properties and three uses of ethanol.
8 Explain how covalent bonds are formed. Mention two physical properties of covalent compounds. Draw electron dot structure of CCl4.
9 Locate the position in the modern periodic table of the following elements on the basis of their properties :
(a) An element which is an inert gas with atomic number 10.
(b) An element which is tetravalent and basic element of organic chemistry.
(c) A soft metal stored under kerosene and cut with knife.
10 Out of the following elements
H(1); Be (4); Na(11); Mg (12)
(a) Write the pair elements having similar chemical properties.
(b) state the group number of each pair.
(c) name one other element belonging to each of these groups.
11 (a) What function is performed by human arms, forelimbs of dog and forelimbs of whales ?
(b) Which type of organs are these ?
(c) Why do we call them so ?
12 Mendel made two different types of cross-monohybrid and dihybrid. Why did he obtain different type of ratios in his experiments ?
13 Why does Planaria reproduce by regeneration ? Explain the process.
14 DNA content has the tendency to double itself during sexual reproduction due to combining of the genetic materials from two parents. How can the problem of DNA doubling be solved to maintain the consistency of the genetic material throughout the species ?
15 Variation is useful for the survival of species over long time. But the variants have unequal chances of survival. Explain this statements
16 Show with the help of a diagram how refraction taking place in the atmosphere makes stars twinkle. Why do stars twinkle but not the planets ?
17 (a) Define magnification by a spherical mirror and express it in terms of object distance and image distance for the mirror.
(b) The magnification produced by a convex lens is −2. What is meant by this statement and also write the information regarding image obtained from it ?
18 An estimated 50 million tons of E-waste are produced each year. The USA discards 30 million computers each year and 100 million phones are disposed off in Europe each year. The Environmental Protection Agency estimates that only 15-20% of e-waste is recycled, the rest of these electronics go directly into landfills and incinerators.
(a) Mention any two possible reasons for generation of E-waste in such a large amount.
(b) Suggest any two ways by which you can help in reducing the e-waste in the environment ?
(c) Mention the associated values.
19 Write the general formula of alkene and alkyne. Draw the electron dot structure of ethene and ethyne and write their molecular formula with structural formula.
20 (a) Why do we say that homozygous plants produce pure progeny ?
(b) Define heterozygous.
(c) Explain how the process of speciation takes place.
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