1.Write the name of the first two member of homologous series
having functional group –OH.
2.Name the method by which Plasmodium reproduces. Is this method sexual or asexual ?
3.What is an ecosystem ?
4.An object is placed at a distance of 8 cm in front of a concave mirror of focal length 10 cm. Write any four characteristics of the image formed.
5.What is sustainable management ? Why is it necessary ?
6.Explain giving example of a case where active participation of the local people lead to better management of the forests.
7.Two carbon compounds A and B have the molecular formula C4H10 and C3H6 . Which of the two is most likely to show addition reaction and why ? Write a chemical equation to show an addition reaction. Where is this reaction used ?
8.Why are elements classified ? Which fundamental property of elements is used in the classification of elements in the modernperiodic table ? Name and state the law based on this property.Write the number of groups and periods in this periodic table.
9.An element (atomic number 11) burns in the presence of air to form an oxide.
(a) Identify the element and write its electronic configuration.
(b) What is the group number and period number of this
element ?
(c) Write the name and the formula of the compound formed
when this oxide dissolves in water.
10.What is pollination ? List in tabular form any two distinguishing main points between its two types.
11.State in sequence four main steps of sexual reproduction and write two advantages of such reproductions.
12.Write the functions of each of the following parts in flowering plants :
(i) Pistil
(ii) Stamen
13.How do Mendel’s experiments show that the traits are inherited independently ?
14.What are homologous and analogous organs ? How do theyprovide evidences in favour of evolution ?
15.Distinguish between a real and a virtual image. Write two characteristics of the image formed by a concave mirror when an object is placed in front of the mirror between its centre of curvature and focus.
16.A student needs a lens of power – 0.5 D. for correcting his vision.
(i) Name the defect of vision he is suffering from. Write two
causes of this defect.
(ii) What is the nature and focal length of the correcting lens ?
17.(a) What are isomers ? Write the structures of two isomers ofbutane (C4H10 ).
(b) Write the name and chemical equation for the reaction that takes place when 5% solution of alkaline KMnO4 is addeddrop by drop to warm ethanol.
(c) Name the product formed when ethanol is heated at 443Kwith excess conc. H2SO4 and state the role of conc. H2SO4in the reaction.
18.(a) Write the functions of the following parts in human female reproductive system :
(i) Ovary
(ii) Uterus
(iii) Oviduct
(b) How does the embryo get its nourishment inside themother’s body ? Describe in brief.
19.(a) What is the total number of chromosomes in a human male and a human female ? Write the type and number of sex chromosomes in each case.
(b) Distinguish between acquired traits and inherited traits.Why cannot we pass on our acquired experiences to our progeny ? Explain.
20.(a) A student has focused on the screen the image of a 2 cm high candle flame placed at a distance of 24 cm from a convex lens of focal length 16 cm. Use lens formula to
calculate the distance of the screen from the lens and length of the image formed.
(b) If the distance between the lens and the flame is increased to 32 cm, where would the image be formed and what would be its size ? Give reason to support your answer.
21.Write any four main points of the New Cartesian sign convention for reflection by spherical mirrors. If according oft his convention, the radius of curvature of a spherical mirror is
30 cm, write the name and focal length of the mirror.An object is placed at a distance of 30 cm from a concave mirror of focal length 20 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image ofthe object on it.
22.(a) Define angle of deviation. Why do different components ofwhite light split up into spectrum when it passes through aglass prism ? How can this spectrum be recombine ?
(b) What is a rainbow ? State two essential conditions for the
observation of rainbow in the sky.
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