Download KENDRIYA VIDYALAYA NO.3,NAL BIKANER HOLIDAY HOME

KENDRIYA VIDYALAYA NO.3,NAL BIKANER
HOLIDAY HOME WORK
CLASS-9
WRITE AND LEARN THE ANSWER OF FOLLOWING QUESTIONS:Q-1 How can we keep mosquito and prawn in the same group?
Q-2 Which organism is more complex and evolved among bacteria, mushroom and mango tree.
Give reasons.
Q-3 You are given leech, Nereis, Scolopendra, prawn and scorpion; and all have segmented body
organisation. Will you classify them in one group? If no, give the important characters based
on which you will separate these organisms into different groups
Q-4 What is the difference between the following :
(a) The heart of a fish and that of a bird
(b) Breathing organs of fish and lizard
(c) The position of mouth in shark and salmon.
Q-5 Classify the following organisms based on the absence/presence of true coelom (i.e.,
acoelomate,
pseudocoelomate and coelomate)
Spongilla Sea anemone, Planaria Liver fluke
Wuchereria Ascaris, Nereis, Earthworm
Scorpion Birds, Fish, Horse.
Q-6 Differentiate between the following , giving one main point of difference.
(a) Gymnosperm and Angiosperm
(b) Diploblastic and Triploblastic animals
(c) Dicotyledons and Monocotyledons
Q-7 Illustrate the law of conservation of energy by discussing the energy changes which occur
when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob
eventually come to rest? What happens to its energy eventually? Is it a violation of law of
conservation of energy
Q-8 What is the work done by the force of gravity on a satellite moving round the earth? Justify
your answer
Q-9 How many times does the kinetic energy of a body become when its speed is doubled
Q-10 The velocity of a body moving in a straight line is increased by applying a constant force F,
for some distance in the direction of the motion. Prove that the increase in the kinetic energy
of the body is equal to the work done by the force on the body
Q-11 a) Is it possible that a force is acting on a body but still work done is zero? Explain giving
one example.
(b) Two bodies of equal masses move with uniform velocities of v and 3v respectively. Find
the ratio of their kinetic energies.
Q-12 The kinetic energy of an object of mass m moving with a velocity of 5 m/s is 25 J. Calculate
its kinetic energy when its velocity is doubled? What will be its kinetic energy when its
velocity is increased three times?
Q-13 An object of mass 10 kg is made to fall freely from a height of 10 m. Complete the table :
Height of object (m)
PE (J)
KE (J)
Mechanical Energy (J)
10
8
5
Just above ground
Q-14 In an experiment, 1.288 g of copper oxide was obtained from 1.03 g of copper. In another
experiment 3.672 g of copper oxide obtain from the 2.938 g of copper. Show that these figures
verify the law of constant proportion
Q-15 The mass of a single atom of an element X is 2.65 x 10 -23g. What is its atomic mass? What
could this element.
Q-16 A doctor/nurse/health-worker is exposed to more sick people than others in the
community. Find out how she/he avoids getting sick herself/himself
Q-17 Prevention of disease is more desirable than its treatment”. Justify the statement by
discussing three major strategies to be adopted for the prevention of infectious diseases.
Q-18 (a) Doctors diagnosed that Radha was suffering from HIV-AIDS. List any two methods by
which she might have contacted the disease.
( a ) Name the organ affected by this disease.
(b) Why antibiotics cannot be used for its treatment? Justify your answer.
Q-19 How principle of immunization is implemented for eliminating polio?
Q-20 ) Why a person suffering from AIDS cannot fight even very small infections?
(b) In a slum area many people are suffering from malaria mention any two
unhygienic conditions that must be prevailing in that locality?