Ms. Shobhna conducted a science activity in following steps :
I : She made crystals of pure copper sulphate from an impure sample.
II : She dissolved the crystals in pure water to make a blue solution.
III : She added a metallic piece into the copper sulphate solution and after some time colour of the solution changed to green.
Which of the following statements is correct regarding this activity?
AStep I involves a physical change while steps II and III involve chemical changes.
BSteps I and II involve physical changes while step III involves chemical change.
CAll the steps involve physical changes.
DAll the steps involve chemical changes.
Read the following statements.
(i) _____ tissue is involved in transportation of food in plants.
(ii) Transpiration produces a____ pull in the plant that causes the water to move upwards.
(iii) ____ is the loss of water from leaves and other aerial parts of a plant.
(iv) ____ are known as soldiers of the body.
Select the option that correctly fills up the blanks in any two of the statements.
A (i)-Phloem; (iii)-Transpiration
B (ii)-Suction; (iv)-Platelets
C (i)-Xylem; (iv)-Leucocytes
D (iii) Transpiration; (iv) Plasma
the answer is a
Arpit carried out an experiment to find out which kind of
container is best for keeping the food hot. He put the same
amount of food into 4 containers made of different materials
which were of the same size and thickness and placed them
in the same external condition. The result of his experiment
was recorded on the graph as shown.
Based on results, which container, P, Q, R or S, is the best for keeping the food hot?
A Container P
B Container R
C Container S
D Container Q
The given graph shows comparative
account of temperature range in
four habitats (P, Q, R and S).
Which of the following can be
inferred from the given graph?
(i) Animals inhabiting P may show starling colouration and arboreal adaptations.
(ii) Animals inhabiting Q have thick lips and leathery skin.
(iii) Plants present in S may have thick fleshy photosynthetic stems and leaves modified into spines.
(iv) Animals inhabiting S possess thick layer of subcutaneous fat and have very small body appendages as compared to animals inhabiting Q and R.
(v) Plants like Spruce, Acacia and Opuntia are commonly found in habitat P.
(vi) Animals found in R may show hibernation or seasonal migration.
A(i), (iii) and (vi) only
B(ii), (iv) and (v) only
C(i), (iv) and (v) only
D(ii), (iii) and (vi) only
Which of the following processes occurs during inspiration?
ARelaxation of diaphragm muscles and increase in size of chest cavity.
BContraction of diaphragm muscles and increase in size of chest cavity.
CRelaxation of diaphragm muscles and decrease in size of chest cavity.
DContraction of diaphragm muscles and decrease in size of chest cavity.
Which of the following statements is INCORRECT?
A We should allow sunlight to enter our house because it helps to kill germs.
B We should put wire mesh on the windows to stop the entry of dust and light.
C We should welcome our guests in the living room of our house.
D We should use bricks, cement, etc., to make our permanent houses as they make a house strong.
the correct answer is B