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Which one of the following pairs is correctly matched?

Which of the following is not a structural adaptation?

ACamels have long eyelashes to protect their eyes from dust storm.
BSome animals migrate from less favourable to more favourable places in search of food and to escape harsh weather.
CStem of cactus becomes fleshy to store water and also performs photosynthesis.
DSome aquatic plants have reduced root system and dissected ribbon like leaves.

The Earth completes one revolution in ____.

AOne hour
BOne year
COne day
DOne month

On a cold winter day, Sohan put a room heater near his aquarium, which made water in the aquarium warm but not hot. What could happen due to this?

AFishes would feel more comfortable in warm water due to more availability of oxygen.
BFishes would suffocate due to less availability of oxygen for breathing.
CFishes would die due to decrease in amount of carbon dioxide dissolved in warm water.
DFishes would feel more comfortable in warm water due to decrease in amount of dissolved carbon dioxide.

A few methods of separation are represented with the help of examples as :
W : Alum is added to muddy water to settle the mud particles at the bottom.
X : Salt is separated from saline water without any loss of water.
Y : Sand is separated from gravel at a construction site.
Z : Chilli powder is separated from its mixture with water.
W, X, Y and Z are respectively

ALoading, evaporation, sedimentation and sieving
BFiltration, decantation, sieving and winnowing
CEvaporation, winnowing, sedimentation and sieving
DLoading, distillation, sieving and filtration.

Rachna took two strong magnets to stroke a steel bar in the directions shown in the figure.

Which one of the following show correctly the poles of the steel bar after the stroking method was applied?

If 'a' denotes '+', 'b' denotes '÷', 'c' denotes '–' and 'd' denotes '×', then find the value of 28b7d8c6a4.


A
B32
C30
D34

Sonali mixed a packet of salt in a small amount of sand and then tried to recover the salt by the usual processes of sedimentation, decantation or filtration followed by evaporation. To her surprise, she could recover only a small part of the salt that she had taken. The possible reasons could be
I. Salt also got evaporated along with water.
II. The quantity of salt was much more than that required to form a saturated solution.
III. The undissolved salt remained mixed with sand.
IV. The quantity of water taken was insufficient to dissolve all the salt.

AII and III only
BI and IV only
CII, III and IV only
DAll of these.

the relationship amongst, "Petals, Bouquet, Flowers" ?

A
B
C
DNone of these

Find the missing number, if a certain rule is followed row-wise or column-wise.



A4
B8
C12
D16