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Select the option which on unscrambling gives the name of a dark coloured nutrient rich component of soil.

A VRAEGL
B MUUSH
C ANSD
D YLAC

Letters H to M in the given food web represent six animals.

Which of the following is correct regarding this?

A A decrease in population of H will result in an increase in populations of l and L.
B An increase in population of K will result in an increase in populations of l and J.
C A decrease in population of M will result in an increase in populations l and K.
D An increase in population of L will result in a decrease in populations of H and J.

Anita conducted an experiment to calculate the percolation rate of water in different types of soil samples. She took 200 ml water and poured it into three different types of soil samples. She noted the time that was taken by water to percolate through soil. Which of the following graphs correctly shows the relationship between amount of water percolated through different soil samples with respect to time?


A
B
C
D

Which of the following can be obtained by using the letters given in the box? (You can use each letter more than once.)


A A natural disaster that can be measured on Richter scale.
B An enormous water wave that is caused by an earthquake in the ocean floor and creates havoc in coastal areas.
C A strong tropical storm with fast spinning winds.
D Both B and C

The given figure shows three states X, Y and Z in which a matter can exist.

Identify these states and processes (P, Q, R and S) and select the incorrect option regarding them.

AProcess R is responsible for drying of wet clothes when put on clothesline.
BProcess S is responsible for formation of clouds in the atmosphere.
CA naphthalene ball converts from its X state to Y state and vice versa by involving processes P and Q.
DDuring processes P and R, heat energy is used to overcome the force of attraction between the particles.

Select the option which correctly identifies true (T) and false (F) statements.
(i) Ionosphere is a part of troposphere.
(ii) Smoke combines with oxygen to form smog, that affects visibility.
(iii) The ozone layer absorbs harmful UV rays of Sun.
(iv) Clouds, rain, fog and snow are all forms of water.
(v) Air exerts pressure in downward direction only.

Study the given Venn diagram and select the incorrect option regarding organs P, Q and R.


A P could be a sense organ that also helps in mixing of food with saliva in the mouth.
B Q could be an organ which churns the food so that it mixes with digestive juices and acid.
C P could be a sense organ that helps to take up atmospheric air and possesses hair which traps dust particles and germs.
D R could be an organ that pumps blood to all other body organs through blood vessels.

The population of animal P in a certain community was constant until a population of animal Q was subsequently introduce into that community. The interaction between the two populations is represented in the given graph. Which of the following can be inferred from the given graph?


A Q could be a carnivore who is the predator of P who could be a herbivore or a carnivore.
B P could be a herbivore who feeds on some specific plants whereas Q could be an omnivore who not only feeds on those specific plants but also feeds on P.
C Q could be an exotic animal species which competitively drove out the entire population of animal species which is the only prey of P.
D All of these

Which of the following statements about the circuit is/are incorrect?

I. Lamp L₁ will light up when either L₂ or L₃ are lighted.
II. Electricity will flow only when all the switches are closed.
III. Electricity will flow as long as any one switch is closed.

AI only
BII and III only
CI and II only
DI, II and III

Read the given statements and select the correct option regarding them.
Statement 1: Digestion and blood circulation are some voluntary actions of our body.
Statement 2: Voluntary actions are the actions which are not under human control.

ABoth statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DBoth statements 1 and 2 are false.