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To increase the crop yield, farmers in an area started using chemical fertilisers and pesticides tremendously which caused runoff pollution of a river flowing nearby.
Which of the following graphs correctly shows the changes in levels of dissolved oxygen and bacteria present in this river?


A
B
C
D

Observe the given figure.

From which of the following layers does molten magma come out when a volcano erupts?

AP
BQ
CR
DBoth Q and S

The given diagram represents the plot of a river stream across a town. Water samples are collected from the river from 5 different places P, Q, R, S and T. The BOD of the collected water samples is shown in the following bar diagram.
a. On which of the places (P to T) the highest amount of organic material is released into the river water?
b. Where does a water treatment plant most likely built?


A a - R, b - Between P and Q
B a - S, b - Between Q and T
C a - Q, b - Between R and S
D a - S, b - Between P and R

Select the option in which the odd member is encircled correctly on the basis of habitat.

A
B
C
D

Chaitanya suffers from stomach ache and bad digestion whenever he eats any wheat product whereas his brother Satvik complains of bad vision in dim light. Which of the following holds true regarding them?

A Chaitanya is suffering from vitamin C deficiency and should take more of citrus fruits in his diet.
B Satvik is suffering from iron deficiency and should take more of spinach, apple, etc., in his diet.
C Chaitanya is allergic to wheat products so he should stop taking them to avoid illness caused due to their consumption.
D Satvik is suffering from vitamin B₁ deficiency so he should take more of carrots and papaya.

A cylindrical bar magnet is rotated about its axis as shown in figure. If a wire is connected from the axis and is made to touch the cylindrical surface through a contact, then


AA direct current flows in the ammeter
BNo current flows through the ammeter
CA time varying current flows through the ammeter
DNone of these.

Study the given table.