Refer to the given food chain operating in a small pond.
An organism ‘X’ was introduced in the community which exclusively feeds on tadpole population. Which of the following graphs correctly shows the changes in populations of water insect and small fish over time after introduction of organism X?
Can somebody pls explain the solution
Gases represented by 1 and 2 in the given picture arerespectively
AOxygen, Carbon dioxide
CNitrogen, Carbon dioxide
DCarbon dioxide, Oxygen
Which of these correctly shows the relation of revolution of the Earth around the Sun with the seasonal weather changes?
The figures P and Q represent the movement of two types of joints in our body.
Select the incorrect statement about the joints represented.
A Joint P is found between our backbone and skull
B Joint Q is found between the bones of our wrist and ankles.
C Joint P’s movement can be compared to the movement of a joystick on computer.
D All of these
Rima prepared an indicator paper by dipping a paper strip in a solution of X. She put a few drops of an unknown solution Y which contains H+ ions less than OH– ions on this paper. She observed that the colour of paper turned yellow. What do you think was solution X?
A Red litmus solution
C Methyl orange
D Turmeric solution
PL EXPLAIN WHAT IS H ions AND OH-ions IN THIS QUESTION
Aradhya dips a can into a container of soapy water as shown here. A thin film of soapy water was formed over its mouth.
Aradhya holds the can tightly in her hands for a while. What do you think will happen?
ANothing will happen.
BA bubble will form out of the mouth of the can.
CThe film will sink into the can.
DThe film will pop.