By looking at which internal structure of a plant can you tell whether a plant is C_3 or C_4 ? Explain.

Do you recall how we can decide whether an object is moving faster than the order?

Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?

If CP and CQ are tangent from an external point C to a circle centered at O. AB is another tangent which touches the circle at R. Of CP =11 cm and BR = 4 cm , find the length of BC.

Even tough a very few cells in a C_4 plant carry out the biosynthetic calvin pathway, yet they are highly productive. Can you discuss why?

you know that a coin or pen falls to the ground when it slips off your hand. Leaves and fruis also fall to the ground when they get detached from the plant. Have you ever wondered why it is so?

Give comparison between the following : Anatomy of leaf in C_3 and C_4

Try to recall reproduction in plants which you studied in class VII. You will remember that plants that reproduce sexually have male and female reproductive parts. Can you name these parts?

Why can cytokinesis not occur in plant cells the same way as it occurs in animla cells?

If you look at the long form of the Periodic Table, you will find that the elements Li, Be, B,C,N,O,F and Ne are present in the second period. Write down their electronic configuration.