Leaf

Why leaves of some plants are modified to eat insects?

Which of the following statements is true?

Ajit wants to test if plants need sunlight to make food. He keeps a potted plant in sunlight. After five days, he tests for the presence of starch in the leaves.

How can Ajit improve his test?

In the given transverse section of the leaf identify the layer of cells where maximum photosynthesis occurs.

The following question contains an assertion followed by a reason. Read it carefully and answer the question on the basis of following options.

Assertion: Some plants need to be watered on regular basis, especially during the summer season.

Reason: Roots absorb the water and minerals from the soil.

Which of the following leaves have reticulate venation?

Wheat, tulsi, maize, grass, coriander (dhania), China rose

Figure out the jumbled word using the clue. 

How does the leaf of a plant help the plant to survive?

Suman spread a layer of grease (oil) on both the surfaces of all the leaves of a plant. He then put it in the sun and watered it every day. What will he observe after a week?

Observe the picture of an activity given below carried out with leaves of plant and polythene bag.

Now answer the following:

Which process is demonstrated in the activity?

The organ A of a plant combines a gas B of air with water from the soil in the presence of sunlight to form a simple food C and releases a gas D. Some of the simple food C is also changed into a complex food E which gets stored in the various parts of the plant (including A). 
Name the food C. (Glucose/Glycogen/Sucrose)

Why does cactus modify its leaves into spines.

If you cover the leaves of a plant in a polythene bag but keep them in sunlight and water regularly, what do you think, will any process be disturbed in the plant?
Will the leaves be able to carry photosynthesis? Explain.

Why is chlorophyll essential for the plant?

How can you experimentally demonstrate that transpiration occurs from leaves? How does transpiration help the plant?    

Match the following:

You have learnt in this lesson that the green pigment (chlorophyll) in the leaves of a plant is necessary for photosynthesis to take place.

Does this mean that coloured leaves cannot carry out photosynthesis? Explain. (Hint: Look closely at a coloured leaf like that of a croton plant. Do you see some parts that are green?)

Why is it not advisable to sleep under a huge tree at night?

Differentiate between reticulate venation and parallel venation.

Complete the flow chart given below.