Biology

Ascent of sap in plants takes place through:

• Cortex

• Epidermis

• Xylem

• Phloem

Which one of the following favours the fastest transpiration rate ?

• A cool, humid, windy day

• A hot, humid, windy day

• A hot, humid, still day,

• A hot, dry, windy day

What do xylem vessels carry ?

• Minerals

• Water

• Both A and B

• Food

The diffusion of water molecules through a semi-permeable membrane from a region where water is more concentrated to a region where it is less concentrated is called

(a)  

The transpiration rate is increased due to the increase in light intensity.

• True

• False

Name the process which is being demonstrated in the diagram given below.

(a)  

During transpiration, the leaves lose more water from their upper surface.

• True

• False

The leaves have more (a)   on their lower surface.

During daytime, the rate of transpiration is ____________.

• Faster

• Slower

• Remains constant

• Fluctuates

In case of minerals these move from lower concentration to molecules of higher concentration. So the minerals from the soil along with water move into the roots. Which process is being shown here ?

• Osmosis

• Diffusion

• Active transport

• Food production