Question

Question 49:
(a) How does carbon dioxide from the air enter the leaves of a plant to be used in photosynthesis ?
(b) How does water from the soil reach the leaves of a plant to be used in photosynthesis ?

Lakhmir Singh Biology Class 10

Answer 1

BIOLOGY
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A) ➡ CARBON DIOXIDE IN THE AIR ENTERS THE LEAF THROUGH STOMATA TO BE USED FOR PHOTOSYNTHESIS
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B) ➡ WATER FROM THE SOIL REACH THE LEAF THROUGH XYLEM TO BE USED FOR PHOTOSYNTHESIS
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➡ HOPE IT HELPS

➡ HAVE A NICE DAY MY FRIEND

Answer 2

Hi.

Here is your answer.

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a) The Carbondioxide from the atmosphere enters the leaves through the Stomata, which are the small structures present in the leaves of the Plants. Stomata are usually closed during night while they are open during the day. Stomata also helps in the transpiration.

b) The water from the Soil reaches the roots through Osmosis and Diffusion. After reaching the Roots it is transported ti the Xylem through the cortical cells die ti cell to cell osmosis. A pressure known as Root Pressure is created which helps in the movement of water from the root to xylem tissues.

After the water reaches the xylem, it is transported to the leaves( where the photosynghesis occurs) through the viens of the plants.

There are many theories which proves that water is transported to xylem. Some of then are---

Transpirational Pull Theory.
Root Pressure Theory.
Capillarity

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Hope it helps.

Have a nice day.