Question

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Answer 1

The above diagram is a transverse section of leaf tissues.

• A is cuticle

• B is upper epidermis

• C is palisade parenchyma

• D is bundle sheath cells

• E is xylem

• F is phloem

• G is spongy parenchyma

• H is stomata

• I is lower epidermis

FUNCTION OF C : PALISADE PARENCHYMA

• It is present beneath the upper epidermis.

• These are vertically elongated cells , arranged in such way to provide maximum sunlight to chloroplast.

• They contain more number of chloroplast as compared to spongy parenchyma

• They primary function is photosynthesis.

FUNCTION OF D: BUNDLE SHEATH CELLS

• These are present surrounding the xylem and phloem.

• They also have chloroplast and Rubisco enzyme.

• These helps in photosynthesis.

FUNCTION OF E :XYLEM:

• It consists of four elements mainly tracheids, vessels, xylem parenchyma and xylem fibres.

• Xylem helps in water and mineral transport in plants.

• The transport is bidirectional.

FUNCTION OF F: PHLOEM

• It consists of four elements namely sieve elements, companion cells , phloem parenchyma and phloem fibres.

• Phloem helps in food transport across all the parts of plant.

• The food transport is multidirectional.

FUNCTION OF H : STOMATA

• Stomata has a small hole in the middle called stoma.

• It is surrounded by kidney or bean shaped guard cells .

• Guard cells are surrounded by modified epidermal cells called subsidiary cells.

• Stomata helps in gaseous exchange.

• It also helps in transpiration ,leading to loss of water in the form of vapour from leaves.