What is the function of each part of a leaf?

Answer 1

Internal Leaf Parts & Function

Lower epidermis - outmost tissue on the lower side of the leaf; protects the leaf

Upper epidermis - outmost tissue on the upper side of the leaf; protects the leaf

Palisade layer - rows of elongated cells in the upper center of leaf; site of photosynthesis

Cuticle - waxy layer on the covering the epidermis; holds in moisture, prevents too much absorption of water

Stoma - opening between the guard cells; allows for gas exchange and some water

Guard cells - surround the stoma; control the opening and closing of the stoma

Vein - supply support for the leaf; contain the xylem and the phloem

Spongy layer - irregular shaped cells in lower center of leaf; absorbs gas & some water

Air space - space in the spongy layer; contain gases

Xylem - found in the vein; transports minerals and water from roots to shoots

Phloem - found in the vein; transports sugar & other products of photosynthesis from leaves to other parts of the plant

Chloroplast - cells in the leaves that contain chlorophyll; trap light energy and convert it to chemical energy

Mesophyll - all of the middle tissue of the leaf

Answer 2

Cells are the basic structural and physiological units of plants. Most plant reactions (cell division, photosynthesis, respiration, etc.) occur at the cellular level. Plant tissues (meristems, xylem, phloem, etc.) are large, organized groups of similar cells that work together to perform a specific function. A unique feature of plant cells is that they are readily totipotent. In other words, almost all plant cells retain all of the genetic information (encoded in DNA) necessary to develop into a complete plant. This characteristic is the main reason that vegetative (asexual) reproduction works. For example, the cells of a small leaf cutting from an African violet have all of the genetic information necessary to generate a root system, stems, more leaves, and ultimately flowers. Specialized groups of cells called meristems are a plant's growing points. Meristems are the site of rapid, almost continuous cell division. These cells either continue to divide or begin to differentiate into other tissues and organs. How they divide, and whether they ultimately become a tissue or an organ, are controlled by a complex array of internal plant hormones but also can be influenced by environmental conditions. In many cases, you can manipulate meristems to make a plant do something you want, such as change its growth pattern, flower, alter its branching habit, or produce vegetative growth.

Answer 3

Leaf Parts & Function

Lower epidermis - outmost tissue on the lower side of the leaf; protects the leaf

Upper epidermis - outmost tissue on the upper side of the leaf; protects the leaf

Palisade layer - rows of elongated cells in the upper center of leaf; site of photosynthesis

Cuticle - waxy layer on the covering the epidermis; holds in moisture, prevents too much absorption of water

Stoma - opening between the guard cells; allows for gas exchange and some water

Guard cells - surround the stoma; control the opening and closing of the stoma

Vein - supply support for the leaf; contain the xylem and the phloem

Spongy layer - irregular shaped cells in lower center of leaf; absorbs gas & some water

Air space - space in the spongy layer; contain gases

Xylem - found in the vein; transports minerals and water from roots to shoots

Phloem - found in the vein; transports sugar & other products of photosynthesis from leaves to other parts of the plant

Chloroplast - cells in the leaves that contain chlorophyll; trap light energy and convert it to chemical energy

Mesophyll - all of the middle tissue of the leaf

Answer 4

Leaf Parts & Function

Lower epidermis - outmost tissue on the lower side of the leaf; protects the leaf

Upper epidermis - outmost tissue on the upper side of the leaf; protects the leaf

Palisade layer - rows of elongated cells in the upper center of leaf; site of photosynthesis

Cuticle - waxy layer on the covering the epidermis; holds in moisture, prevents too much absorption of water

Stoma - opening between the guard cells; allows for gas exchange and some water

Guard cells - surround the stoma; control the opening and closing of the stoma

Vein - supply support for the leaf; contain the xylem and the phloem

Spongy layer - irregular shaped cells in lower center of leaf; absorbs gas & some water

Air space - space in the spongy layer; contain gases

Xylem - found in the vein; transports minerals and water from roots to shoots

Phloem - found in the vein; transports sugar & other products of photosynthesis from leaves to other parts of the plant

Chloroplast - cells in the leaves that contain chlorophyll; trap light energy and convert it to chemical energy

Mesophyll - all of the middle tissue of the leaf

Answer 5

A leaf has petiole, lamina, apex and margins.

The true leaf must have an axillary bud. Sometimes cladode & phylloclade also look like leaf but these are without an axillary bud hence not true leaf. Functions of laf include- photosynthesis, transpiration and several other functions in modified leaves such as climbing by tendrils made out of leaf lamina and spines for protection etc.

Answer 6

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