On which surface of leaf,is the STOMATA present mostly in numbers?

Question

please tell in detail about the question.i hv to prepar it for board exams.

Answer 1

In botany, a stoma (also stomate; plural stomata) is a tiny opening or pore, found mostly on the under-surface (epidermis) of a plant leaf, and used for gas exchange. The pore is formed by a pair of specialized parenchyma cells known as guard cells which are responsible for regulating the size of the opening. Air containing carbon dioxide enters the plant through these openings where it gets used in photosynthesis and respiration. Oxygen produced by photosynthesis in the chlorenchyma cells (parenchyma cells with chloroplasts) of the leaf interior exits through these same openings. Also, water vapor is released into the atmosphere through these pores in a process called transpiration.

Dicotyledons usually have more stomata on the lower epidermis than the upper epidermis. As these leaves are held horizontally, upper epidermis is directly illuminated. Locating fewer stomata on the upper epidermis can then prevent excess water loss.

Monocotyledons are different. Because their leaves are held vertically, they will have the same number of stomata on the two epidermes.

If the plant has floating leaves, there will be no stomata on the lower epidermis and they absorb gases directly from water through the cuticle. If it is a submerged leaf, no stomata will be present on either .

SO STOMATA ARE MORE IN NUMBERS ON THE LOWER OR THE VENTRAL SURFACE OF DICOT LEAF. IN MONOCOT THEY ARE EQUAL IN NUMBER

1) structure of stoma-
http://iweb.tntech.edu/mcaprio/leaf_stomata_L.jpg

2) http://www.puc.edu/Faculty/Gilbert_Muth/art0077.jpg

Answer 2

Dorsal surface of course. Lower epidermis. There are also stomates on the upper epidermis, but my experience when I viewed them on the microscope there are only few.
What I mean is the typical dorsiventral plant. The ventral surface is the one exposed to the environment, where it can absorb carbon dioxide. Carbon dioxide passes through the stomates and will be met by RuBP as what we learned in Photosynthesis. I assume you know that. The dorsal surface is the one that is responsible for preventing water loss. It has more stomates so that the stomates will absorb the moisture from the air; which is selectively advantageous because the venral surface is exposed to sunlight.

Other leaves are not dorsiventral, because they are vertically arranged such as the century plant. Vertical leaves have both the surfaces exposed to the environment so upper and lower epidermis has stomates in equal numbers.

Hope I helped. :-)

Answer 3

There isn't really much detail to give in answer to a question like this. Stomata are predominantly found on the underside of leaves (abaxial surface). Occasionally they are found on both surfaces but only rarely do those on the upper surface come close to the same frequency as the lower. Stomate distribution does relate to leaf anatomy: the structure of leaves (palisade mesophyll then spongy mesophyll) realtes to function, with the more open spongy mesophyll having a role in gas exchange ... it is into this layer that the stomata open.

Answer 4

stomata is a small opening on the surface of the leaf, it is seen on the dorsal side but on the ventral (bottom) side it is in large numbers. stoma means opening ,so the epidermal layer of the leaf is broken by the stoma, the layers below the epidemis has the mesophyll layer and the sponge tissue, here also u can see many stomata. each stoma has two bean shaped cells which expands and shrinks thus bringing about the opening and closing of the stomata, this also regulates evoparation and prevention of excessive loss of water, u must go into the detail of closing and opening of the stomata mechanism by books/ website,coz it is important to explain this part very clearly and in detail from the exam point of view.

Answer 5

What is the Stomata?
Stomata are microscopic pores found on the under side of leaves. You will find the stomata in the epidermal tissue. The stomata is bounded by two half moon shaped guard cells that function to vary the width of the pore. Each guard cell contains chloroplasts. The glucose concentration of the the cells changes with the photosynthetic activity and therefore it is the guard cells that regulate the opening and closing of the stoma.

Answer 6

In botany, a stoma (also stomate; plural stomata) is a tiny opening or pore, found mostly on the under-surface (epidermis) of a plant leaf, and used for gas exchange.

google stomata

Answer 7

Stomata is present mostly in numbers at the dorsal (lower) side of the leaf.

Answer 8

On lower surface

Answer 9

Stomata are found in the lower epidermis abundantly which is the lower surface.

Answer 10

The underside of the leaf. Why, I don't know.