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LEAF in Biological Definition

Leaf

... This article is about the leaf , a plant organ. See leaf (disambiguation) for other meanings. In botany , a leaf is an above-ground plant organ specialized ...

Stoma

... , found mostly on the undersurface of a plant leaf , and used for gas exchange. Air containing ... photosynthesis in the chlorenchyma cells of the leaf interior exits through these same openings. Also, ... Stoma The easiest way to view stomata on a leaf is to take a nail varnish impression of it. ...

Chlorophyll

... Chlorophyll can be shown to be vital for photosynthesis by destarching a leaf from a variegated plant and exposing it to light for several hours. ... change revealing the presence of starch occurs only in regions of the leaf that were green and therefore contained chlorophyll. This shows that ...

Photosynthesis

... chloroplasts for every square millimetre of leaf. The surface of the leaf is uniformly coated with a water-resistant, waxy cuticle , that, protects the leaf from excessive absorption of light and evaporation of water. The ...

Photosynthesis

... chloroplasts for every square millimetre of leaf. The surface of the leaf is uniformly coated with a water-resistant, waxy cuticle , that, protects the leaf from excessive absorption of light and evaporation of water. The ...

Bacterium

... or many gram-negative bacteria. Some bacterial infections can spread throughout the host's body and become systemic . In plants , bacteria cause leaf spot , fireblight , and wilts . The mode of infection includes contact, air, food, water, and insect-borne microorganisms. The hosts infected with ...

C4 carbon fixation

... concentrations of oxygen. It is called "C 4 " because the product, oxaloacetate, contains four carbon atoms. It occurs in the mesophyll of the leaf , specifically in the mesophyll cells and the bundle sheath cells. The chemical equation is: PEP carboxylase + PEP + CO 2 → oxaloacetate ...

Drosophila

... fruit. Most eggs live inside of the fruit along the peel of the fruit. "Some feed on other decaying organic matter or on plant exudations; a few are leaf miners, parasites, or predators." (Swan, 1972) Reproduction Drosophila melanogaster egg "The female fruit fly lays batches of ...

Bacterium

... or many gram-negative bacteria. Some bacterial infections can spread throughout the host's body and become systemic . In plants , bacteria cause leaf spot , fireblight , and wilts . The mode of infection includes contact, air, food, water, and insect-borne microorganisms. The hosts infected with ...

Osmoregulation

... prolonged periods of water shortage. Succulent plants such as the cactus have water stored in large parenchyma tissues. Other plants have leaf modifications to reduce water loss, such as needle-shaped leaves, sunken stomata and thick, waxy cuticles as in the pine. The sand-dune marran grass ...

Photorespiration

... oxygen , producing glycolate . This usually occurs when oxygen levels are high; for example, when the stomata (tiny pores on the underside of the leaf ) are closed to prevent water loss. The reaction is: RuBP + rubisco + O 2 → phosphoglycolate The glycolate is then sent to ...

Virus classification

... Unassigned genera Genus Benyvirus ; type species: Beet necrotic yellow vein virus Genus Cheravirus ; type species: Cherry rasp leaf virus Genus Furovirus ; type species: Soil-borne wheat mosaic virus Genus Hordeivirus ; type species: Barley stripe mosaic virus ...
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