Dictionary,Defintion,Meaning,What is Photophosphorylation, Phytochrome, Photon, Photonasty, Photophase, Photyphile, Photophosphorylation

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Home >>Biology Dictionary >> Photophosphorylation - Phytochrome

Your Ad Here	Photon. A quantum of radiant energy with a wavelength in the visible range of the electromagnetic spectrum. Photonasty. Response to a general non-directional illumination stimulus, e.g. closing or opening of flowers at nighttime, seen respectively in wood sorrel and evening primrose. Photophase. The light phase of a dark light cycle. Photyphile. Literally ‘light-loving’; light receptive phase of circadian rhythm, lasting about 12 hours. Photophosphorylation (Photosynthetichosphorylation). Coupling of phosphate with ADP to make ATP, using light energy absorbed in photosynthesis. May be cyclic or non-cyclic; former results in formation of ATP only, latter in formation of ATP and hydrogen (used in CO₂, reduction). See Photosynthesis.
Photopigment. A pigment molecule that can be excited by light such as chlorophyll. Photoreceptor. Receptor detecting light, e.g. vertebrate eye. Photosynthesis. A chemical process by which green plants synthesize organic compounds from carbon dioxide and water in the presence of sunlight. It occurs in the chloroplasts (mot of which are in the leaves) and there are two principal series of reactions. In the light reactions, which require the presence of light, energy from sun-light is absorbed by photosynthetic pigments (chiefly the green pigment chlorophyll) and converted into chemical energy.
In the ensuring dark reactions, which can take place either in light or darkness, this chemical energy is used in the production of simple organic compounds from carbon production of simple organic compounds from carbon dioxide and water. Further chemical reactions convert these compounds into chemicals useful to the plant. Photosynthesis can be summarized by the equation: CO₂ + 2H₂O --> [CH₂O]+O₂ Virtually all other forms of life are directly or indirectly dependent on plants for food; photosynthesis is the basis for all life on earth. Furthermore, virtually all the atmospheric oxygen has originated from oxygen released during photosynthesis. Phragmocome. The internal shell of a cuttlefish or other cephalopod made up of several chambers.	Your Ad Here
Phycobilins (Biliproteins). Red (Phycoerythrin) and blue (Phycocyanin) pigments present with chlorophyll in red and blue green algae. Like carotene assist in photosynthesis by transferring light energy that they absorb to chlorophyll. Proteins (globulins) combined with prosthetic pigment groups; structurally similar to bile pigments groups; structurally similar to bile pigments in animals. Phyletic . Of or relating to a line of descent.
Your Ad Here	Phylloplane. The surface of the leaf in plants. Phyllotaxy. The arrangement of leaves on a stem. Phylogram. A tree-like diagram showing the degree of relationship of different taxa. Phylum. One of the major kinds of group used in classifying animals, e.g. phylum chordate. Consists of one class or a number of similar classes. Phylum is not often used in plant classification, the term Division being substituted. Physiological speciliazation. Physiologically distinct but morphologically identical races within a species. In the rust fungus, Puccinia graminis about 250 physiological races have developed as a result of sexual reproduction. Physiology. Study of the processes occurring in living organism. Phytoalexins. Non-specific fungi toxic substances, generally phenolic in nature synthesized de novo or in greatly increased concentration by plants is response to infection by fungi.

Phytochrome. A protein-based plant pigment present in small quantities in many plant organs. It exists in two inter convertible forms: a physically active form, which forms when the light is illuminated with red light or normal exposed to far-red light or darkness. The active form regulates many plant processes, such as seed germination and the initiation of flowering.

Phytophagous. Feeding on plants

Phtoplankton. The plant component of plankton, consisting chiefly of microscopic algae, such as diatoms and dinoflagellates.
Near the surface of the sea there may be many millions of such plants per cubic metre. Members of the phytoplankton are of great importance as they form the basis of food for all other forms of aquatic life, being the primary producers.

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Biology Dictionary - Part 3 Part 4 Primates - Proembryo Prostaglandins - Proteolytic Enzyme Protostele - Pterodactyla (Pterosauria) Purkinje Cells - Pyrenoid Quadrate - Quantasomes Radula - Receptor (Sense-Organ) Rennin - Respiratory Movement Respiratory Pigment - Rhodophyta