define the following
a. decomposers
b. sludge
c. exothermic reaction
d. cocoon
e. lens
f. epiblema
Answers
a)Decomposition reactions are initiated by the addition of energy.
A decomposition reaction is a chemical reaction in which some chemical bonds in a compound are broken and simpler substances are formed. The breaking of chemical bonds requires the addition of energy, usually in the form of heat.
When a compound is heated, its atoms move about more vigorously. This movement can break chemical bonds. For example, if calcium carbonate is strongly heated, it decomposes into calcium oxide and carbon dioxide.
CaCO
3
(s)→CaO(s)+CO
2
(g)
b)The residue that accumulates in sewage treatment plants is called sludge (or biosolids). ... Primary sludge is generated from chemical precipitation, sedimentation, and other primary processes, whereas secondary sludge is the activated waste biomass resulting from biological treatments.
c)An exothermic reaction is a "reaction for which the overall standard enthalpy change ΔH⚬ is negative." Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones.
d)an envelope often largely of silk which an insect larva forms about itself and in which it passes the pupa stage. b : any of various other protective coverings produced by animals.
e)A lens is a transmissive optical device that focuses or disperses a light beam by means of refraction. A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses, usually arranged along a common axis.
f)Rhizodermis is the root epidermis, the outermost primary cell layer of the root. Specialized rhisodermal cells, trichoblasts, form long tubular structures almost perpendicular to the main cell axis - root hairs that absorb water and nutrients.
a. Decomposers are organism, usually a bacterium or fungus, that breaks down the dead organic matter of the dead plants and animals
b. Sludge is the thick, soft, wet mud or a similar viscous mixture of liquid and solid components, especially the product of an industrial or refining process.
c. An exothermic reaction is a "reaction for which the overall standard enthalpy change is negative." Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones.
d. Cocoon is the covering usually made of silk which some insects (such as caterpillars) make around themselves to protect them while they grow.
e. Lens is a clear curved piece of material (as glass) used to bend the rays of light to form an image
f. (piliferous layer or rhizodermis) Epiblema is the epidermal cells of rootlets, specially adapted to absorb liquids from the soil