Plss ans fast its really urgent........
a) define nutrition. Describe different types of heterotrophic nutrition.
b) what is photosynthesis.
c) explain the mechanism of photosynthesis.
d) difference between autotrophic nutrition and heterotrophic nutrition.
Answers
The process of taking in food and utilising it for growth of the body is called nutrition.
Heterotrophic nutrition is the mode of nutrition in which organisms depend upon other organisms to survive. All animals and non green plants are heterotrophic.
Heterotrophic organisms have to acquire and take in all the organic substances they need to survive.[1]
All heterotrophs (except blood and gut parasites) have to convert solid food into soluble compounds capable of being absorbed (digestion).Then the soluble products of digestion for the organism are being broken down for the release of energy (respiration). All heterotrophs depend on autotrophs for their nutrition. Heterotrophic plants have only four types.
The four main types of heterotrophic nutrition are:
Holozoic nutrition: the word holozoic is made from two words- holo= whole and zoikos= animals and literally means animals which eat their food whole. Complex food is taken into a specialist digestive system and broken down into small pieces to be absorbed. This consists of 5 stages, ingestion, digestion, absorption, assimilation and egestion. E.g.: human
Saprobiontic/saprophytic nutrition: Organisms feed on dead organic remains of other organisms.
Parasitic nutrition: Organisms obtain food from other living organisms (the host), with the host receiving no benefit from the parasite.When a parasite is present inside the body of the host, it is known as an endoparasite. These parasites suck and feed on the blood of the host. E.g.: tapeworms
Symbiotic nutrition:Two organisms live in close association to benefit each other or one of the two benefits the other whilst it itself suffers neither loss but nor does it gain. E.g.: fungi and algae, rizobium and leguminous plants roots.
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities.
The process ofphotosynthesis is considered as an oxidation-reduction reaction activated by light absorbed by chlorophyll or certain other substances (e.g., phycocyanin, fucoxanthol), resulting in the evolution of oxygen from water and in the formation of reduced carbon compounds (e.g., carbohydrate
One is the autotrophic nutrition and the other isheterotrophic nutrition . Inautotrophic nutrition organism prepares its food from simple substances present in thesurroundings . In heterotrophic nutrition organism obtains food from digesting organic compounds . Autotrophs are the producers in the food chain .