origin of the word nutritive derived from the word. Nutrient is a substance that every living organism obtains from its environment and uses it as a source of energy or for the biosynthesis of bodily components.
methods of nutrition (Methods of nutrition): On the basis of the availability of food items, living beings can be divided into two groups-
Autotrophic nutrition: This type Under nutrition, the organism makes its own food. Autotrophic nutrition is found in all green plants, blue-green algae, some bacteria and most unicellular organisms. Organisms that feed in this way are called autotrophs.
Heterotrophic nutrition: In this type of nutrition, the organism is not able to synthesize (manufacture) its own food material, but it gets them from other organisms. This type of nutrition is found in all animals, fungi and some unicellular organisms. Organisms that feed in this way are called heterotrophs.
2-Conditions Required for Photosynthesis
Required conditions for photosynthesis:
3) carbon dioxide
Some experiments have been done below to show the essentiality of these conditions or elements for photosynthesis. It is proved by these experiments that green leaves form starch as food and when starch is mixed with iodine solution, it turns blue-black in color.
3-An experiment showing the need for sunlight in photosynthesis
• Take a plant with green leaves and place it in a dark area so that the starch stored in the leaves is used by the plant and the leaves are completely devoid of starch or de-starch.
• Now the central part of a leaf should be covered with aluminum foil in such a way that some part of the leaf is covered and the rest part remains open to sunlight. The aluminum sheet should be tied so tightly that light cannot penetrate the covered part of the leaf.
• Now keep this plant in sunlight for three to four days.
Read in Hindi: What type of nutrition is there in fungi?