Nutrition is one of the key processes for obtaining energy from food. The components of food needed by the body are called nutrients. They allow living organisms to build their bodies, grow, repair damaged parts of their bodies and provide the energy needed to carry out vital processes. Organisms that consume food prepared by plants are called heterotrophs.
Heterosexual- others) Some plants that do not have chlorophyll, such as Cuscata, also fall into this category. It feeds on the host plant on which it climbs. It is also called a parasite, since it deprives the host plant of its valuable nutrients. Organisms such as fungi absorb nutrients from dead and decaying matter.
They secrete digestive juices onto dead and decaying matter and convert it into a solution. They then absorb the nutrients it contains. When organisms live together to share nutrients, they are said to be in a symbiotic relationship. In organisms called lichens, a pair that contains chlorophyll, which is an alga, and a fungus live together.
The fungus provides shelter, water and minerals to the algae and, in return, the algae provides food that it prepares through photosynthesis. Cells are tiny units that help form a living organism. Therefore, they are also called basic components of an organism. Food provides energy to organisms for growth and maintenance of their bodily functions.
Carbohydrates, proteins, fats, vitamins, and minerals are the components of food. These components of food are necessary for our body and are called nutrients. Auto means self and trophos means nutrition. Plants are called autotrophs because they produce their food on their own.
The preparation of food by itself is called autotrophic nutrition. Autotrophic nutrition is found in green plants and in some bacteria. Animals cannot make their food on their own. They rely on plants for food.
Therefore, nutrition in animals is called heterotrophic nutrition. Organisms that cannot prepare their own food and take food from green plants or animals are called heterotrophs and the mode of nutrition is called heterotrophic nutrition. I) Autotrophs (self-sufficient, throbos-nutrition) Autotrophic nutrition is the mode of nutrition in which organisms produce their own food from a simple substance (for example, saprotrophic plants). The mode of nutrition in which organisms obtain their nutrients from dead and decaying matter is called saprotrophic nutrition.
We hope that downloading the free Nutrition in Plants PDF from CBSE Class 7 Science Notes Chapter 1 will help you. Modes of nutrition Based on a different mode of nutrition, organisms are classified into two main types, that is, if organisms depend on others for their food, that mode of nutrition is called heterotrophic nutrition. The absorption of nutrients by the body from dead and decomposing matter in the form of a solution is called saprotrophic nutrition. Other modes of nutrition in plants There are some plants that do not contain chlorophyll and therefore cannot prepare their own food.
The mode of nutrition in which organisms produce their own food from simpler substances is called autotrophic nutrition. Insectivorous plants There are some plants that can trap insects and digest them for nutrition.