GUYZ WHAT ARE THE MAIN POINTS/ TOPICS OF LESSON
LIFE PROCESS CLASS 10TH
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Answer:
Explanation:
Life Process
Maintenance of living organism is essential even if they are moving, resting or even sleeping.
The processes which together perform the function of maintenance of ‘life’ are called as life processes.
Nutrition, respiration, circulation, excretion are examples of essential life processes.
In unicellular organisms, all these processes are carried out by that single cell.
In multicellular organisms, well-developed systems are present to carry out the processes.Nutrition
Nutrition
The process of acquiring food that is needed for nourishment and sustenance of the organism is called nutrition.
There are two main modes of nutrition, autotrophic and heterotrophic.
Heterotrophic nutrition has subtypes as holozoic, saprophytic and parasitic nutrition.
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Autotrophic Nutrition
If an organism can nourish itself by making its own food using sunlight or chemicals such mode of nutrition is called as autotrophic nutrition.
Plants photosynthesize (use light energy) and are called photoautotrophs.
Few bacteria use chemicals to derive energy and are called chemoautotrophs.
Photosynthesis
Photosynthesis is an important process by which food is formed.
The plants make food using sunlight and water, which provides nourishment to other organism and themselves.
Chlorophyll present in the green parts absorbs light energy.
This light energy is used to split water into hydrogen and oxygen.
Hydrogen is then used to reduce carbon dioxide into carbohydrates, typically glucose.
Chlorophyll is essential for photosynthesis and stomata to facilitate intake of carbon dioxide.
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Stomata
Stomata are pores on the leaves that help in exchange of gases.
They are mostly found on the underside of the leaf.
Each stoma is guarded by guard cells, which control the opening and closing of the pore.
The water content of the guard cells is responsible for their function.
Life-Processes-1
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Saprophytic Nutrition
Some organism feed on dead and decaying organic matter. This mode of nutrition is called saprophytic nutrition.
The food is partially digested outside the body and then it is absorbed.
E.g. Fungi are saprophytes.
Parasitic Nutrition
Some organisms feed on the expense of another organism and in turn causing it harm. This is called parasitic mode of nutrition.
These organisms live on the body or in the body of a host organism and derive the nutrients directly from the body of the host.
E.g. Leech is an ectoparasite while Ascaris is an endoparasite. Cuscuta is a parasitic plant.
Nutrition in Amoeba
Amoeba feeds by holozoic mode of nutrition.
It engulfs the food particle using pseudopodia, the process is called phagocyto
Nutrition: The process by which an organism takes food and utilizes it, is called nutrition.
Need for Nutrition: Organisms need the energy to perform various activities. The energy is supplied by the nutrients. Organisms need various raw materials for growth and repair. These raw materials are provided by nutrients.
Nutrients: Materials which provide nutrition to organisms are called nutrients. Carbohydrates, proteins and fats are the main nutrients and are called macronutrients. Minerals and vitamins are required in small amounts and hence are called micronutrients.
Modes of Nutrition
1. Autotrophic Nutrition.
2. Heterotrophic Nutrition.
Autotrophic Nutrition – Life Processes Class 10 Notes
The mode of nutrition in which an organism prepares its own food is called autotrophic nutrition. Green plants and blue-green algae follow the autotrophic mode of nutrition.
The organisms which carry out autotrophic nutrition are called autotrophs (green plants).
Life Processes Class 10 Notes Science Chapter 6 1
Autotrophic nutrition is fulfilled by the process, by which autotrophs intake CO2 and H2O, and convert these into carbohydrates in the presence of chlorophyll, sunlight is called photosynthesis.
Equation
photosynthesis Equation Life Processes Class 10 Notes
Nutrition in Plants: Green plants prepare their own food. They make food in the presence of sunlight. Sunlight provides energy’, carbon dioxide and water are the raw materials and chloroplast is the site where food is made.