Biology notes 1 chapter life process

                   Life process

Living things-Those things which are alive are called living things.

Q1. What is the criteria to observe something is alive?

Ans- The most common criteria to identify something is alive or living is movement. All the living things are moving by themselves not by any external force.

*NOTE. Plants are also a living thing but Thier movement is observed with difficulty.

Non-living things-those things which are not alive . Non living things cannot move by themselves without any external force provided.

Example- chair,bed,fan,box.

Q2. What is life processes?

Ans- The common function performed by all the living organisms are known as life processes. Like- transport and excretion, control and coordination, growth, movement and reproduction.

Q3. What is the common energy source of living organisms?

Ans-Food is the most common energy source of living organisms.

Glucose-glucose is the simplest food and it is is also called simple sugar.

Starch- starch is made from glucose and starch is also known as carbohydrate.

                           Nutrition

Nutrition is the process of intake of nutrients [like carbohydrates, fats, protein, minerals, vitamins and water] by an organisms.

                    Modes of nutrition

1. Autotrophic.

2. Heterotrophic.

Autotrophic mode of nutrition

           -Autotrophic is a mode of nutrition in which an organisms synthesis it's own food from the simple inorganic materials.

*NOTE- The autotrophic organisms contains the green pigment called chlorophyll which is green in colour.

Q4. What are autotrophs?

Ans- The organisms which make their own food by carbon dioxide and water are called autotrophs.

 Heterotrophic mode of nutrition

        -Heterotrophic is the mode of nutrition in which the organisms cannot make their own food by simple inorganic materials, and depends on other organisms for their food.

*NOTE- All the animals have heterotrophic mode of nutrition.

Types of heterotrophic nutrition

1. Saprotrophic nutrition.

2. Parasitic nutrition.

3. Holozoic nutrition.

Saprotrophic nutrition- Saprotrophic are the nutrition in which the organisms take their food by decaying matter of dead plant , dead animals.

Parasitic nutrition- Parasitic are the nutrition in which an organisms derives its food from the body of another organisms.

Example-Roundworm

Holozoic nutrition- Holozoic is the nutrition in which the organisms take their complex organic food by the process of ingestion.

Q5. What is photosynthesis?

Ans- Photosynthesis is the process by which the plants make their own food from carbon dioxide and water in the present of ⛅ sunlight

Carbon dioxide+water+light energy  = glucose + oxygen

Condition necessary for photosynthesis

1. Sunlight

2. Chlorophyll

3. Carbon dioxide

4. Water

Q6. How the plants obtain water for photosynthesis?

Ans- the plants take water for photosynthesis by their roots which is present under the ground.

Division of animals by their eating habits

1. Herbivorous

2. Carnivorous

3. Omnivorous

1. Herbivorous- The animals which eat only plants and they depend only on plants are called herbivorous.

2. Carnivorous- The animals which eat only other animals flesh or meat are known as carnivorous.

3. Omivorous- The animals which eat both plants and animals are known as omnivorous.

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