Science, asked by sundert595, 1 month ago

hello guys tomorrow will be my science exam can you send me revision notes for class 7 chapter 1 chapter 2 nutrition in animals in plantspls ​

Answers

Answered by jungkook192007
1

Answer:

chapter 1 class 7 notes ,I hope this would help you

living and non living

Explanation:

Introduction to Nutrition in Plants

Living and Non-Living Organisms

Living organisms like human beings, plants and animals need food to survive and exist.

Living organisms reproduce, respond to the environment and also adapt.

Living organisms respire and excrete as well.

Cells

Cells are tiny units that help make up a living organism. Hence, they are also called building blocks of an organism.

A cell is constituted of three major parts :

A thin outer layer called the cell membrane.

A spherical structure located at the centre of the cell called a nucleus.

A jelly-like substance that surrounds a nucleus called the cytoplasm.

To know more about Cell, visit here.

Single and Multi-Cellular Organisms

Organisms that are made up of just one cell are called single-celled or Unicellular organisms. E.g. Amoeba

Organisms with more than one cell in their body are called multicellular organisms.

All human beings, plants and animals are multicellular organisms.

To know the difference between Unicellular and Muti-Cellular Organisms, visit here.

Nutrition

Nutrition is the mode of taking food by an organism and its utilisation by the body.

Nutrition is very important as the nutrients from the food consumed enables living organisms to build their bodies and grow.

Nutrition helps to repair damaged parts and organs.

Nutrition also provides energy for carrying out various functions.Autotrophs and Heterotrophs

Organisms that make food themselves are called autotrophs.

Plants are an example of autotrophs as they make their own food using carbon dioxide, water and light energy.

Organisms that rely on others and usually take in ready-made food made by the autotrophs are called heterotrophs.

Animals and human beings are an example of heterotrophs as they depend on plants in many ways for their food.

To know the difference between autotrophs and heterotrophs, visit here.

Photosynthesis

Photosynthesis is the process of synthesis of food by green plants.

This process usually takes place in the leaves of plants.

The process requires chlorophyll (green coloured pigment), sunlight, carbon dioxide and water. Organelles

Organelles are tiny cellular structures inside a cell and perform specific functions that are important for the cell.

They are found in the cytoplasm of a cell.

E.g. Chloroplast is the cell organelle that carries out photosynthesis.

Chloroplasts

The chloroplast is a type of organelle that exists in plants.

These organelles contain chlorophyll, the green coloured pigment that is responsible for carrying out the process of photosynthesis in plants.

Chlorophyll

Chlorophyll is the pigment that is responsible for the synthesis of food in green plants.

This pigment green colour to its bearers and is abundantly found in leaves.

Chlorophyll is locked inside the chloroplast.

Process of Photosynthesis

The process of photosynthesis takes place in the leaves, the “food factory” of the plants.

Carbon dioxide is taken in through tiny pores on the leaves called stomata.

Water and minerals that are required for the process are transported to the leaves from the roots through the stem.

Chlorophyll helps the leaves use the energy from the sunlight to prepare food using the carbon dioxide, water and minerals.

Oxygen is released as a by-product of this process.

The equation can be given as:Nutrients Being Replenished in Soil

Nutrients

Plants absorb mineral nutrients from the soil in order to make their own food and for other important processes.

Soils need to be enriched with nutrients such as nitrogen, phosphorus, potassium etc regularly.

Only then can we grow plants and keep them healthy.

There are 17 most important nutrients for plants.

6 are called macronutrients and rest are called micronutrients.

Macronutrients are required in large quantities while micronutrients are required in very small quantities.

To know more about Soil Fertility:Other Modes of Nutrition

Symbiotic Relationship

Organisms that live together and share their shelter and nutrients are said to be in a symbiotic relationship.

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