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
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.