Nutrition in Plants Class 7 Science Notes - Chapter 1

Nutrients such as carbohydrates, minerals, proteins, vitamins, and fats are essential components of food and are necessary for the body. Living organisms require food and use the same to grow and maintain their body. Plants which synthesize their own food with the photosynthesis process are called autotrophs. When animals or any other organism consume food prepared by plants, are called heterotrophs. Plants synthesize their food with chemical substances such as minerals, carbon dioxide, and water. During the process of photosynthesis, water, sunlight, chlorophyll and carbon dioxide are required. The by-products of photosynthesis are complex chemical substances. Complex substances such as carbohydrates. Chlorophyll absorbs the solar energy and oxygen is produced by this process. This released oxygen is utilized by living organisms to survive. Some organism like fungi gets nutrition from decaying or dead matter. They are called saprotrophs.

Modes of nutrition in plants

  • Photosynthesis
  • Parasite
  • Insectivorous plants
  • Saprotrophs

Some important terminologies

  • Symbiosis – The relationship between organisms which live together, share shelter and nutrients is called symbiosis.
  • Lichens – These organisms have a chlorophyll-containing partner viz alga, fungus living together.

Few Important Questions

  1. Write the difference between saprotroph and parasite.
  2. Explain the process of photosynthesis in green plants.
  3. Fill in the blanks –
    During the process of photosynthesis plants take in ______________________ and Give out __________________ gas.
  4. Which pigment absorbs the solar energy during photosynthesis.

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Practise This Question

Edward made a list of the types of soil in a column on the basis of proportion of particles of various sizes. And in another column, he mentioned the characteristics of different types of soil. The columns are as follows:

But he was unable to decide the exact characteristic of each type of soil and match the two columns.

What according to you is the correct match for the above columns?