NCERT Class 7 Science Textbook for Blind Students made Screen readable by Professor T K Bansal.

In this chapter we have learnt the following concepts:

• All organisms need food and utilize it to get energy for growth and maintenance of their body.
• Green plants synthesize food for themselves by the process of photosynthesis. They are autotrophs.
• Plants like Cuscuta are parasites. They take food from the host plant.
• Plants use simple chemical substances like carbon dioxide, water and minerals for the synthesis of food.
• Chlorophyll, water, carbon dioxide and sunlight are the essential requirements for photosynthesis.
• Complex chemical substances such as carbohydrates are the products of photosynthesis.
• Solar energy is absorbed by the chlorophylls present in leaves/plants.
• Oxygen is produced during photosynthesis.
• Oxygen released in photosynthesis is utilized by various living organisms for their survival.
• Many fungi derive nutrition from dead and decaying matter. They are saprotrophs.
• A few plants and all animals are dependent on others for their nutrition and are called heterotrophs.