Important Points:

Chapter-Review:

• Sun is the ultimate source of energy for all living organisms.
• The synthesis of food occurs in the presence of sunlight, it is called photosynthesis.
• The leaves have a green pigment called chlorophyll.
• Chlorophyll helps leaves to capture the energy of the sunlight.
• Carbon dioxide and water are the raw materials for photosynthesis.
• Oxygen which is essential for the survival of all living organisms is produced during photosynthesis.
• Plants prepare carbohydrates during photosynthesis as food.
• Presence of starch in leaves indicates the occurrence of photosynthesis.
• The carbohydrates are made of carbon, hydrogen and oxygen.
• Soil has certain bacteria that convert gaseous nitrogen into a usable form and release it into the soil.
• Insect-eating plants are called insectivorous plants.
• Some organisms live together and share shelter and nutrients. This is called symbiotic relationship.
• Lichens are the example of symbiotic relationship.
• Carbohydrates, proteins, fats, vitamins and minerals are components of food.
• Components of food are necessary for our body and are called nutrients.