Life Processes-1 Nutrition, Transportation and Excretion

Answer

Nutrition is the process by which living beings obtain food, change food into simple absorbable forms, and use it to make substances needed by the body.

Answer

Food provides energy for life processes, helps in growth and repair of worn-out cells and tissues, and helps in the production of enzymes and hormones.

Answer

The two main types are autotrophic nutrition and heterotrophic nutrition. Green plants, algae and some bacteria are autotrophs, while organisms that depend on others for food are heterotrophs.

Answer

Holozoic nutrition includes ingestion, digestion and absorption of food. Parasitic and saprotrophic nutrition do not require these three processes.

Answer

Cuscuta or Dodder plant (Amar bel) is a parasite on green plants. It takes food from the host plant and depends on it for nutrition.

Answer

Saprotrophs feed on dead and decaying organic matter and help in cleaning the environment by decomposing it.

Answer

Green plants make food by photosynthesis, a biochemical process in which carbon dioxide and water are used in the presence of sunlight and chlorophyll. Oxygen is released as a by-product.

Answer

6 CO2 + 12 H2O → C6H12O6 + 6 H2O + 6 O2 ↑…