Life processes · जैव प्रक्रम
A free Biology lesson for Class 10 children.
Nutrition, respiration, transport and excretion keep every living thing alive.
Green plants make food by photosynthesis: carbon dioxide and water, in sunlight with chlorophyll, give glucose and oxygen.
In humans, digestion starts in the mouth and is completed in the small intestine, where villi absorb the food.
Aerobic respiration uses oxygen and releases much energy. Anaerobic respiration does not use oxygen and releases less.
The human heart has four chambers. The right side pumps blood to the lungs, the left side to the whole body.
Arteries carry blood away from the heart, veins bring it back, and capillaries join the two.
In plants, xylem carries water up and phloem carries food.
The kidneys filter the blood. Each kidney has millions of filtering units called nephrons.