Explain the term 'Population Density' with reference to human beings.

Birth rate is the number of live births per thousand persons in: (a) 1 year (b) 2 years (c) 10 years (d) 20 years

The number of live births per thousand people per year is called: (a) Mortality (b) Population density (c) Population growth rate (d) Natality

Explain the term 'Population density'.

The statistical study of human population is called: (a) Mortality (b) Demography (c) Natality (d) Equality

Arrange and rewrite the terms in each group in correct order to be in a logical sequence beginning with the term that is underlined: (a) Snake, Rabbit, Cabbage, Hawk. (b) Xylem, Soil water, Cortical cells, Root hair. (c) Receptor, Response, Effector, Spinal Cord. (d) Fovea, Lens, Cornea, Conjunctiva. (e) Testis, Urethra, Sperm duct, Epididymis.

In the last century, the human population has increased tremendously. Death rate has reduced and life expectancy has increased. This rapid growth has placed significant pressure on resources. Global cooperation is needed for environmental preservation. (a) Mention any one reason for reduction in the death rate. (b) Name any one resource that is under pressure due to population explosion.

Mention two factors responsible for population explosion in India.

Name the two surgical methods of population control.

Name any two resources which come under pressure due to rising population.

“Vanishing Greenery; A Growing Urban Crisis” In most of our cities, rapid urbanisation has led to a significant decrease in greenery over the past two decades. As the population increased, the demand for housing, roads and commercial buildings grew, leading to clearing of parks, gardens and natural resources. This has contributed to several problems. (a) Mention one problem caused by the decrease in greenery. (b) How do green plants improve air quality? (c) What role can citizens play in addressing this problem?

“Birth rate in India is very high.” Mention two reasons in support of the statement.