Descriptive Questions on Population Class 10 Concise ICSE Biology Selina Solutions Ch-15. In this article you will get the solutions / answer of Descriptive Questions / Problems with figures. Visit official website CISCE for detail information about ICSE Board Class-10 Biology.
Descriptive Questions on Population Class 10 Concise ICSE Biology Selina Solutions Ch-15
| Board | ICSE |
| Subject | Biology |
| Class | 10 |
| Book | Selina Concise |
| Chapter-15 | Population- The Increasing Numbers and Rising Problems |
| Topics | Solutions of Descriptive Questions |
Solutions / Answer of Descriptive Questions / Problems on Population
Class 10 Concise ICSE Biology Selina Solutions Ch-15 Population
Que-1: Define the following terms:
(a) Population
(b) Population density
(c) Demography
(d) Resources
(e) Growth rate of population
Ans:
(a) Population: A population is a group of individuals of the same species that live in a particular area and interbreed with one another.
(b) Population density: It is the number of individuals per square kilometre (km2) at any given time.
(c) Demography: It is the statistical study of human populations, focusing on their size, density, distribution, and other important characteristics.
(d) Resources: Resource is any substance (natural or artificial), energy or organism which is used by humans for their welfare.
(e) Growth rate of population: It is the difference between the birth rate and the death rate. When the birth rate is higher than the death rate, the population increases. When the birth rate is lower than the death rate, the population decreases.
Que-2: Distinguish between the following pairs:
(a) Exhaustible and Inexhaustible resources
(b) Conventional and Non-conventional sources of energy
(c) Natality and Mortality
(d) Tubectomy and Vasectomy
(e) Deforestation and Afforestation
Ans:
(a) Difference between exhaustible and inexhaustible resources:
| Exhaustible resources | Inexhaustible resources |
|---|---|
| Resources which cannot be renewed readily by natural means and are available in finite quantities in nature which can be easily consumed are called exhaustible resources. | Resources which are abundantly available in nature and can be used for unlimited time and cannot be exhausted by humans are called inexhaustible resources. |
| Examples: Coal, petroleum. | Examples: Wind, sun |
(b) Difference between conventional and non-conventional sources of energy:
| Conventional sources of energy | Non-conventional sources of energy |
|---|---|
| Conventional sources of energy are the natural energy resources which are present in a limited quantity and are being used for a long time. | Non-conventional sources of energy are the energy sources which cannot be exhausted easily and are continuously replenished by natural processes. |
| Examples: Coal, petroleum. | Examples: Solar energy, wind energy. |
(c) Difference between natality and mortality:
| Natality | Mortality |
|---|---|
| The total number of live births per 1000 people of population per year is called birth rate or natality. | The total number of deaths per 1000 people of population per year is called death rate or mortality. |
(d) Difference between tubectomy and vasectomy:
| Tubectomy | Vasectomy |
|---|---|
| It is the process which involves cutting or ligating of fallopian tubes by nylon thread to close the passage of egg. | It is the process in which vas deferens from each testes is ligated and a small piece between the two ligatures is removed. |
| It is contraceptive practice in females. | It is contraceptive practice in males. |
(e) Difference between deforestation and afforestation:
| Deforestation | Afforestation |
|---|---|
| It is the destruction of trees and forests for human habitation and use. | It is the planting of trees in a previously barren environment. |
| It has a detrimental effect on the environment. | It has a beneficial effect on the environment. |
Que-3: What do you mean by the 3Rs in the context of sustainable development?
Ans: The 3Rs in the context of sustainable development are Reduce, Reuse and Recycle.
- Reduction of excessive use of natural resources.
- Recycling and reuse of resources wherever possible.
- More use of renewable resources such as solar energy, wind power,etc.
Que-4: Our resources cannot keep pace with the rising population. Give three examples in support of this statement.
Ans: Three examples which show that our resources cannot keep pace with the rising population are explained below:
Food: Food is one of the most essential needs for human survival. Although new and improved methods of food production have been developed, the rate at which food is produced still cannot keep up with the rapidly growing population. Food production increases in an arithmetic manner, while population grows geometrically. This shows that if population growth continues unchecked, food shortages are likely to occur.
Water: As the population increases, the availability of clean, germ-free drinking water will become increasingly scarce. This is mainly because water sources such as rivers, ponds, and lakes are becoming more polluted.
Land: Humans are converting more land into farmland and using large areas for building houses, factories, and industries. As a result, the amount of usable land is steadily decreasing.
Que-5: How can the knowledge of the processes of reproduction help people in limiting the size of their families? Give two concrete examples.
Ans: It is necessary that the people should be educated about the need to limit the population and about the steps which can be taken in this direction —
- Married couples should be encouraged to delay the birth of their first child and to maintain a proper gap before having a second, so that each child can be brought up well. They should also be advised to stop after two children and to use family planning methods to prevent further pregnancies. These methods include options for both men and women, such as condoms, intrauterine devices (IUDs), and oral contraceptive pills.
- The traditional belief in many parts of Indian society that a family must have at least one son should be changed through education. People need to understand that this desire for a son often leads to having many children, which can negatively affect the family’s health and financial stability. Instead, the focus should be on giving proper care and upbringing to each child, whether a son or a daughter.
Que-6: What is the idea behind the phrase “population explosion”?
Ans: Population explosion refers to the rapid and massive increase in the world’s population over the past few hundred years. This rise began around the mid-nineteenth century. Today, two-thirds of the global population lives in developing countries, where more than half the people are below the poverty line.
The impact of this growing population can be seen in rising poverty, unemployment, air and water pollution, and shortages of food, healthcare, and educational resources. Several factors contribute to population explosion, including poverty, lack of awareness about family planning, certain superstitions, improved medical facilities, and immigration from neighbouring countries.
For developing nations like India, population explosion is a major challenge and acts as an obstacle to the country’s progress and overall development.
–: End of Descriptive Questions on Population Class 10 Concise ICSE Biology Selina Ch-15. :–
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