Class 7 Social Science Second term exam Model question paper with answers

Summary

This educational video covers several key topics related to Earth science and social welfare in India. It explores the Earth's interior, including its crust and lithosphere, and discusses how volcanic eruptions and seismic waves help scientists understand the Earth’s composition. The video also highlights the importance of the ozone layer and its protection from harmful UV rays, the Green Revolution's impact on agriculture, and government poverty alleviation schemes. Additionally, it touches on India's varied climate and topography, providing insights into environmental and societal issues, and underscores significant historical figures like Dr. M.S. Swaminathan, the father of the Green Revolution.

Takeaways

• 😀 The distance to the center of the Earth is about 6,370 kilometers, and our knowledge of the Earth's interior comes from scientific studies and indirect methods such as volcanic eruptions and earthquake wave analysis.
• 🌍 The Earth's crust consists of two parts: the outer crust and the lithosphere, the outermost rocky layer of the Earth.
• 🌞 The ozone layer protects the Earth by blocking harmful ultraviolet radiation from the Sun, which can cause damage like skin cancer and blindness.
• 📅 September 16 is observed as World Ozone Day, declared by the United Nations in 1988, to raise awareness about protecting the ozone layer.
• 🌱 Ultraviolet radiation can negatively affect plant growth, cause early aging, and increase the risk of skin cancer and blindness.
• 🏞️ The Indian subcontinent features a diverse topography, including mountain ranges, plains, deserts, plateaus, coastal plains, and islands, each influencing its climate.
• 🌬️ Factors affecting the climate of India include topography, proximity to the ocean, and wind patterns.
• 🌾 The Green Revolution significantly boosted food grain production in India through high-yielding seeds, fertilizers, pesticides, and modern technologies.
• 👍 The Green Revolution led to increased food self-sufficiency and lower food prices, but its disadvantages included overuse of water resources and reduced soil fertility due to excessive chemical inputs.
• 💼 The Indian government has implemented several poverty alleviation schemes, such as the Mahatma Gandhi National Rural Employment Guarantee Scheme and the Urban Employment Guarantee Scheme, to improve livelihoods and reduce poverty.
• 🌍 The father of the Indian Green Revolution is M. S. Swaminathan, credited with revolutionizing agriculture in India.

Q & A

What is the distance to the center of the Earth?

The distance to the center of the Earth is approximately 6,370 kilometers.

How do scientists collect information about the Earth's interior?

Information about the Earth's interior is collected through volcanic eruptions, which bring up materials from deep within, and by analyzing earthquake waves that help study the interior.

What are the two parts of the Earth's crust?

The Earth's crust has two parts: the Continental Crust and the Oceanic Crust.

What is the lithosphere, and where is it located?

The lithosphere is the outermost, rocky part of the Earth, and it includes the Earth's crust and upper mantle.

What is the primary function of the ozone layer?

The ozone layer protects the Earth by blocking harmful ultraviolet radiation from the Sun.

When is World Ozone Day observed, and why is it significant?

World Ozone Day is observed on September 16, and it was declared by the United Nations General Assembly in 1988 to raise awareness about the protection of the ozone layer.

What are the harmful effects of ultraviolet radiation on Earth?

Ultraviolet radiation can damage plant growth, cause early aging, lead to blindness, and increase the risk of skin cancer.

What are the major topographical features of the Indian subcontinent?

The Indian subcontinent has a diverse range of topographical features, including mountain ranges, plains, desert regions, plateaus, coastal plains, and islands.

What factors influence the climate of the Indian subcontinent?

The climate of the Indian subcontinent is influenced by its topography, proximity to the ocean, and wind patterns.

What is the Green Revolution, and what are its key advantages and disadvantages?

The Green Revolution was a program aimed at increasing food grain production using high-yielding seeds, fertilizers, pesticides, and new technologies. Its advantages include increased food production and self-sufficiency, while its disadvantages include excessive use of water and reduced soil fertility due to overuse of fertilizers and pesticides.

What are some key poverty alleviation schemes in India?

Key poverty alleviation schemes in India include the Mahatma Gandhi National Rural Employment Guarantee Scheme (MGNREGS), the Rural Livelihood Mission, the Public Distribution System (PDS), and the Midday Meal Scheme for schoolchildren.

Who is known as the father of the Indian Green Revolution?

Dr. M. S. Swaminathan is often referred to as the father of the Indian Green Revolution.