Worksheet: The Origin and Evolution of the Earth | Geography Class 11 - Humanities/Arts PDF Download

Fill in the Blanks

Q1: According to the Nebular Hypothesis, planets were formed from a rotating cloud of material associated with a young sun. Who revised Kant's hypothesis to propose this theory?

Q2: Edwin Hubble provided evidence in 1920 that the universe is expanding; this evidence supports the _______ Theory.

Q3: The expansion of the universe can be visualized using a balloon analogy, but it is only partially correct because it implies that galaxies themselves are expanding, which is not supported by observations.

Q4: Stars are formed from dense gaseous clumps known as ________ in the process of star formation.

Q5: The Earth's lithosphere is made up of the Earth's ________.

Q6: The process that led to the evolution of oxygen in Earth's atmosphere was ________.

Q7: The Moon is believed to have formed as a result of a ________ impact.

Q8: The period between 4,600 million years and the present played a crucial role in the evolution of life on Earth's surface, with the evolution of life beginning around ________ million years ago.

Q9: The current composition of Earth's atmosphere is chiefly contributed by ________ and ________.

Q10: The Earth's oceans are approximately ________ million years old.

Assertion and Reason Based

Q1: Assertion: The Nebular Hypothesis suggests that planets formed from a rotating cloud of material.
Reason: Kant's hypothesis was revised by Otto Schmidt to propose the Nebular Hypothesis.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Q2: Assertion: The Big Bang Theory proposes the universe's initial existence as a tiny, singular atom.
Reason: Edwin Hubble provided evidence that galaxies move further apart as time passes.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Q3: Assertion: Star formation is a crucial process in the origin of planets like Earth.
Reason: Stars are formed from the collapse of dense clouds of gas and dust.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Q4: Assertion: The Moon played a significant role in the evolution of Earth.
Reason: The Moon is a giant star that emits light and heat.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Q5: Assertion: The Earth's lithosphere is responsible for the formation of mountains, earthquakes, and volcanic activity.
Reason: The Earth's lithosphere consists of solid, rigid plates that float on the semi-fluid asthenosphere.
(a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
(b) Both assertion and reason are true, but the reason is not the correct explanation of the assertion.
(c) Assertion is true, but the reason is false.
(d) Assertion is false, but the reason is true.

Very Short Answer Type Questions

Q1: What is the Nebular Hypothesis?

Q2: How did Edwin Hubble contribute to our understanding of the universe's origin?

Q3: What is the significance of the Moon in Earth's evolution?

Q4: Explain the process of star formation.

Q5: What is the current composition of Earth's atmosphere?

Q6: How old are Earth's oceans?

Q7: What did Otto Schmidt and Carl Weizascar revise to propose the Nebular Hypothesis?

Q8: What is the primary factor that led to the transformation of the initially barren, rocky, and hot Earth into a beautiful planet with ample water and a conducive atmosphere for life?

Q9: Explain the process that led to the evolution of oxygen in Earth's atmosphere.

Q10: What process leads to the formation of stars in galaxies?

Short Answer Type Questions

Q1: Explain the Big Bang Theory in detail, including the key events in the early universe.

Q2: Describe the process of star formation and its significance in the cosmos.

Q3: Discuss the stages in the development of planets from their formation as planetesimals to becoming full-fledged planets.

Q4: How did the Earth's lithosphere evolve, leading to its current state?

Q5: Provide an overview of the evolution of Earth's atmosphere and hydrosphere.

Q6: Explain the role of photosynthesis in the evolution of Earth's atmosphere.

Q7: Describe the process of oxygen evolution in Earth's atmosphere.

Q8: How has the study of fossils contributed to our understanding of the history of life on Earth?

Long Answer Type Questions

Q1: Discuss the Nebular Hypothesis and the contributions of Immanuel Kant, Laplace, Otto Schmidt, and Carl Weizascar in its development.

Q2: Explain the concept of the Big Bang Theory and its implications for our understanding of the universe.

Q3: Discuss the process of star formation and its role in the universe.

Q4: Explain the evolution of Earth, including its early conditions, transformation, and the role of the Moon.