Class 9 Exam  >  Class 9 Tests  >  Biology for Class 9  >  Test: Natural Resource Water And Soil - Class 9 MCQ

Test: Natural Resource Water And Soil - Class 9 MCQ


Test Description

10 Questions MCQ Test Biology for Class 9 - Test: Natural Resource Water And Soil

Test: Natural Resource Water And Soil for Class 9 2024 is part of Biology for Class 9 preparation. The Test: Natural Resource Water And Soil questions and answers have been prepared according to the Class 9 exam syllabus.The Test: Natural Resource Water And Soil MCQs are made for Class 9 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Natural Resource Water And Soil below.
Solutions of Test: Natural Resource Water And Soil questions in English are available as part of our Biology for Class 9 for Class 9 & Test: Natural Resource Water And Soil solutions in Hindi for Biology for Class 9 course. Download more important topics, notes, lectures and mock test series for Class 9 Exam by signing up for free. Attempt Test: Natural Resource Water And Soil | 10 questions in 10 minutes | Mock test for Class 9 preparation | Free important questions MCQ to study Biology for Class 9 for Class 9 Exam | Download free PDF with solutions
1 Crore+ students have signed up on EduRev. Have you? Download the App
Test: Natural Resource Water And Soil - Question 1

Out of the total land area, how many million hectares of land suffer from degradation?

Detailed Solution for Test: Natural Resource Water And Soil - Question 1

175 million hectares of land area suffer from degradation. Land degradation is caused largely by soil erosion but also by water logging and excessive salinity. The high degree of degradation will affect the existing land resources.

Test: Natural Resource Water And Soil - Question 2

Identify the incorrect statement.

Detailed Solution for Test: Natural Resource Water And Soil - Question 2
Explanation:
The incorrect statement is:
D: Our body does not need to maintain the level of water within their bodies.
Here is a detailed explanation of why this statement is incorrect:
- Water is essential for the functioning of our body and is involved in various cellular processes. Therefore, it is crucial to maintain the level of water within our bodies.
- Our body is made up of approximately 60% water, and it plays a vital role in many physiological functions.
- Water acts as a solvent, facilitating chemical reactions and the transportation of substances within our body.
- Water helps regulate body temperature through sweating and evaporation.
- It is involved in the digestion and absorption of nutrients, as well as the elimination of waste products through urine and feces.
- Adequate hydration is necessary for maintaining proper organ function, lubricating joints, and supporting overall health.
- Dehydration can lead to various health problems, including fatigue, dizziness, kidney stones, and even life-threatening conditions in severe cases.
Therefore, it is incorrect to state that our body does not need to maintain the level of water within their bodies. Water is essential for our overall well-being and the proper functioning of our cells and organs.
Test: Natural Resource Water And Soil - Question 3

Breakdown of bigger rocks into fine smaller mineral particles is called:

Detailed Solution for Test: Natural Resource Water And Soil - Question 3
Breaking down bigger rocks into fine smaller mineral particles is a natural process known as weathering. Weathering is a key part of the rock cycle and plays a crucial role in shaping the Earth's surface. Here is a detailed explanation of weathering:
Weathering:
Weathering is the process by which rocks are broken down into smaller particles through various physical and chemical processes. It is a fundamental process that occurs over time and is influenced by factors such as temperature, moisture, and the presence of certain minerals.
Types of Weathering:
There are two main types of weathering:
1. Mechanical Weathering:
- Also known as physical weathering, it involves the physical breakdown of rocks into smaller fragments without any change in their chemical composition.
- Mechanical weathering processes include freeze-thaw cycles, abrasion by wind and water, and root wedging.
2. Chemical Weathering:
- Chemical weathering involves the alteration of rocks through chemical reactions, resulting in the breakdown of minerals and the formation of new compounds.
- Common chemical weathering processes include hydrolysis, oxidation, and carbonation.
Significance of Weathering:
Weathering plays a crucial role in the formation of soil and the release of essential nutrients for plant growth. It also contributes to the erosion and transport of sediments, which can lead to the formation of new landforms. Additionally, weathering can affect the stability of structures and impact human activities, such as agriculture and construction.
In conclusion, the breakdown of bigger rocks into fine smaller mineral particles is known as weathering. This natural process occurs through mechanical and chemical processes and is essential in shaping the Earth's surface.
Test: Natural Resource Water And Soil - Question 4

Which of the following mainly decides biodiversity in a particular area?

Detailed Solution for Test: Natural Resource Water And Soil - Question 4

Good topsoil should be nutrient and mineral rich and promote the growth of plants in your lawn or garden. Topsoil is the layer on top of the subsoil, and it sometimes differs because it has a high amount of organic matter, is nutrient rich, and has low salts.

Test: Natural Resource Water And Soil - Question 5

Which is not a function of humus?

Detailed Solution for Test: Natural Resource Water And Soil - Question 5
Function of Humus:
Humus is a crucial component of soil that is formed by the decomposition of organic matter. It plays several important roles in supporting healthy soil and plant growth. However, one function that humus does not perform is killing harmful bacteria present in the soil.
Here are the functions of humus:
1. Enhances water and air penetration:
- Humus helps to improve soil structure by binding soil particles together.
- It creates pore spaces in the soil, allowing water and air to penetrate deep underground.
- This promotes better drainage and aeration, which are essential for root growth and nutrient availability.
2. Influences soil structure:
- Humus greatly influences the soil structure of a region by improving its texture.
- It helps to stabilize soil aggregates, preventing erosion and compaction.
- This allows for better root development and nutrient uptake.
3. Increases soil porosity:
- Humus causes the soil to become more porous, creating a favorable environment for soil organisms.
- Increased soil porosity allows for better water infiltration and root penetration.
4. Nutrient retention and release:
- Humus acts as a reservoir for essential plant nutrients, such as nitrogen, phosphorus, and potassium.
- It has the ability to retain and slowly release these nutrients, providing a steady supply to plants.
5. Improves soil fertility:
- Humus enhances soil fertility by improving nutrient availability and soil structure.
- It promotes microbial activity, which aids in organic matter decomposition and nutrient cycling.
Conclusion:
In conclusion, while humus performs several important functions in soil, it does not kill harmful bacteria present in the soil. It is essential to maintain a balance of beneficial soil microorganisms for healthy soil ecosystems.
Test: Natural Resource Water And Soil - Question 6

Which of the following does not cause water pollution?

Detailed Solution for Test: Natural Resource Water And Soil - Question 6
Dissolved oxygen in water body because oxygen is pure gas it is safe and pure for living beings to intake as we know that human beings breathes in oxygen and release carbon dioxide so this implies oxygen is a pure gas and not dangerous for anything even not for water.
Test: Natural Resource Water And Soil - Question 7

Approximately 70 percent of the earth is covered by water. Of this amount, approximately _____ percent of it is suitable for human use.

Detailed Solution for Test: Natural Resource Water And Soil - Question 7
Approximately 70 percent of the earth is covered by water. Of this amount, approximately ____ percent of it is suitable for human use.
To find the percentage of water suitable for human use, we need to consider the following:
Step 1: Calculate the total percentage of water on earth.
- Given that approximately 70 percent of the earth is covered by water.
Step 2: Determine the percentage of water suitable for human use.
- This percentage will be less than the total percentage of water on earth.

- Total percentage of water on earth: 70 percent
Now, let's consider the percentage of water suitable for human use. It is important to note that not all water is suitable for human consumption due to factors such as salinity, pollution, and inaccessibility. The suitable percentage of water is significantly lower than the total percentage of water on earth.
Therefore, the correct answer is D: less than one percent.
Test: Natural Resource Water And Soil - Question 8

The rate of soil erosion is faster in:

Detailed Solution for Test: Natural Resource Water And Soil - Question 8

In general, it is hard to see vegetation over 2000 meters above mean sea level. Therefore soil erosion occurs in high mountains due to ice melting, rainfall, wind.

Test: Natural Resource Water And Soil - Question 9

Which type of soil is best for growing cotton?

Detailed Solution for Test: Natural Resource Water And Soil - Question 9

Cotton plants tend to do well in deep, well-drained, and highly fertile sandy loam soils with a pH between 5.5 & 7.5 – Cotton plants are vulnerable to the aluminum concentration often found in soils with a pH below that range.

Test: Natural Resource Water And Soil - Question 10

Forests prevent soil erosion by binding soil particles in their

Detailed Solution for Test: Natural Resource Water And Soil - Question 10
Ground water is not source of pure water because when rain water(fresh water) come in contact with ground it combined with ground mineral and became impure.
23 videos|69 docs|55 tests
Information about Test: Natural Resource Water And Soil Page
In this test you can find the Exam questions for Test: Natural Resource Water And Soil solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Natural Resource Water And Soil , EduRev gives you an ample number of Online tests for practice
23 videos|69 docs|55 tests
Download as PDF
Download the FREE EduRev App
Track your progress, build streaks, highlight & save important lessons and more!