Quiz-summary
0 of 5 questions completed
Questions:
- 1
- 2
- 3
- 4
- 5
Information
We will post 5 questions daily on static topics mentioned in the UPSC civil services preliminary examination syllabus. Each week will focus on a specific topic from the syllabus, such as History of India and Indian National Movement, Indian and World Geography, and more.
You have already completed the quiz before. Hence you can not start it again.
Quiz is loading...
You must sign in or sign up to start the quiz.
You have to finish following quiz, to start this quiz:
Results
0 of 5 questions answered correctly
Your time:
Time has elapsed
You have reached 0 of 0 points, (0)
Categories
- Not categorized 0%
- 1
- 2
- 3
- 4
- 5
- Answered
- Review
-
Question 1 of 5
1. Question
Lichen is a pioneer species. What do you understand by this statement?
Correct
Solution: c)
Lichens are typically the first organisms to colonize bare rock. They are therefore the pioneer species in primary succession.
Many organisms require soil before they can colonize an area. Lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. Also, as lichens die, they provide some organic matter that also contributes to soil. Mosses can then colonize the thin soil; as mosses die, the soil thickens more allowing other hardy species to colonize. The process continues until a mature forest forms, sometimes centuries later.
Incorrect
Solution: c)
Lichens are typically the first organisms to colonize bare rock. They are therefore the pioneer species in primary succession.
Many organisms require soil before they can colonize an area. Lichens that colonize bare rock secrete acids that break down the rock and start the soil-production process. Also, as lichens die, they provide some organic matter that also contributes to soil. Mosses can then colonize the thin soil; as mosses die, the soil thickens more allowing other hardy species to colonize. The process continues until a mature forest forms, sometimes centuries later.
-
Question 2 of 5
2. Question
Consider the following statements.
- Ecosystem is formed by the interaction of both biotic and abiotic factors.
- Ecosystem is larger than biome and contain many biomes.
Which of the above statements is/are incorrect?
Correct
Solution: b)
An ecosystem is a system formed by the interaction of all living organisms (biotic) with each other and with the physical and chemical factors (abiotic) of the environment in which they live, all linked by the transfer of energy and material.
Biome is a larger region than an ecosystem and comprises many such ecosystems.
Incorrect
Solution: b)
An ecosystem is a system formed by the interaction of all living organisms (biotic) with each other and with the physical and chemical factors (abiotic) of the environment in which they live, all linked by the transfer of energy and material.
Biome is a larger region than an ecosystem and comprises many such ecosystems.
-
Question 3 of 5
3. Question
Which one of the following is the best description of the term ‘standing crop’?
Correct
Solution: a)
Standing crop is defined as the total amount or number of living things or of one kind of living thing (such as an uncut farm crop, the fish in a pond, or organisms in an ecosystem) in a particular area at any given time.
Incorrect
Solution: a)
Standing crop is defined as the total amount or number of living things or of one kind of living thing (such as an uncut farm crop, the fish in a pond, or organisms in an ecosystem) in a particular area at any given time.
-
Question 4 of 5
4. Question
Ecological Succession is generally characterized by
- Increased productivity
- Decreased niche development
- Increased complexity of food webs
How many of the above statements is/are incorrect?
Correct
Solution: a)
Statement 2 is incorrect.
Ecological succession, the process by which the structure of a biological community evolves over time. The time scale can be decades (for example, after a wildfire), or even millions of years after a mass extinction.
The community begins with relatively few pioneering plants and animals and develops through increasing complexity until it becomes stable or self-perpetuating as a climax community.
Two different types of succession—primary and secondary—have been distinguished. Primary succession occurs in essentially lifeless areas—regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. Secondary succession occurs in areas where a community that previously existed has been removed; it is typified by smaller-scale disturbances that do not eliminate all life and nutrients from the environment.
Increased niche development is the characteristic feature of Ecological succession.
Incorrect
Solution: a)
Statement 2 is incorrect.
Ecological succession, the process by which the structure of a biological community evolves over time. The time scale can be decades (for example, after a wildfire), or even millions of years after a mass extinction.
The community begins with relatively few pioneering plants and animals and develops through increasing complexity until it becomes stable or self-perpetuating as a climax community.
Two different types of succession—primary and secondary—have been distinguished. Primary succession occurs in essentially lifeless areas—regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. Secondary succession occurs in areas where a community that previously existed has been removed; it is typified by smaller-scale disturbances that do not eliminate all life and nutrients from the environment.
Increased niche development is the characteristic feature of Ecological succession.
-
Question 5 of 5
5. Question
Which one of the following is the correct sequence of ecosystems in the order of decreasing productivity?
Correct
Solution: c)
Production/unit area depends on the number and diversity of producers.
Mangroves are one of the high productive regions in the world whereas ocean has least productivity.
Incorrect
Solution: c)
Production/unit area depends on the number and diversity of producers.
Mangroves are one of the high productive regions in the world whereas ocean has least productivity.
Join our Official Telegram Channel HERE for Motivation and Fast Updates
Subscribe to our YouTube Channel HERE to watch Motivational and New
Join our Twitter Channel HERE
Follow our Instagram Channel HERE
Follow us on LinkedIn : HERE
