Previous year MCQs

Environment & Ecology UPPSC 2024 GS-I
Question

Which of the following is the correct sequence of phases of Biotic succession?

Answer & Solution

Answer: (Detailed Solution Below)

Option D: Migration - Ecesis - Reaction- Stabilisat

Detailed Solution:

The correct answer is “Migration - Ecesis - Reaction- Stabilisat”.
Biotic succession refers to the process of change in the species composition of an ecosystem over time. The correct sequence of the phases of biotic succession is: Migration → Ecesis → Reaction → Stabilization

Phase Description
Migration The arrival of propagules (seeds, spores, or organisms) into a new area.
Ecesis The establishment and successful germination or growth of these organisms.
Reaction The modification of the environment by these organisms, making it more or less favorable for other species.
Stabilization (Climax) The final stage where a stable and self-sustaining community is established.

Similar Questions:

Consider the following statements regarding Voice of Global South Summit (VOGSS):

1. India recently concluded its 2nd Voice of Global South Summit.
2. The term Global South is related to developed countries.

Which of the above statements is/are correct?
  1. A) Only 2
  2. B) Neither 1 nor 2
  3. C) Only 1
  4. D) Both 1 and 2
Which of the following statements about Radioactive pollution are correct?

1. It causes hereditary change in the animals.
2. It causes dis-balance among different minerals in the soil.
3. It hinders blood circulation.
4. It causes carcinogenesis.

Select the correct answer from the codes given below:
Codes:
  1. A) 1 and 2
  2. B) 1 and 4
  3. C) 1, 3 and 4
  4. D) 2, 3 and 4
Which one of the following biosphere reserves is not included in the list of world network of biosphere reserves of UNESCO?
  1. A) Manas
  2. B) Sunderban
  3. C) Gulf of Mannar
  4. D) Nilgiri
Given below are two statements, one is labelled as Assertion (A) and other as Reason (R) -

Assertion (A) - Population control is necessary to maintain the environment of the country.
Reason (R) - Due to the rapid increase in population, the environmental balance is maintained.

Select the correct answer using the code given below—
Code -
  1. A) Both (A) and (R) are true and (R) is correct explanation of (A)
  2. B) Both (A) and (R) are true but (R) is not correct explanation of (A)
  3. C) (A) is true but (R) is false
  4. D) (A)is false but (R )is true
Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R).

Assertion (A) : Turkish invasion on India was successful.
Reason (R) : There was no political unity in North India.

Select the correct answer from the codes given below:
  1. A) Both (A) and (R) are true and (R) is the correct explanation of (A).
  2. B) (A) is false, but (R) is true.
  3. C) Both (A) and (R) are true, but (R) is not the correct explanation of (A).
  4. D) (A) is true, but (R) is false.
Given below are two statements, one is labelled as Assertion (A) and the other as Reason (R).

Assertion (A): Development is being defined as improving living standards and welfare.
Reason (R): Growth in per capita income is not a sufficient measure of development.

Select the correct answer from the codes given below:
  1. A) Both (A) and (R) are true and (R) is the correct explanation of (A)
  2. B) (A) is false, but (R) is true
  3. C) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
  4. D) (A) is true, but (R) is false
The concept of ecological niche was enunciated by
  1. A) Greenels
  2. B) Darwin
  3. C) E.P.Odum
  4. D) C.C.Park
Which of the following are envisaged by the Right against Exploitation in the Constitution of India?

1. Abolition of untouchability
2. Prohibition of human trafficking and forced labour
3. Prohibition of employment of children in factories and mines
4. Protection of interests of minorities

Select the correct answer from the codes given below:
  1. A) 2 and 3
  2. B) 3 and 4
  3. C) 1 and 2
  4. D) 1 and 4
Which of the following is the correct order of plant species from higher to lower order?
  1. A) Class — Phylum — Order — Plant Kingdom
  2. B) Order — Class — Phylum — Plant Kingdom
  3. C) Class — Plant Kingdom — Phylum — Order
  4. D) Plant Kingdom—Phylum — Class — Order
On which date Ozone Day, is observed ?
  1. A) October 2
  2. B) September 16
  3. C) April 29
  4. D) January 30
With reference to "FWD 200B", which of the following statements is/are correct?

1. This is India's first indigenous bomber "UAV" aircraft.
2. Its payload capacity is 100 kgs.

Select the correct answer from the codes given below:
  1. A) Only 2
  2. B) Neither 1 nor 2
  3. C) Only 1
  4. D) Both 1 and 2
Which one of the following pairs is not correctly matched regarding peculiarities of Ramganga project?
  1. A) Dam's length – 825.8 metres
  2. B) Hydropower generation capacity – 198 MW
  3. C) Location – Garhwal (Uttarakhand)
  4. D) Irrigated area – 6 lac hectares