*Dear Students,*

Welcome to **Ecology MCQ-11 (CSIR NET Ecology Questions)**. This MCQ set consists of **Advanced** Ecology / Conservation Biology / Environmental Sciences Questions taken from the previous year question papers of **CSIR NET Life Sciences** Examination. These questions can be used for the preparation of **CSIR NET, ICMR JRF, DBT BET JRF, and GATE. **

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**Ecology CSIR NET Questions Part 1 | Part 3**

**(1).** With reference to the graph given below, identify the optimal territory size. (CSIR_2016_I)

(a). A

(b). B

(c). C

(d). D

**Ans. (a)**

**(2). ** Given below are growth equations where dN/dt is defined as:

(A). rN/K

(B). rN

(C). rN[(K-N)/N]

(D). rN[(K-N)/K]

With reference to the above equations, which one of the following statements is correct? (CSIR_2017_II)

(a). B represents exponential growth and A represents logistic growth

(b). B represents exponential growth and D represents logistic growth

(c). B represents zero growth and C represents logistic growth

(d). A represents exponential growth and D represents logistic growth

**Ans. (b)**

**(3).** Given below is an ecological pyramid

The above pyramid represents: (CSIR_2017_II)

(a). Pyramid of number of a parasitic food chain and pyramid of biomass of a pond ecosystem

(b). Pyramid of number of a pond ecosystem and pyramid of biomass of a forest ecosystem

(c). Pyramid of energy of a grassland and pyramid of biomass of an open ocean ecosystem

(d). Pyramid of biomass of a grassland and pyramid of number of a tropical forest ecosystem

**Ans. (a)**

**(4). ** The rank/abundance plot given below illustrates three well known species abundance curves (a, b, c).

Based on the shapes of the curves select the correct option. (CSIR_2017_II)

(a). a-exponential, b-log normal, c-geometric series

(b). a-broken stick, b-geometric series, c-log normal

(c). a-broken stick, b-log normal, c-geometric series

(d). a-exponential, b-geometric series, c-log normal

**Ans. (c)**

**(5). ** Three species M, N and O when grown independently in a laboratory showed typical logistic growth curves. However, when grown in pairs, the following growth curves were observed.

What interpretation regarding the interspecific relationship between M, N and O can be deduced from the above observations? (CSIR_2017_II)

(a). N predates over O and therefore can also predate on M.

(b). N is competed out by M and O.

(c). N and O possibly have a prey-predator relationship.

(d). M and O exhibit prey-predator relationship.

**Ans. (c)**

**(6).** Temporal isolation in breeding seasons between closely related species leads to reproductive isolation. Given below are breeding seasons of different species of frogs.

Which of the above plots represents temporal isolation in breeding seasons among closely related sympatric species? (CSIR_2017_II)

(a). Plot A

(b). Plots A and B

(c). Plots B and C

(d). Plots A and C

**Ans. (c)**

**(7).** Given below are the population pyramids of three different populations A, B and C depicting the relationship between birth and death rates in each.

Based on the population pyramids given above, which one of the following is INCORRECT? (CSIR_2017_II)

(a). Population B has slower growth rate than population A.

(b). Population C has birth rate higher than its death rate.

(c). Population A represents a rapidly growing population.

(d). Population B has the highest death rate among the three populations.

**Ans. (b)**

**(8).** Given below are names of some of the National Parks of India and their key protected animals.

Based on the table given above, which of the following options represents the correct match? (CSIR_2017_II)

(a). A-(iii); B-(i); C-(iv); D-(ii); E-(v)

(b). A-(i); B-(ii); C-(v); D-(iii); E-(iv)

(c). A-(i); B-(ii); C-(iii); D-(iv); E-(v)

(d). A-(iii); B-(i); C-(v); D-(ii); E-(iv)

**Ans. (d)**

**(9). ** Given below are two patterns of ecological succession. Four species are represented by A, B, C and D. An arrow indicates “is replaced by”.

In the context of ecological succession, which of the following statements is INCORRECT with respect to the figures given above.

(a). Model – X represents facilitation model and Model – Y represents tolerance model.

(c). Model – X represents tolerance model and Model – Y represents inhibition model.

(d). As per Model – Y, C can out-compete B but can also invade a habitat in their absence.

(e). As per the Model – X, A makes the environments more suitable for B to invade.

**Ans. (b)**

**(10). ** Given below are the species accumulation curves and rarefaction curves measured in an ecological community.

Which one of the following statements is INCORRECT about the two curves? (CSIR_2017_II)

(a). Species accumulation curve moves from left to right and rarefaction curve moves from right to left.

(b). Species accumulation curve represents the total species richness of the assemblage.

(c). Rarefaction curve represents the mean of repeated resampling of all pooled samples.

(b). Rarefaction curve is the realized accumulation value of the total species in a community.

**Ans. (d)**

**(11). ** In the following equations: (CSIR_2015_II)

(A). dN/dt = rN

(B). Nt = N0ert

(C). dN/dt = rN((K-N)/K)

(D). dN/dt – rN X N/K

Exponential population growth is described by

(a). (A) and (B)

(b). (A) only

(c). (C) Only

(d). (B) and (D)

**Ans. (a)**

**(12). ** A species whose life history strategies allow for high intrinsic rates of increase (strategist) will also exhibit the following EXCEPT (CSIR_2017_II)

(a). High tolerance for both environmental instability and low quality resources.

(b). Short period of exponential population growth (r)

(c). Reproductive strategy that involves random mating, semelparity and little or no parental investment

(d). Survivorship that show density-dependent mortality, typically exhibiting Type 1 or 2 survivorship curves.

**Ans. (d)**

**(13).** In the context of diversity patterns of species, which one of the following statements is INCORRECT? (CSIR_2017_II)

(a). Alpha diversity is diversity within a single community

(b). Beta diversity is a measure of the change in species composition from one community or habitat to another

(c). Alpha diversity is the regional diversity found among range of communities in a geographical region

(d). Gamma diversity is the regional diversity found among range of communities/habitats in a geographical region

**Ans. (c)**