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Botany MCQs for NEET — Practice Questions with Answers

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Which of the following factors plays a direct role in limiting exponential growth and transforming it into logistic growth?

A. Per capita birth rates exceeding per capita death rates. B. Unlimited availability of food and space. C. Scarcity of resources, leading to competition. D. Decreased predation pressure.

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Explanation

The context states: 'No population of any species in nature has at its disposal unlimited resources to permit exponential growth. This leads to competition between individuals for limited resources.' This scarcity of resources is what drives the shift to logistic growth.

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The logistic growth equation is given by $dN/dt = rN((K-N)/K)$. What happens to the growth rate ($dN/dt$) if the population density (N) is very small compared to the carrying capacity (K)?

A. The growth rate approaches zero. B. The growth rate becomes negative. C. The growth rate is nearly exponential. D. The growth rate becomes constant at K.

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Explanation

If N is very small compared to K, then $(K-N)/K$ is approximately equal to $K/K = 1$. In this scenario, the logistic growth equation $dN/dt = rN((K-N)/K)$ simplifies to approximately $dN/dt = rN$, which is the equation for exponential growth. Thus, the growth rate is nearly exponential.

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Which of the following scenarios best defines competition in an ecological context, according to the provided text?

A. A process where two species consume the same limited resource. B. An interaction where the feeding efficiency of one species is reduced due to the presence of another, even if resources are abundant. C. A process where the 'r' (intrinsic rate of increase) of one species is significantly lower in the presence of another species. D. An event where one species directly attacks and kills another for resources.

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Explanation

The text states: 'Therefore, competition is best defined as a process in which the fitness of one species (measured in terms of its â€˜râ€™ the intrinsic rate of increase) is significantly lower in the presence of another species.' While options 1 and 2 describe aspects of competition, option 3 provides the most precise and comprehensive definition given in the context.

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Gause's 'Competitive Exclusion Principle' states that:

A. Two closely related species can coexist indefinitely if resources are abundant. B. Two closely related species competing for the same resources cannot co-exist indefinitely, and the competitively inferior one will be eliminated. C. Unrelated species are more likely to be eliminated due to competition than related species. D. Competition primarily occurs when resources are unlimited.

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Explanation

The text clearly states: 'Gauseâ€™s â€˜Competitive Exclusion Principleâ€™ states that two closely related species competing for the same resources cannot co-exist indefinitely and the competitively inferior one will be eliminated'.

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Which of the following is an example of 'competitive release'?

A. Two species sharing resources by partitioning them to avoid competition. B. The disappearance of a species after a superior competitor is introduced. C. A species expanding its geographical range dramatically after the experimental removal of a competing species. D. An increase in the intrinsic rate of natural increase ('r') of a species following an increase in resource availability.

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Explanation

The text defines 'competitive release' as: 'A species whose distribution is restricted to a small geographical area because of the presence of a competitively superior species, is found to expand its distributional range dramatically when the competing species is experimentally removed.'

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In Connell's elegant field experiments on the rocky sea coasts of Scotland, which barnacle species dominated the intertidal area?

A. Chathamalus B. Balanus C. Both Chathamalus and Balanus co-existed equally. D. Neither, as predation was the primary factor.

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Explanation

The text mentions: 'Connellâ€™s elegant field experiments showed that on the rocky sea coasts of Scotland, the larger and competitively superior barnacle Balanus dominates the intertidal area, and excludes the smaller barnacle Chathamalus from that zone.'

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The extinction of the Abingdon tortoise in the Galapagos Islands following the introduction of goats is cited as an example of:

A. Resource partitioning B. Competitive exclusion C. Commensalism D. Mutualism

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Explanation

The text provides this as 'persuasive circumstantial evidence' for competitive exclusion: 'The Abingdon tortoise in Galapagos Islands became extinct within a decade after goats were introduced on the island, apparently due to the greater browsing efficiency of the goats.'

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According to the text, for competition to occur, resources:

A. Must always be limiting. B. Need not be limiting, as seen in interference competition. C. Are irrelevant, as it's solely about direct conflict. D. Are primarily a factor only in laboratory experiments.

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Explanation

The text explicitly states: 'resources need not be limiting for competition to occur; in interference competition, the feeding efficiency of one species might be reduced due to the interfering and inhibitory presence of the other species, even if resources (food and space) are abundant.'

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Which of the following interactions results in both species suffering a negative impact?

A. Predation B. Parasitism C. Competition D. Commensalism

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Explanation

The summary section states: 'Depending on the outcome, these interactions between two species are classified as competition (both species suffer)...' and also earlier mentions 'both lose in competition in their interactions with each other.'

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In the context of organic evolution, Darwin considered interspecific competition as:

A. A minor factor in speciation. B. A potent force in organic evolution. C. An interaction limited to closely related species. D. Primarily a mechanism for resource distribution.

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Explanation

The text states: 'When Darwin spoke of the struggle for existence and survival of the fittest in nature, he was convinced that interspecific competition is a potent force in organic evolution.'

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