Home
Class 11
BIOLOGY
Which of the following is correct i. I...

Which of the following is correct
i. In a population birth rate and death rate refer to per capita births and death respectively
II. In nuature, we rerely find isolated single individuals of species
III. The size of population for any species is stable
IV. Ecological effects of any factors on a population growth are generally reflected in its size / population density

A

I and II

B

II and III

C

I,II and III

D

I,II and IV

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given statements about populations is correct, let's analyze each statement one by one: ### Step 1: Analyze Statement I **Statement I:** In a population, birth rate and death rate refer to per capita births and deaths respectively. - **Explanation:** This statement is correct. The birth rate is typically expressed as the number of births per individual in a population (per capita), and the death rate is similarly expressed as the number of deaths per individual. This allows for a more standardized understanding of population dynamics. ### Step 2: Analyze Statement II **Statement II:** In nature, we rarely find isolated single individuals of species. - **Explanation:** This statement is also correct. Most species are social or tend to live in groups, whether for mating, foraging, or protection. Isolated individuals are uncommon because many species have social structures or behaviors that encourage group living. ### Step 3: Analyze Statement III **Statement III:** The size of the population for any species is stable. - **Explanation:** This statement is incorrect. Population sizes fluctuate due to various factors such as availability of resources, predation, disease, and environmental changes. Populations can grow, shrink, or stabilize over time, but they are not inherently stable. ### Step 4: Analyze Statement IV **Statement IV:** Ecological effects of any factors on a population growth are generally reflected in its size/population density. - **Explanation:** This statement is correct. Changes in ecological factors, such as food availability, habitat space, and predation, will affect the population size and density. Therefore, population density is a direct reflection of these ecological impacts. ### Conclusion Based on the analysis: - **Correct Statements:** I, II, and IV are correct. - **Incorrect Statement:** III is incorrect. Thus, the correct answer is that statements I, II, and IV are correct. ### Final Answer The correct statements are: - I: Correct - II: Correct - III: Incorrect - IV: Correct
Promotional Banner

Similar Questions

Explore conceptually related problems

Assertion: In a population birth rates refers to per capital birth and death rate refers to per capita deaths. Reason: The birth and death rates expressed in change in numbers (increase or decrease) with respect to the members of the populations.

In a population per capita birth rate is 0.15 and per capita death rate is 0.08 during a unit time period. What is the value of r (intrinsic rate of natural increases) for the given population ?

Which of the following is correct ? I. Migration is the movement of individuals from a population to another population II. Emigration is the migration of individuals out of an area III. Immigration is the migration of individuals into an area IV Gene flow cannot alter the genetic charecteristics of populations

Which of the following are correct ? I. Population is group of individual organisms of the same species in a given area. II. An ecotype is a population of inidividuals of a species, which are genetically different. III. Environment is influnced by many biotic and abiotic factors. IV. Ecade is a place, where and organism lives.

Which of the following statements are correct? I. Mortality is the rate of loss of individuals per unit time due to death. II. Population dispersion affects the size of population. III. Age distribution influences both natality and mortality of the population. IV. Realised natality is the actual death rate found under existing conditions.

Which one is right for logistic model for population growth I. population growth rate increases as the size of population approaches the carrying capacity II. All individual have same effect on population growth III. There are unlimited natural resources IV. As population increases the competition goes on increasing select the correct combination.

If b is represent to birth rate If d is represent to death rate if dN is represent to increase or decrease in population size Then exponetial growth is represented by