Population Density

Q.

Name three problems that the newly independent nation of India faced.

Q. If in a pond there were $40$ lotus plants last year and through reproduction $16$ new plants are added, taking the current population to $56$, now the birth rate will be

1. $0.5$
2. $1.6$
3. $5.6$
4. $0.4$

Q. Factors that affect population density are

1. Birth rate
2. Death rate
3. None of these
4. Immigration
5. All of these
6. Emigration

Q.

Reasons for high population growth in India include:

I. Preference for female kids
II. Non-availability of contraceptives
III. Little or no family planning
IV. Low birth rate and high death rate

1. I, IV
2. I, II, III
3. II, III, IV
4. II and III

Q.

If the current population size of bison is $3652$ and the maximum growth rate of the population is $0.28$, calculate the population size after one year and determine whether the park will need to take measures to control the population.

Q.

Study the schematic representation given above and answer the following questions:

a) Identify A in it.

b) Identify D in it.

c) When the population density at time t is N as shown above, write the population density at time t + 1 in the form of an equation using appropriate symbols. [3 marks]

Q. In the year 2000, India’s population reached close to the 1 billion mark. Possible reason(s) for this is decline in:
A. Maternal mortality rate (MMR)
B. Infant mortality rate (IMR)
C. Number of people of reproducible age
D. Death rate

1. A and B only
2. D only
3. A, B and D
4. B and C only

Q.

Growth of the population of an area depends on

1. Natality rate

2. Immigration

3. Environmental resistance

4. All of the these

Q. A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is :

1. 10
2. 15
3. 5
4. Zero

Q.

Gene frequency, gene flow, population density, age distribution, over population are the attributes of

1. community

2. population

3. groups

4. individuals

Q. Species are reproductively isolated when they are

1. Flowering at different times
2. Growing together in the same area
3. Interfertile
4. Growing to different heights

Q. Fill in the blanks
1. ___(i) ___ is the rate at which new individuals are added to a population by reproduction.
2. ___ (ii) ___ is the rate at which individuals are lost by death.
3. ___ (iii) ___ refers to individuals moving away from each other.
4. ___ (iv)___ refers to individuals moving out of a population.
5. ___ (v) ___ refers to individuals moving into a population.

1. (i) Immigration (ii) Emigration (iii) Dispersal (iv) Mortality (v) Natality
2. (i)Natality (ii)Mortality (iii)Dispersal (iv)Emigration (v)Immigration
3. (i)Immigration (ii)Natality (iii)Dispersal (iv)Mortality (v)Emigration
4. (i)Dispersal (ii)Emigration (iii)Immigration (iv)Mortality (V)Natality

Q. Assertion: Population density is sometimes measured in terms of biomass.
Reason: In certain cases, measuring the number of individuals to estimate the population density may underestimate the role of certain organisms.

1. Both assertion and reason are true and reason is the correct explanation of the assertion
2. Both assertion and reason are true but reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false
4. Both assertion and reason are false

Q. The maximum number of individuals of a population that can be sustained in a given habitat represents its _____________.

1. Darwinian fitness
2. intrinsic rate of natural increase
3. carrying capacity
4. population density

Q.

In a population curve, the rate of growth becomes steady towards the end of the exponential curve due to

1. Reproductive power is reduced

2. Environmental stress

3. All of the these

4. Migration

Q. Presence of tail and coarse hair in human baby is

1. Crossing over
2. Atavism
3. Mutation
4. Radiation

Q. (a) List the different attributes that a population has and not an individual organism.
(b) What is population density? Explain any three different ways the population density can be measured, with the help of an example each. [5]

Q. Factors that affect population density are

1. Birth rate
2. Death rate
3. Emigration
4. Immigration
5. All of these
6. None of these

Q.

The percentage ratio of natality over mortality is called

1. None of the above

2. Population density

3. Total count

4. Vital index

Q. The number of individuals per unit area determines a population's

1. Density
2. Survivorship
3. Age Structure
4. Mortality

Q. Define life span of an organism. Mention the life span of (i) crocodile (ii) crow (iii) parrot & (iv) butterfly.

Q. There were 18 parrots in a garden last year, 8 new parrots were added to the population this year through reproduction, taking the population to 26. Calculate the birth rate of the population for the specified time period.

1. 0.3
2. 0.4
3. 0.6
4. 0.8

Q. List any three advantages of small family.

Q. If in a pond there were $40$ lotus plants last year and through reproduction $16$ new plants are added, taking the current population to $56$, now the birth rate will be

1. $5.6$
2. $0.4$
3. $0.5$
4. $1.6$

Q.

State three advantages of a small family.

Q. Which of the following equations best represents the formula for calculating the change in population density?

1. $N_{t+1}=N_t+\left[\right(B+D)-(I+E\left)\right]$
2. $N_t=N_{t+1}+\left[\right(B+D)-(I+E\left)\right]$
3. $N_{t+1}=N_t+\left[\right(B+I)-(D+E\left)\right]$
4. $N_{t+1}=N_t+\left[\right(B+I)+(D+E\left)\right]$

Q. The number of individuals per unit area determines a population's

1. Density
2. Survivorship
3. Age Structure
4. Mortality

Q. With decrease in temperature oxyhaemoglobin curve will become

Q. Which of the following is true for immigration?

1. None of the above
2. Outflow of population
3. Inflow of population
4. Inflow of population by reproduction

Q.

Give 2 advantages of having a small family