Population Growth

Question 1

Population

Answer 1

Population is a group of organisms of the same species occupying a particular space at a particular time

Question 2

Population density

Answer 2

Population density is the number of individuals present in a given unit area at a given point of time

D= N/S ( where N= no of individuals and S= area)

Question 3

Natality

Answer 3

The inherent ability of the population to increase

Birth rate

Question 4

Mortality

Answer 4

Number of deaths in a population in a specific area with the passage of time

Question 5

Migration

Answer 5

Organisms moving in (immigration) and out (emigration) of the population)

Question 6

Carrying capacity

Answer 6

It is the amount of organisms within a region that the environment can support sustainably

Question 7

Population growth rate formula

Answer 7

r= (no. of births + immigrants)-(no. of deaths + emigrants) __________________________________________________________
no. of individuals in the population at the given time

r= [(B+I)-(D+E)]/N

Question 8

Two types of growth curves

Answer 8

1. J- shaped growth curve
2. S-shaped growth curve

Question 9

J-Shaped growth curve

Answer 9

1. Micro-environment
2. Artificial environment
3. Controlled environment
4. Optimum growth conditions
5. Only lag and log phase

BIOREACTOR

Question 10

S-Shaped growth curve

Answer 10

1. Macro-environment
2. Natural environment
3. Varied growth conditions
4. Four stages
   
   • Lag phase
   • Log phase
   • Stationary phase
   • Death phase

lalluram LSD (LLSD)

IN NATURE

Question 11

Age pyramid

Answer 11

Model that geometrically represents the proportions of different age groups in the population of any species. The ratio of the various age groups determines the reproductibe status of the population

Question 12

Broad base age pyramid (expanding)

Answer 12

1. High fertility rate
2. Rapidly growing youth population
3. Health issues post retirement life

Question 13

Bell shaped pyramid (stable)

Answer 13

1. Moderate proportion of young and old
2. High reproductive index
3. Healthy population

Question 14

Urn shaped pyramid (declining)

Answer 14

1. Low percentage of young individuals
2. Reduced birth rate
3. Immigration and emigration does not affect the population

Question 15

Difference between habitat and niche

Answer 15

Habitat
1. A specific physical space occupied by a (species)
2. Same habitat may be shared by many (species)
3. Habitat specificity is exhibited by organisms

Niche
1. A functional space occupied by an organism in the same eco-system
2. A single niche is occupied by a single species
3. Organisms may change their niche with time and season

Question 16

Reproductive fitness

Answer 16

The ability of an organism to produce offspring during its lifespan. It is not just limited to the number of offspring produced but also the reproductive success of these offspring themselves

Question 17

Examples of reproductive fitness

Answer 17

1. Pacific salmon fish, Bamboo tree breed/flower only once in their lifetime
2. Strobilanthes kunthiana blooms once in 12 years
3. Mammals like dogs are seasonal breeders. They breed during the heat period ONLY