Organisms and P...

The density of a population in a given habitat during a given period, fluctuates due to changes in certain basic processes. On this basis, fill up boxes A and B in the given flow chart with correct option.

What does the shape of the given age pyramids reflects about the growth status of the related population?

The population growth is generally described by the following equation:

What does 'r' represent in the given equation?

The plant-animal interactions often involve co-evolution of the mutualists so that

Which type of interaction is represented by the given figure?

Species interaction with negative influence on both is referred to as 

In a pond, last year there were 30 lotus plants. Through reproduction, 25 new lotus plants were added in one year while 8 plants died. The birth and death rates for the lotus population respectively are ___ and ____ individuals per lotus per year.

Which of the following is not an example of using relative density to measure population density in a certain area?

Total number of individuals of a species per unit area and per unit time is called:

Percentage of individuals of a given age group in a given population is called as

Population ecology is an important area because it _____(i)_______ ecology to population genetics and _____(ii)________ 
identify (i) and (ii) in the above statement and select the correct option.

In a given population of 2000 individuals, 80 births and 125 deaths were reported over a given period of time. Which of the following graphs will correspond to it?

Parameters related to age structure include

The age structures of a population influences population growth because

Which of the following factors has a negative effect on the population growth rate?

If N  population density at time t, then population density at time t+1 can be written as

N_t +1=N_t +[(A+B)−(C+D)]
Select the correct option for A, B, C and D in the above equation. 

Which of the following is not a factor that would limit the growth of a population?

The given figure represents different factors affecting population density (N) If B = nasality, D = mortality, E = emigration and I = immigration; then select the incorrect option regarding these.

Exponential growth is observed in a population when

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 increase) for the given population?

The maximum possible number of individuals that a habitat can support is called its

Which of the following equations correctly represents verhulst-Pearl logistic growth?

Study the population growth curves (A and B) in the given graph and select the incorrect option

A population with a larger proportion of older individuals than younger ones will likely to

In a life table, the number of individuals alive at the beginning of the 1 st year to 2 nd year interval is 800. During this interval, 200 individuals die. The death rate for this interval is 

Which type of interaction is being shown in the given figure?

Obligate parasites are those organisms which

The interdependent evolution of flowering plants and pollinating insects together is known as

When two similar species live in the same area, they may evolve to become more different in order to ________________.

Do humans exhibit any mutualistic relationships?

Human cells contain mitochondria, which are responsible for producing the energy needed by our cells. Remember that the ancestors of mitochondria may once have been free-living prokaryotes. If mitochondria were still considered to be seperate organisms within our cells, which of the following would best describe our relationship with them?

Refer to the given table. If '+' sign has been assigned for beneficial interaction, sign for detrimental interaction and '0' for neutral interaction, identify the type of interaction (i), (ii) and (iii) and select the correct option.

Read the following statements and select the correct option.
Statement 1: Brood parasitism in birds is an example of parasitism in which the parasitic bird lays its eggs in the nest of its host and the host incubates them.
Statement 2: During the course of evolution, the eggs of the parasite bird have evolved to resemble the host's eggs in size and colour to reduce the chances of the host bird detecting the foreign eggs and removing them from the nest.

The prickly pear cactus became unusually abundant after its introduction in Australia, because it _________________.

Why you never see cattle or goats browsing on weed Calotropis?

 Choose the wrong statements

In laboratory experiments, two species of the protist Paramecium (species 1 and 2) were grown alone and in the presence of the other species. The following graphs show growth of species 1 and species 2, both alone and when in mixed culture with the other species.

Which of the following conclusions can be drawn from the graphs?

The birth and death rates of four counteries are given below. which one will have the least population growth rate?

Refer to the given table that summarises the interactions between two organisms (organisms 1 and organism 2). Identify the types of interaction (A,B and C) and select the correct answer.

(i) A can be either predation or parasitism 
(ii) B can be either commensalism 
(iii) C can be amensalism. 
(iv) A can be amensalism, 

Which of the following is not an example of prey-predator relationship?