An association between two individuals or populations where both are benefitted and where neither can survive without the other is

1

(a)

commensalism

(b)

amensalism

(c)

protocooperation

(d)

mutualism

If in a population, natality is balanced by mortality then there will be

1

(a)

decrease in population grwoth

(b)

zero population growth

(c)

increase in population growth 

(d)

over population

A population has more young individuals compared to the older individuals. What would be the status of the population after some years?

1

(a)

It will decline

(b)

It will stabilise

(c)

It will increase

(d)

It will first decline and then stabilise

Which of the following would necessarily decrease the density of a population in a given habitat?

1

(a)

Natality > mortality

(b)

Immigration > emigration

(c)

Mortality and emigration

(d)

Natality and immigration

A protozoan reproduces by binary fission. What will be the number of protozoans in its population after six generations?

1

(a)

128

(b)

24

(c)

64

(d)

32

In 2005, for each of the 14 million people present in a country,0.028 were born and 0.008 died during the year. Using exponential equation, the number of people present in 2015 is predicted as:

1

(a)

25 millions

(b)

17 millions

(c)

20 millions

(d)

18 millions

Amensalism is an association between two species where:

1

(a)

one species is harmed and other is benefitted

(b)

one species is harmed and other is unaffected

(c)

one species is benefitted and other is unaffected

(d)

both the species are harmed

Lichens are the associations of :

1

(a)

bacteria and fungus

(b)

algae and bacterium

(c)

fungus and algae

(d)

fungus and virus

Which of the following is a partial root parasite?

1

(a)

Sandal wood

(b)

Mistletoe

(c)

Orobanche

(d)

Ganoderma

Which one of the following organisms reproduces sexually only once in its life time?

1

(a)

Banana plant

(b)

Mango

(c)

Tomato

(d)

Eucalyptus