Chapter 13: Organisms and Populations

What would be the per cent growth or birth rate per individual per hour

for the same population mentioned in the previous question

(Question 10)?

a. 100

b. 200

c. 50

d. 150

A population has more young individuals compared to older

individuals. What would be the status of the population after some years?

a. It will decline

b. It will stabilise

c. It will increase

d. It will first decline and then stabilize

What parameters are used for tiger census in our country’s national

parks and sanctuaries?

a. Pugmarks only

b. Pugmarks and faecal pellets

c. Faecal pellets only

d. Actual headcounts

Which of the following would necessarily decrease the density of a

population in a given habitat?

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?

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 the exponential equation,

the number of people present in 2015 is predicted as:

a. 25 million

b. 17 million

c. 20 million

d. 18 million

Amensalism is an association between two species where:

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 an association of:

a. bacteria and fungus

b. alga and bacterium

c. fungus and alga

d. fungus and virus

Which of the following is a partial root parasite?

a. Sandalwood

b. Mistletoe

c. Orobanche

d. Ganoderma

Which one of the following organisms reproduces sexually only once in

its lifetime?

a. Banana

b. Mango

c. Tomato

d. Eucalyptus