FREE NEET Biology Practice MCQ Test: Organisms And Populations Exercise 3 Questions Answers With Detailed Explanations [PDF]

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Organisms And Populations Topic Based

Question : 1

An association of individuals of different species living in the same habitat and having functional interactions is

Answer: (d)

Biological or biotic community is an assemblage of populations of different species of plants, animals, bacteria and fungi which live in a particular area and interact with one another through competition, predation, mutualism, etc. Each biotic community has a specific composition and structure, e.g., pond community.

Question : 2

Cuscata, a parasitic plant that is commonly found growing on hedge plants has lost its __________ and __________ in the course of evolution

Answer: (a)

Question : 3

Permafrost is the most distinctive feature of

Answer: (c)

Permafrost, a permanently frozen subsoil, is a distinctive characteristic of the tundra.

Question : 4

Seals have a thick layer of fat (blubber) below their skin that acts as an

Answer: (d)

Blubber is the fatty layer present between the skin and muscle of whales and other cetaceans. It acts as an insulator and protects the animal from heat loss and serves as a food reserve.

Question : 5

Two different species cannot live for long duration in the same niche or habitat. This law is

Answer: (a)

Gause's hypothesis states that two different competing species cannot coexist together for a long in the same niche, one has to get eliminated by the other competing species, if they do coexist, then they do so as a result of niche differentiation, i.e. differentiation of then realized niches.

Question : 6

Desert regions are characterized by ___ centimetres of rainfall per year.

Answer: (c)

Deserts have less than 25 centimetres of rainfall per year.

Question : 7

Environmental factor(s) that characterise the habitat of an organism is/are

Answer: (c)

Both biotic and abiotic components of an environment characterise the habitat of an organism. The most important abiotic components which influence the habitat of organisms are temperature, water, light and soil. Also, biotic components like pathogens, parasites, predators and competitors of the organisms of an ecosystem interact and influence their habitat.

Question : 8

Zero growth of population is indicated by

Answer: (c)

Zero growth of population is indicated when reproductive individuals are not reproducing and are present in equal number to pre-reproductive individuals.

Question : 9

In which one of the following habitats does the diurnal temperature of soil surface vary most?

Answer: (c)

Deserts are places where the diurnal temperatures vary greatly. It is extremely hot during the daytime and very cold at night. This change in temperature also affects the temperature condition of the soil.

Question : 10

Higher plants survive stressful conditions by reducing their __________ activity.

Answer: (a)

Question : 11

Match the following columns.

Column I(Population growth models)

Column II(Features)

A. Logistic growth1. Sigmoid growth
B. Exponential growth 2. Verhulst-Pearl logistic growth
 3. Geometric growth
 4. J-shaped growth

Codes A B

Answer: (a)

Question : 12

The sum total of the populations of the same kind of organisms constitute

Answer: (d)

The sum total of the populations of the same kind of organisms constitute species. A species is a group of individuals of same kind of phenotypic characters and can interbreed.

Question : 13

Some desert plants like __________ have no leaves.

Answer: (a)

Question : 14

A force acting against achievement of highest possible level of population growth is

Answer: (a)

Question : 15

Soil is composed of –

Answer: (c)

Question : 16

Individuals alive at the beginning of 1 year to 2 years age interval is 800. During this interval 200 individuals die. Then find out the death rate.

Answer: (d)

The death rate would be 0.25. It can be calculated in the following way,

Death rate = ${\text"Dead individual"}/{\text"Total individual"} = {200}/{800} = 1/4$ = 0.25

Question : 17

Find out the correct example of ectoparasite.

Answer: (d)

Question : 18

Gause's competitive exclusion principle states that

Answer: (a)

Question : 19

In general, which of the following appears to be more adversely affected by competition?

Answer: (d)

Question : 20

The reproductive fitness of a population in a certain habitat is also termed as __________

Answer: (a)

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