Organisms and Populations Test

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Organisms and Populations Test - 30

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Weekly Quiz Competition

Question 1
1 / -0

Recently the human population has grown almost exponentially becoming about 7 billion because of

A
Recent agricultural revolution

B
Industrial revolution

C
Major scientific and medical advances reducing mortality rate

D
All of the above

Solution

The increasing demographic index is a major obstacle for developing economy like India. The world population (the total number of living humans on Earth) was 7.244 billion as of July 2014 according to the medium fertility estimate by the United Nations Department of Economic and Social Affairs, Population Division and it is projected to reach 7.325 billion in July 2015.
The increase in the population rate is mainly due to the factors like agricultural revolution, industrial revolution and major scientific and medical advances in reducing the mortality rate. Life span of human beings had increased tremendously. Thus, the correct answer is option D.
Question 2
1 / -0

An interaction between two individuals where one is benefitted while the other is neither benefitted nor harmed is called as

A
Predation

B
Symbiosis

C
Scavenging

D
Commensalism

E
Parasitism

Solution

In ecology, commensalism is a class of relationships between two organisms where one organism benefits from the other without affecting it. This is in contrast with mutualism, in which both organisms get benefits from each other, amensalism, where one is harmed, while the other is unaffected, and parasitism, where one benefits while the other is harmed.
Thus, the correct answer is option D.
Question 3
1 / -0

Altruism is shown by

A
Vertebrates

B
Honeybee

C
Wasps

D
Both B and C

Solution

Altruistic behaviour is common particularly in species with complex social structures. For example: bees, ants, wasps and termites. Honeybees (Apis mellifera) form one of the most complex animal societies. Within a colony, the single queen is typically the sole reproductive. If a honeybee colony loses its queen, worker bees develop their ovaries and produce male offspring. In this phase, the only reproductive options available to workers are to produce their own male offspring (workers cannot mate, and their haploid eggs develop into males) or assist other workers in reproducing. Under such conditions, the level of altruism displayed by workers is expected to increases the degree of reproduction. It is commonly assumed that reproductive workers selfishly prioritize their own reproduction over colony tasks.
Question 4
1 / -0

The age and distribution of a population is determined by the

A
Timing of births and deaths

B
The rate at which population is growing

C
Both (A) and (B)

D
None of the above

Solution

The age and distribution of a population are determined by the timing of births and deaths and the rate at which population is growing.
Population dynamics are influenced by age structure, which is the characteristic for populations growing at different rates.
Age structure varies according to the age distribution of individuals within a population.
A population's growth rate is strongly influenced by the proportions of individuals of particular ages.
Question 5
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Which one of the following is most appropriately defined?

A
Host is an organism which provides food to another organism.

B
Amensalism is a relationship in which one species is benefited whereas the other is unaffected.

C
Predator is an organism that catches and kills other organism for food.

D
Parasite is an organism which always lives inside the body of other organism and may kill it.

Solution

In an ecosystem, the biotic and the abiotic components depend upon each other for their survival needs.Predators are those animals, that live by preying on other organisms for food. Many predators hunt and eventually kill their prey, such as lion preying upon a buffalo, mantis eating a bee, baleen whale consuming millions of microscopic planktons, etc.
Question 6
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To keep a population balanced; the reproduction is a phenomenon, another opposite to keep it less is

A
Biotic control

B
Mortality

C
Fecundity

D
Normality

Solution

Mortality is the state of being mortal, or susceptible to death; the opposite of immortality. Reproduction and mortality will balance a population, the alteration in both will lead to several situations like exponential population growth, declining populations growth, etc.
So, the correct answer is option B.

Question 7

1 / -0

Different types of interactions and the nature of interactions between species A and B are given in column I and II respectively. Choose the correct answer from the answer key.

Column I	Column II
a. Mutualism	p. Beneficial to A and no effect for B
b. Competition	q. Beneficial to both A and B
c. Parasitism	r. Beneficial to A and inhibitory for B
d. Predation	s. Beneficial to A and harmful to B
e. Commensalism	t. Harmful to both A and B

a- t, b- s, c- p, d- q, e- r

a- q, b- r, c- t, d- s, e- p

a- q, b- t, c- s, d- r, e- p

a- r, b- p, c- q, d- s, e- t

a- s, b- q, c- t, d- p, e- r

Solution

Mutualism is the relationship in which each individual benefits from the activity of the other (Beneficial to both A and B).
Competition is a contest between organisms, animals, individuals, groups, etc., for territory, a niche, or a location of resources, for resources and goods, mates, for prestige, recognition, awards, or group or social status, for leadership (Harmful to both A and B).
Parasitism is a relationship between species, where one species, the parasite, benefits at the expense of the other, the host (Beneficial to A and harmful to B).
Predation is a biological interaction where a predator (an organism that is hunting) feeds on its prey (the organism that is attacked). Predators may or may not kill their prey prior to feeding on them, but the act of predation often results in the death of its prey and the eventual absorption of the prey's tissue through consumption (Beneficial to A and inhibitory for B).
Commensalism is a relationship between two organisms where one organism benefits from the other without affecting it (Beneficial to A and no effect for B).

Therefore, the correct answer is option C.

Question 8
1 / -0

Most of the invertebrates and plant populations have

A
Less biotic potential

B
More biotic potential

C
High mortality rate in the younger stages

D
Both B and C

Solution

Invertebrates and plant populations have more biotic potential and high mortality rate in younger stages.
Biotic potential is the maximum reproductive capacity of a population under optimum environmental conditions. Full expression of the biotic potential of an organism is restricted by environmental resistance, any condition that inhibits the increase in a number of the population. It is generally only reached when environmental conditions are very favorable. A species reaching its biotic potential would exhibit exponential population growth and be said to have a high fertility, that is, how many offspring are produced per mother. High mortality rates in the invertebrates as well as plant species result in the decline of their number.
So, the correct answer is option D.
Question 9
1 / -0

If the strong partner is benefited and the weak partner is damaged, the relationship is known as

A
Predation

B
Symbiosis

C
Commensalism

D
Allotrophy

Solution
Question 10
1 / -0

Green plants in a forest ecosystem are

A
Suppliers of food and $$O_2$$

B
Consumers of nutritive materials

C
Consumers of animal proteins

D
Suppliers of timber

Solution

All living creatures depend on plants to survive. Through photosynthesis, plants convert energy from sunlight into food stored as carbohydrates. Because animals cannot get energy directly from the sun, they must eat plants to survive. Plants also provide the oxygen humans and animals breathe, because plants use carbon dioxide for photosynthesis and release oxygen into the atmosphere.

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Re-Attempt Weekly Quiz Competition

Organisms and Populations Test - 30

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Organisms and Populations Test - 30

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Question 1

Recent agricultural revolution

Industrial revolution

Major scientific and medical advances reducing mortality rate

All of the above

Solution

Question 2

Predation

Symbiosis

Scavenging

Commensalism

Parasitism

Solution

Question 3

Vertebrates

Honeybee

Wasps

Both B and C

Solution

Question 4

Timing of births and deaths

The rate at which population is growing

Both (A) and (B)

None of the above

Solution

Question 5

Host is an organism which provides food to another organism.

Amensalism is a relationship in which one species is benefited whereas the other is unaffected.

Predator is an organism that catches and kills other organism for food.

Parasite is an organism which always lives inside the body of other organism and may kill it.

Solution

Question 6

Biotic control

Mortality

Fecundity

Normality

Solution

Question 7

a- t, b- s, c- p, d- q, e- r

a- q, b- r, c- t, d- s, e- p

a- q, b- t, c- s, d- r, e- p

a- r, b- p, c- q, d- s, e- t

a- s, b- q, c- t, d- p, e- r

Solution

Question 8

Less biotic potential

More biotic potential

High mortality rate in the younger stages

Both B and C

Solution

Question 9

Predation

Symbiosis

Commensalism

Allotrophy

Solution

Question 10

Suppliers of food and $$O_2$$

Consumers of nutritive materials

Consumers of animal proteins

Suppliers of timber

Solution

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