In a growing population of a country

pre-reproductive individuals are more than reproductive individuals.

reproductive individuals are less than post-reproductive individuals.

reproductive and pre-reproductive individuals are equal in number.

pre-reproductive individuals are less than reproductive individuals.

It is much easier for a small animal to run Uphill than for a large animal, because

smaller animals have a higher metabolic rate

small animals have a lower O 2 requirement

the efficiency of muscles in large animals is less than in the small animals

it is easier to carry a small body weight

Match the items in Column-I with those in Column-II : Column I Column II (a) Herbivores-Plants (i) Commensalism (b) Mycorrhiza-Plants (ii) Mutualism (c) Sheep-Cattle (iii) Predation (d) Orchid-Tree (iv) Competition Select the correct option from following :

(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)

(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

In the exponential growth equation N t =N 0 e rt , e represents :

The base of geometric logarithms

The base of exponential logarithms

produces haustoria that insert themselves into the vascular system of the host

is capable of living in oligotrophic soils by getting nitrogen from insectivory

is a typical ephemeral that complete their life cycle over many years

is a succulent carrying out CAM photosynthesis

Botany - Organisms Populations - Quiz-8

According to Darwin, organic evolution is due to:

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Interspecific competition
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Competition within closely related species.
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Reduced feeding efficiency in one species due to the presence of interfering species.
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Intraspecific competition

What type of human population is represented by the following age pyramid?

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Stable population
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Declining population
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Expanding population
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Vanishing population

Which one of the following is categorized as a parasite in true senses?

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Human foetus developing inside the uterus draws nourishment from the mother
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Head louse living on the human scalp as laying eggs on human hair
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The cuckoo (koel) lays its eggs in crow's nest
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The female Anopheles bites and sucks blood from humans

Formation of tropical forests needs mean annual temperature and mean annual precipitation as:

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18 – 25^oC and 150 - 400cm
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5 – 15^oC and 50 – 100 cm
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30 – 50^oC and 100 – 150cm
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5 – 15^oC and 100 – 200 cm

The table below gives the populations(in thousands) of ten species(A--J) in four areas (a-d) consisting of the number of habitats given within brackets against each. Study the table and answer the question which follows:
which area out of a to d shows maximum species diversity?

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b
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c
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a
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d

The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?

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S-shaped or sigmoid growth of this insect
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the food plants mature and die at the end of the rainy season
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Its population growth curve is of J-type
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The population of its predators increases enormously

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur :

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a normal distribution
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a bi-modal distribution
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a T-shaped curve
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a skewed curve

Which two of the following changes (a-d) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?
(a) Increase in red blood cell size
(b) Increase in red blood cell production
(c) Increased breathing rate
(d) Increase in thrombocyte count
Changes occurring are

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(a) and (d)
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(a) and (b)
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(b) and (c)
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(c) and (d)

Carnivorous animals - lions and leopards, occupy the same niche but lions predate mostly larger animals and leopards take smaller ones. This mechanism of competition is referred to as -

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Character displacement
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Altruism
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Resource partitioning
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Competitive exclusion

Between which among the following, the relationship is not an example of commensalism?

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Orchid and the tree on which it grows
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Cattle Egret and grazing cattle
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Sea Anemone and Clown fish
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Female wasp and fig species

Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their:

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Growth response
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Defence action
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Effect on reproduction
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Nutritive value

Which of the following is not an attribute of a population?

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Natality
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Mortality
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Species interaction
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Sex ratio

The process of growth is maximum during:

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Lag phase
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Senescence
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Dormancy
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Log phase

Match the items in Column-I with those in Column-II :

Column I Column II

(a) Herbivores-Plants (i) Commensalism

(b) Mycorrhiza-Plants (ii) Mutualism

(d) Orchid-Tree (iv) Competition

Select the correct option from following :

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(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
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(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
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(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
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(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)

The impact of immigration on population density is:-

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Negative
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Both positive and negative
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Neutralized by natality
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Positive

Inspite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

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Mutualism
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Predation
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Resource partitioning
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Competitive release

Amensalism can be represented as:

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Species A (-) : Species B (-)
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Species A (+) : Species B (0)
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Species A (-) : Species B (0)
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Species A (+) : Species B (+)

In the exponential growth equation N_t =N₀e^rt, e represents :

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The base of natural logarithms
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The base of geometric logarithms
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The base of number logarithms
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The base of exponential logarithms

Match List-I with List-II

List-I	List-II
(a) Allen's Rule	(i) Kangaroo rat
(b) Physiological adaptation	(ii) Desert lizard
(c) Behavioural adaptation	(iii) Marine fish at depth
(d) Biochemical adaptation	(iv) Polar seal

Choose the correct answer from the options given below.

	(a)	(b)	(c)	(d)
1.	(iv)	(i)	(ii)	(iii)
(iv)	(iii)	(ii)	(i)
3.	(iv)	(ii)	(iii)	(i)
4.	(iv)	(i)	(iii)	(ii)

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1
0%
2.
0%
3
0%
4

Assertion (A) : A person goes to high altitude and experiences 'altitude sickness' with symptoms like breathing difficulty and heart palpitations.

Reason (R) : Due to low atmospheric pressure at high altitude, the body does not get sufficient oxygen.

In the light of the above statements, choose the correct answer from the options given below.

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(A) is true but (R) is false
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(A) is false but (R) is true
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Both (A) and (R) are true and (R) is the correct explanation of (A)
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Both (A) and (R) are true but (R) is not the correct explanation of (A)

An epiphyte is a plant that:
I. grows on other plants for physical support
II. affects the host negatively

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Only I is correct
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Only II is correct
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Both I and II are correct
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Both I and II are incorrect

Cuscuta [dodder]:

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is capable of living in oligotrophic soils by getting nitrogen from insectivory
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produces haustoria that insert themselves into the vascular system of the host
0%
is a typical ephemeral that complete their life cycle over many years
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is a succulent carrying out CAM photosynthesis

Calotropis are avoided by the grazing herbivores because they produce:

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stipules
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thorns
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mustard oils
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cardiac glycosides

Semelparity is a reproductive strategy also known as "big bang" reproduction. This is because the single reproductive event of semelparous organisms is usually large as well as fatal. A classical example is seen in:

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Most perennial plants
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Mollusks
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Pacific salmon
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Humans

The mean annual precipitation is most variable in:

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Tropical forest
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Desert
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Grassland
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Arctic tundra

Consider the given statements:
I.   Temperature is the most important ecologically relevant environmental factor.
II.   Animals living in aquatic environment do not face any water related problems.
III.   Photoperiod has no effect on animal reproduction.

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Only II and III are correct
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Only I is correct
0%
Only I and III are correct
0%
Only III is correct

If the core body temperature of a human body goes below 37 ^oC, the feedback mechanism elicited to bring the temperature back to normal will include:

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Vasoconstriction and sweating
0%
Vasodilation and sweating
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Vasoconstriction and shivering
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Vasodilation and shivering

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Practice Botany Quiz Questions and Answers

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Practice Botany Quiz Questions and Answers

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