Organisms and Populations Test

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Organisms and Populations Test - 61

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Weekly Quiz Competition

Question 1
1 / -0

Organisms show migration in order to avoid unfavorable conditions of

A
temperature

B
food availability

C
precipitation

D
All of these

Solution

The seasonal movement of complete populations of animals to a more favorable is called migration It is usually in response to uneven precipitation and lower temperatures resulting in a reduced food supply and is often triggered by a change in day length. Migration is common in mammals. (e.g. porpoises), fish (e.g. eels and salmon) and some insects but is most marked in birds.
Question 2
1 / -0

A parasite that lives within a plant tissue is called as

A
ectoparasite

B
endoparasite

C
epiphyte

D
hydrophyte
Solution
- A parasite that lives within a plant tissue is called endoparasite.
- All parasitic plants have modified roots, called haustoria, which penetrates the host plants, connecting them to the conductive system – either the xylem, the phloem, or both. The haustorium penetrates the tissues of a plant(host) and absorbs nutrients and water. For example, include broomrape, dodder, Rafflesia, and Hydnoraceae.
- Hence A parasite that lives within a plant tissue is called as endoparasite.
- So, the correct answer is 'Endoparasite'.
Question 3
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Penicilium does not allow the growth of Staphylococcus bacterium and Tridchoderma stops the growth of fungus Aspergillus. This type of biotic interaction is called:

A
parasitism

B
amensalism

C
commensalism

D
competition.

Solution

Ammensalism is a type of association in which one organism in the association is harm and second is not affected.
It is of two type-
Antibiosis-where some microorganisms secrete certain chemical substances which killer enable another microorganism. The substances are known as antibiotics on the phenomena is known as antibiotics.

So, the correct option is 'amensalism'
Question 4
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Read the following statements about adaptations in desert plants and select the correct ones.
(i) They have a thick cuticle on their leaf surface
(ii) They have stomata present in deep sunken pits.
(iii) They use CAM pathway for photosynthesis.
(iv) They have flattened stems and large sized leaves.
(v) Their stomata remain closed during the day.

A
(i), (ii) and (iii)

B
(ii), (iii) and (v)

C
(i), (ii) and (iv)

D
(i), (ii), (iii) and (v)
Solution
Xerophytes can withstand a prolonged period of drought, for this purpose they have certain peculiar adaptations.
A thick cuticle is present in these plants. Stomata are generally sunken (deep-seated) and open during the night only.
They have a CAM pathway for photosynthesis.
Leaves are generally small and scaly. Sometimes leaves are modified into spines to reduce water loss through transpiration.
They generally have an extensive root system and a smaller shoot system.
Stems may be modified to phylloclades or cladodes to carry out the function of photosynthesis.
So, the correct answer is '(i), (ii), (iii) and (v)'.

Question 5

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Match the following and select the correct combination from the given options.

	Column I (Population interaction)		Column II (Examples)
A.	Mutualism	(i)	Tick on dogs
B.	Commensalism	(ii)	Balanus and Chathamalus
C.	Parasitism	(iii)	Sparrow and any seed
D.	Competition	(iv)	Epiphyte on a mango branch
E.	Predation	(v)	Mycorrhiza

$$A-(i), B-(v), C-(iv), D-(iii), E-(ii)$$

$$A-(ii), B-(i), C-(v), D-(iv), E-(iii)$$

$$A-(iii), B-(ii), C-(i), D-(v), E-(iv)$$

$$A-(v), B-(iv), C-(i), D-(ii), E-(iii)$$

Solution

(i) Ticks on dogs- The ticks present on the dogs body are to suck blood which acts the source of nutrition for them in which the ticks act as a parasite while the dogs the hosts.hence it shows parasitism

(ii) Balanus and chathamalus- Balanus outcompetes chthamalus by crowding bt chthamalus occurs in the high tide levels were balanus cannot where both balanus and chthamalus are the species of barnacle. It shows competition within the species.

(iii) Sparrow and any seed- the sparrow or in that case any granivores whose preys are seed or grains preadte on plants thus leading to plant-animal interaction thus performing predatorship. It shows predation .

(iv) Epiphyte on mango branch- epiphyte are the plants which which grow on other plants leaving the host unaffected by its present here the epiphyte such as orchids grown on mango plant where it is neither harmed nor benefitted .It shows commensalism.

(v) Mycorrhiza- It is the association between the fungus and the roots of the vascular plants where both are benefited equally none of them is harmed.This is an example of mutualism or symbiotic association.

so the correct ans is ' D A-(v),B-(iv),C-(i),D-(ii),E-(iii)

Question 6
1 / -0

Parameters related to age structure include

A
fecundity (birth rate)

B
generation time

C
death rate

D
All of these

Solution

The age structure of a population is the percentage of individuals of different ages such as young, adult and old.
Age structure is shown by organisms in which individuals of more than one generation time are important related to it.
Question 7
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Increased IMR and decreased MMR in a population will

A
Cause rapid increase in growth rate

B
Result in decline in growth rate

C
Not cause significant change in growth rate

D
Result in an explosive population
Solution
- IMR (Infant Mortality Rate) is the number of deaths per 1000 live births, which are under 1 year of age.
- MMR (Maternal Mortality Rate) is the number of maternal deaths per 100000 live births.
Hence, if IMR will increase then population growth rate will decline and if MMR will decrease then population growth will increase.
So, if IMR increases and MMR decreases then, overall growth rate of the population will decline as IMR is per 1000 live births and MMR is per 100000 live births.
So, the correct answer is 'Result in decline in growth rate'.
Question 8
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Which of the following statements is false regarding predators?

A
Predators keep prey populations under control.

B
Predators help in maintaining species diversity in a community.

C
If a predator is not efficient, then the prey population would become extinct.

D
Herbivores have a greater advantage over carnivores since the plants cannot run away to avoid predation.

Solution

If a predator is too efficient, then the prey population would become extinct, and following it, the predator will also become extinct due to the lack of food that is the reason prey species have to evolve various mechanisms to protect themselves so that the balance is maintained.
So the correct option is option C.
Question 9
1 / -0

When organisms change their location to escape from harsh environment, it is called as

A
Hibernation

B
Vernalisation

C
Migration

D
Aestivation

Solution

The seasonal movement of complete populations of animals to a more favorable is called migration It is usually in response to uneven precipitation and lower temperatures resulting in a reduced food supply and is often triggered by a change in day length. Migration is common in mammals. (e.g. porpoises), fish (e.g. eels and salmon) and some insects but is most marked in birds.
So, the correct answer is 'migration'
Question 10
1 / -0

Which of the following statement is correct with regard to Bergmann's rule?

A
Animals of colder area have large size than of hot areas

B
Fish of colder areas have large size

C
Birds colder areas have narrow wings

D
Animals of colder areas possess thick fur

Solution

Animals of cold areas possess thick coat of hair, scales, feathers and subcutaneous fat (Gloger's rule). Warm blooded animals (birds, mammals) of colder areas are of larger size as compared to those of warmer areas (Bergmann's rule). Extremities of mammals (ears,snout, tail, legs) of colder areas are shorter than those of warmer regions (Allen''s rule). Birds have narrow wings in cold areas as compared to those of warmer regions (Ransch's rule). Fish of colder waters tend to have more vertebrae (Jordan's rule).
So, the correct answer is 'Animals of colder area have large size than of hot areas'.

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Organisms and Populations Test - 61

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Organisms and Populations Test - 61

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SHARING IS CARING

Question 1

temperature

food availability

precipitation

All of these

Solution

Question 2

ectoparasite

endoparasite

epiphyte

hydrophyte

Solution

Question 3

parasitism

amensalism

commensalism

competition.

Solution

Question 4

(i), (ii) and (iii)

(ii), (iii) and (v)

(i), (ii) and (iv)

(i), (ii), (iii) and (v)

Solution

Question 5

$$A-(i), B-(v), C-(iv), D-(iii), E-(ii)$$

$$A-(ii), B-(i), C-(v), D-(iv), E-(iii)$$

$$A-(iii), B-(ii), C-(i), D-(v), E-(iv)$$

$$A-(v), B-(iv), C-(i), D-(ii), E-(iii)$$

Solution

Question 6

fecundity (birth rate)

generation time

death rate

All of these

Solution

Question 7

Cause rapid increase in growth rate

Result in decline in growth rate

Not cause significant change in growth rate

Result in an explosive population

Solution

Question 8

Predators keep prey populations under control.

Predators help in maintaining species diversity in a community.

If a predator is not efficient, then the prey population would become extinct.

Herbivores have a greater advantage over carnivores since the plants cannot run away to avoid predation.

Solution

Question 9

Hibernation

Vernalisation

Migration

Aestivation

Solution

Question 10

Animals of colder area have large size than of hot areas

Fish of colder areas have large size

Birds colder areas have narrow wings

Animals of colder areas possess thick fur

Solution

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