Biology Test 366

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Biology Test 366

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Weekly Quiz Competition

Question 1
4 / -1

By chemical nature, hormones are never :

A
steroids

B
amino acid derivatives

C
proteins

D
monosaccharide derivatives

Solution

Hormones are generally proteincomponents having amino acids as well as steroids. Hormones are generally not monosaccharide derivatives in nature
Question 2
4 / -1

What is 'resource partitioning' and how does it help species co-exist?

A
It refers to species dividing resources like food or space to reduce competition.

B
It is a process where one species eliminates another due to competitive superiority.

C
It enables species to share the same habitat without harm.

D
It allows species to access the same resource in the exact same way and at the same time.

Solution

Resource partitioning is a strategy where species share the same resources but divide them in a way that reduces competition, allowing them to coexist. This can be through spatial or temporal division of resources.It allows species to access the same resource at different times or in different ways.
Question 3
4 / -1

Role of thymus in homo sepiens is chiefly concerned with :-

A
Reproduction

B
Immunology

C
Calcium balance

D
Blood coagulation

Solution

The correct answer is B: Immunology.

- The thymus is a crucial organ in the immune system of humans.

- It is primarily responsible for the maturation and differentiation of T-lymphocytes or T cells, which are essential for the immune response.

- T cells play a critical role in recognizing and attacking pathogens such as bacteria, viruses, and other harmful substances in the body.

- The thymus helps in training T cells to distinguish between self and non-self antigens, thus preventing autoimmune reactions.

- Overall, the thymus is vital for the development and regulation of the body's immune responses.
Question 4
4 / -1

Primary succession occurs on

A
area destroyed due to forest fire

B
newly formed river delta

C
harvested crop field

D
all of these

Solution

Primary succession starts from the primitive substratum, where previously there was not any sort of living matter. The first groups of plants establishing there are known as the pioneers, primary community or primary colonisers. Newly formed river delta, newly exposed sea floor, igneous rocks, sand dunes, new cooled lava sediments are some examples of primary bare area. Primary succession takes a long time for completion, several hundred to several thousand years.
Question 5
4 / -1

Darwin judged the fitness of an individual by

A
Dominance over other individual

B
Strategy to obtain food

C
Ability to defend itself

D
Number of offspring

Solution

Darwin judged the fitness of an individual by number of offspring the individual produce in particular niche. More the viable offspring formed the more fit the organism in that surrounding.
Question 6
4 / -1

Match List I with List II.

Choose the correct answer from the options given below.

A
A-I, B-II, C-III, D-IV

B
A-I, B-II, C-IV, D-III

C
A-III, B-IV, C-I, D-II

D
A-II, B-III, C-I, D-IV

Solution

A leopard and a lion in a forest/grassland (A) : These two species are predators that hunt in the same environment and likely compete for the same prey. This is an example of competition (I).

A cuckoo laying an egg in a crow's nest (B) : The cuckoo is known for laying its eggs in the nests of other birds, such as crows. The crow then raises the cuckoo's young, often at the expense of its own offspring. This is a form of brood parasitism (II).

Fungi and the root of a higher plant in mycorrhizae (C) : Mycorrhizae are symbiotic relationships between fungi and plant roots, in which the fungi help the plant absorb water and nutrients from the soil, while the plant provides the fungi with carbohydrates. This is an example of mutualism (III).

A cattle egret and a cattle in a field (D) : Cattle egrets are often seen near cattle, feeding on the insects that the cattle stir up as they move and graze. The egret benefits from this interaction (by getting easy access to food), while the cattle are unaffected. This is an example of commensalism (IV).

Given this information, the correct match is :

Option A : A-I, B-II, C-III, D-IV
Question 7
4 / -1

In a life table, the number of individuals alive at the beginning of the 1 st year to 2 nd year interval is 800. During this interval, 200 individuals die. The death rate for this interval is

A
0.25

B
200

C
800

D
0.2

Solution
Question 8
4 / -1

Assertion: The somatic nervous system regulates involuntary functions of the body.

Reason: The somatic nervous system is divided into the sympathetic and parasympathetic systems.

A
Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.

B
Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

C
Assertion is correct, but Reason is incorrect.

D
Both Assertion and Reason are incorrect.

Solution

Correct option: D

The somatic nervous system primarily controls voluntary movements by transmitting motor commands to skeletal muscles and carrying sensory information to the central nervous system.

Functions that are involuntary (for example, heart rate, digestion, breathing rhythm and glandular secretion) are regulated by the autonomic nervous system, not the somatic system.

The autonomic nervous system is divided into the sympathetic and parasympathetic divisions, which generally produce opposing effects on target organs to maintain physiological balance.

Hence, the Assertion is incorrect and the Reason is also incorrect; both statements are false.
Question 9
4 / -1

Match the following:

Hormone:

a) Parathormone

b) Oxytocin

c) Sex hormone

d) Norepinephrine

Nature:

i) polypeptide

ii) amino acid derivative

iii) peptide

iv) steroid

Choose the correct matching.

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

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

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

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

Solution

Correct answer: A.

Parathormone (PTH) is an 84-amino-acid polypeptide secreted by the parathyroid glands; it is therefore classified as a polypeptide.

Oxytocin is a peptide hormone (a nonapeptide) produced by the posterior pituitary; it is correctly classified as a peptide.

Sex hormones such as testosterone, oestrogen and progesterone are derived from cholesterol and are classified as steroid hormones.

Norepinephrine (noradrenaline) is a catecholamine formed from the amino acid tyrosine and is therefore an amino acid derivative.

Thus the correct matching is: a)-i, b)-iii, c)-iv, d)-ii (option A).
Question 10
4 / -1

About 70% of total global carbon is found in

A
oceans

B
forests

C
grasslands

D
agroecosystems

Solution

The cycling pool of carbon consists of 6 x 10¹⁴ kg (29%) of free CO₂ in the atmosphere, 1.45 x 10¹⁵ kg (71%) of dissolved CO₂ occurs in the oceans. Oceans also regulate the amount of CO₂ in the atmosphere.

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Biology Test 366

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Question 1

steroids

amino acid derivatives

proteins

monosaccharide derivatives

Solution

Question 2

It refers to species dividing resources like food or space to reduce competition.

It is a process where one species eliminates another due to competitive superiority.

It enables species to share the same habitat without harm.

It allows species to access the same resource in the exact same way and at the same time.

Solution

Question 3

Reproduction

Immunology

Calcium balance

Blood coagulation

Solution

Question 4

area destroyed due to forest fire

newly formed river delta

harvested crop field

all of these

Solution

Question 5

Dominance over other individual

Strategy to obtain food

Ability to defend itself

Number of offspring

Solution

Question 6

A-I, B-II, C-III, D-IV

A-I, B-II, C-IV, D-III

A-III, B-IV, C-I, D-II

A-II, B-III, C-I, D-IV

Solution

Question 7

0.25

200

800

0.2

Solution

Question 8

Both Assertion and Reason are correct, and Reason is the correct explanation of Assertion.

Both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

Assertion is correct, but Reason is incorrect.

Both Assertion and Reason are incorrect.

Solution

Question 9

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

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

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

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

Solution

Question 10

oceans

forests

grasslands

agroecosystems

Solution

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