Mix Test

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Mix Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Double fertilisation refers to the fusion of

A
two polar nuclei

B
secondary nucleus with male gamete

C
two eggs

D
one male gamete with an egg and another with 2 polar nuclei

Solution

Double fertilisation refers to the fusion of one male gamete with an egg and another with 2 polar nuclei. The two central cell maternal nuclei (polar nuclei) that contribute to the endosperm arise by mitosis from the same single meiotic product that gave rise to the egg. The maternal contribution to the genetic constitution of the triploid endosperm is double that of the embryo.
Question 2
1 / -0

Which of the following is not included in the five kingdom classification of R. H. Whittaker?

A
Monera

B
Virus

C
Fungi

D
Protista

Solution

In the five kingdom classification of Whittaker, there is no mention of acellular organisms like viruses. Along with viruses, viroids as well as the lichens are not included in the five kingdom system of classification.
Question 3
1 / -0

If due to some injury, the chordae tendineae of the tricuspid valve of the human heart are partially non-functional, then what will be the immediate effect?

A
The pacemaker will stop working.

B
The blood will tend to flow into the left atrium.

C
The flow of blood into the pulmonary artery will be reduced.

D
The flow of blood into the aorta will be slowed down.

Solution

Strong, thread-like tendons, called chordae tendineae, arise from papillary muscles and insert upon the flaps of tricuspid and bicuspid valves. The valves in the heart allow the flow of blood only in one direction, i.e. from the atria to the ventricles and from the ventricles to the pulmonary artery or aorta. If chordae tendineae of the tricuspid valve(located between the right atrium and right ventricle) became partially non-functional due to injury, then the flow of blood into the pulmonary artery will be reduced.
Question 4
1 / -0

While using a stethoscope, a physician hears a sound of 'LUBB'. Which activity is responsible for producing this sound?

A
Opening of mitral and tricuspid valves

B
Closing of mitral and tricuspid valves

C
Closing of aortic semilunar valves

D
Opening of pulmonary semilunar valves

Solution

The first sound 'LUBB' is produced when the 'atrio-ventricular' valves get closed sharply at the start of ventricular systole.
Question 5
1 / -0

Which of the following types of adventitious root modifications is found in Ipomoea batatas (sweet potato)?

A
Tuberous roots

B
Fasciculated roots

C
Nodulose roots

D
Moniliform roots

Solution

Tuberous root is a thick and fleshy root, like a tuber but without buds. Examples of plants with notable tuberous roots include the sweet potato, cassava, and dahlia.
Question 6
1 / -0

If mammalian ovum fails to get fertilised, then which of the following is unlikely to happen?

A
Corpus luteum will disintegrate.

B
Progesterone secretion will rapidly decline.

C
Oestrogen secretion will further decrease.

D
Primary follicle will start developing.

Solution

Formation of primary follicles is the second stage of folliculogenesis. Primary follicles are formed before birth.
Question 7
1 / -0

The vascular bundles of a monocot stem are

A
collateral and closed

B
collateral and open

C
radially arranged and open

D
radially arranged and closed

Solution

The vascular bundles of a monocot stem are collateral and closed. A collateral bundle is a vascular bundle in which the phloem and xylem lie on the same radius, with the phloem located towards the periphery of the stem and the xylem towards the centre, and the 'closed' bundles of monocots lack cambium.
Question 8
1 / -0

The type of gene mutation in which a purine gets replaced by a pyrimidine and vice-versa is called

A
transduction

B
translation

C
inversion

D
transversion

Solution

Transversion refers to a point mutation in deoxyribonucleic acid, where a single purine is changed for a pyrimidine, or vice versa. A transversion can be spontaneous, or can be caused by ionizing radiation or alkylating agents. It can only be reversed by a spontaneous reversion.
Question 9
1 / -0

In public urinals, the urine gives a pungent smell due to

A
the conversion of both urea and uric acid into ammonia

B
the conversion of uric acid into ammonia by ornithine cycle

C
the conversion of urea into ammonia by bacteria

D
None of these

Solution

In public urinals, the urine gives a pungent smell due to the conversion of urea into ammonia by bacteria.
Question 10
1 / -0

Wings of mosquitoes, bats and birds show ________ evolution.

A
divergent

B
convergent

C
parallel

D
micro

Solution

Wings of mosquitoes, bats and birds show convergent evolution. Convergent evolution is the independent evolution of similar features in species of different lineages.
Question 11
1 / -0

Which of the following muscles is unable to undergo a sustained contraction?

A
Skeletal muscle

B
Visceral muscle

C
Cardiac muscle

D
None of these

Solution

Skeletal muscle is unable to undergo a sustained contraction as it would lead to tetanus state of muscles.
Question 12
1 / -0

Which of the following characters is not typical of the class Mammalia?

A
Alveloar lungs

B
Ten pairs of cranial nerves

C
Seven cervical vertebrae

D
Thecodont dentition

Solution

There are 12 pairs of cranial nerves in the class Mammalia. Cranial nerves arise directly from the brain and supply the special sensory organs and general senses from the head and neck.
Question 13
1 / -0

Which of the following pairs is characterised by swollen lips, thick pigmented skin of hands and legs and irritability?

A
Iodine - Goitre

B
Protein - Kwashiorkor

C
Thiamine - Beri-beri

D
Nicotinamide - Pellagra

Solution

Pellagra is a disease caused by the deficiency of nicotinamide or nicotinic acid or niacin or vitamin B₃.It is common among people eating food with low tryptophan content.
Question 14
1 / -0

In the given diagram of the human heart, label the parts A, B, C and D.

A
A - pulmonary artery, B - pulmonary vein, C - aorta and D - right ventricle

B
A - pulmonary artery, B - pulmonary vein, C - left ventricle and D - aorta

C
A - pulmonary vein, B - left ventricle, C - aorta and D - pulmonary artery

D
A - aorta, B - pulmonary vein, C - right ventricle and D - pulmonary artery

Solution

A is a pulmonary vein, B is the left ventricle, C is aorta and D is a pulmonary artery.
Question 15
1 / -0

In crucifers, whiptail disease is caused due to the deficiency of

A
manganese

B
magnesium

C
molybdenum

D
iron

Solution

Whiptail disorder is caused due to the deficiency of molybdenum. In young plants, the deficiency symptoms are chlorosis of leaf margins and the whole leaves may turn white. The leaf blades do not develop properly. When the deficiency is severe, only the midribs develop.

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Mix Test - 5

Result

Mix Test - 5

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SHARING IS CARING

Question 1

two polar nuclei

secondary nucleus with male gamete

two eggs

one male gamete with an egg and another with 2 polar nuclei

Solution

Question 2

Monera

Virus

Fungi

Protista

Solution

Question 3

The pacemaker will stop working.

The blood will tend to flow into the left atrium.

The flow of blood into the pulmonary artery will be reduced.

The flow of blood into the aorta will be slowed down.

Solution

Question 4

Opening of mitral and tricuspid valves

Closing of mitral and tricuspid valves

Closing of aortic semilunar valves

Opening of pulmonary semilunar valves

Solution

Question 5

Tuberous roots

Fasciculated roots

Nodulose roots

Moniliform roots

Solution

Question 6

Corpus luteum will disintegrate.

Progesterone secretion will rapidly decline.

Oestrogen secretion will further decrease.

Primary follicle will start developing.

Solution

Question 7

collateral and closed

collateral and open

radially arranged and open

radially arranged and closed

Solution

Question 8

transduction

translation

inversion

transversion

Solution

Question 9

the conversion of both urea and uric acid into ammonia

the conversion of uric acid into ammonia by ornithine cycle

the conversion of urea into ammonia by bacteria

None of these

Solution

Question 10

divergent

convergent

parallel

micro

Solution

Question 11

Skeletal muscle

Visceral muscle

Cardiac muscle

None of these

Solution

Question 12

Alveloar lungs

Ten pairs of cranial nerves

Seven cervical vertebrae

Thecodont dentition

Solution