Biology Test 281

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Biology Test 281

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Weekly Quiz Competition

Question 1
4 / -1

The morphological nature of the edible part of coconut is

A
Perisperm

B
Cotyledon

C
Endosperm

D
Pericarp

Solution

Coconut has double endosperm with liquid endosperm and cellular endosperm.
Question 2
4 / -1

Root hairs develop from the region of

A
Maturation

B
Elongation

C
Root cap

D
Meristematic activity

Solution

In roots, the root hairs arise from zone of maturation. This zone is differentiated zone thus bearing root hairs.
Question 3
4 / -1

Coconut fruit is a

A
Drupe

B
Berry

C
Nut

D
Capsule

Solution

Coconut fruit is a drupe. A drupe develops from monocarpellary superior ovary and are one seeded.
Question 4
4 / -1

When the margins of sepals or petals overlap one another without any particular direction, the condition is termed as:

A
Vexillary

B
Imbricate

C
Twisted

D
Valvate

Solution

Imbricate aestivation – One internal, one external and others margin overlapping.
Question 5
4 / -1

An aggregate fruit is one which develops from

A
Multicarpellary apocarpous gynoecium

B
Multicarpellary syncarpous gynoecium

C
Complete inflorescence

D
Multicarpellary superior ovary

Solution

Aggregate fruit – Multicarpellary apocarpous gynoecium
Question 6
4 / -1

What does binomial nomenclature refer to?

A
The scientific naming of organisms using two names

B
A naming system with three components

C
The use of common names in scientific classification

D
Classification based on genetic information only

Solution

Answer: A. The scientific naming of organisms using two names

Solution: Binomial nomenclature refers to the scientific naming system for organisms that uses two names: the genus name and the specific epithet. This system, developed by Carl Linnaeus, ensures that each species has a unique, universally accepted scientific name. The genus name is capitalized, and the specific epithet is lowercase, both italicized when typed or underlined when handwritten. An interesting additional fact is that this naming system provides a standardized way to identify organisms worldwide, facilitating communication and research across different languages and regions.
Question 7
4 / -1

What is the nature of blood passing through blood vessels A, B, C and D respectively?

A
A - Deoxygenated, B - Oxygenated, C - Deoxygenated, D - Oxygenated

B
A - Deoxygenated, B - Deoxygenated, C - Oxygenated, D - Oxygenated

C
A - Oxygenated, B - Oxygenated, C - Deoxygenated, D - Deoxygenated

D
A - Oxygenated, B - Deoxygenated, C - Oxygenated, D - Deoxygenated

Solution

'A' is vena cava that carries deoxygenated blood

'B' is aorta that carries oxygenated blood

'C' is pulmonary artery that carries deoxygenated blood

'D' is pulmonary vein that carries oxygenated blood.
Question 8
4 / -1

Which of the following sequences is truly a systemic circulation pathway?

A
Right ventricle → Pulmonary aorta → Tissues → Pulmonary veins → Left auricle

B
Right auricle → Left ventricle → Aorta → Tissues → Veins → Right auricle

C
Left auricle → Left ventricle → Pulmonary aorta → Tissues → Right auricle

D
Left auricle → Left ventricle → Aorta → Arteries → Tissues → Veins → Right atrium

Solution

Systemic circulation is the movement of the blood between heart and rest of the body (tissues) and the back to the heart. The oxygenated blood moves from the left auricle into the left ventricle. From here the blood moves into the aorta which ultimately divides into arteries that carry oxygenated blood to various tissues in the body. From the tissues deoxygenated blood is carried by the veins into the right atrium via superior vena cava and inferior vena cava.
Question 9
4 / -1

Which of the following is the diagrammatic representation of standard electrocardiogram(ECG)?

A

B

C

D

Solution

A normal electrogram (ECG) is composed of a ‘P’ wave, a QRS wave (complex), and a T wave. The ‘P’ wave is a small upward wave that represents electrical excitation or atrial depolarization which leads to contraction of both the atria. QRS wave (complex) begins after a fraction of a second of the P wave. It begins as a small downward deflection (Q) and continues as a larger upright (R) and triangular wave, ending as a downward wave (S) at its base. It represents ventricular depolarization. The ‘T’ wave is dome-shaped which represents ventricular repolarization. The potential generated by the recovery of the ventricle from the depolarization state is called the repolarization wave. The end of the ‘T’ wave marks the end of the systole.
Question 10
4 / -1

What would be the cardiac output of a person having 72 heart beats per minute and a stroke volume of 50 ml?

A
360 ml

B
7200 ml

C
5000 ml

D
3600 ml

Solution

The cardiac output of a person having 72 heart beats per minute and a stroke volume of 50 mL would be 72 x 50 = 3600 mL. Thus, the correct answer is 3600 mL, i.e Option D.