Mix Test

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Mix Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

The structure 'typhlosole' in earthworms is used for

A
crushing food

B
slowing down the passage of food

C
increasing the absorptive area

D
extra secretion of digestive enzymes

Solution

The structure 'typhlosole' in earthworms is used for increasing the absorptive surface area, which increases the rate of nutrient absorption. It runs mid-dorsally from 27^th to last 25^th segment.
Question 2
1 / -0

Miller synthesised simple amino acids form water vapours and mixtures containing

A
H₂, O₂, N₂ (1 : 2 : 1)

B
H₂, O₂, N₂ (2 : 1 : 2)

C
CH₄, NH₃, H₂ (2 : 1 : 2)

D
CH₄, NH₃, H₂ (1 : 2 : 1)

Solution

The correct option is 4.
Question 3
1 / -0

The shape of the chromosome is determined by

A
centromere

B
telomere

C
centrosphere

D
chromomere

Solution

The centromere is the specialized DNA sequence of a chromosome that links a pair of sister chromatids (a dyad). During mitosis, spindle fibers attach to the centromere via the kinetochore. The arms of chromosomes can be connected together with the help of centromere, in either metacentric, submetacentric, acrocentric or telocentric manner.
Question 4
1 / -0

In a split brain surgery in an epileptic patient, the commissure that allows communication between the two hemispheres is cut. This nerve tract is

A
corpus callosum

B
fornix

C
hippocampus gyrus

D
fissure of Rolando

Solution

The corpus callosum also callosal commissure, is a wide, thick, nerve tract consisting of a flat bundle of commissural fibers, beneath the cerebral cortex in the brain. The corpus callosum is only found in placental mammals. It facilitates communication between the two hemispheres.
Question 5
1 / -0

Which of the following diseases is related to changes and damage within the inner ear causing a sense of fullness or pressure inside the ear?

A
Conn's syndrome

B
Simmond's syndrome

C
Meniere's syndrome

D
Sea sickness

Solution

Meniere's syndrome is an inner ear disease that typically affects one ear. This disease can cause pressure or pain in the ear, severe cases of dizziness or vertigo, hearing loss and a ringing or roaring noise, also known as tinnitus.

Question 6

1 / -0

Match the following:

Column I	Column II
A. Renal calculi	i. Inflammation of mucosa and submucosa of the urinary bladder
B. Pyelonephritis	ii. Glomerular inflammation due to allergy of bacterial toxins
C. Cystitis	iii. Kidney stones usually obstructing urinary tract
D. Bright's disease	iv. Inflammation of one or both kidneys involving nephrons and pelvis

A - iv, B - iii, C - ii, D - i

A - iii, B - iv, C - ii, D - i

A - iii, B - i, C - iv, D - ii

A - iii, B - iv, C - i, D - ii

Solution

Renal calculi refer to kidney stones that usually obstruct the urinary tract. The renal calculi are solid masses made of crystals which usually originate in the kidneys. However, they can develop anywhere along the urinary tract.
Pyelonephritis is inflammation of the kidney, typically due to a bacterial infection. Symptoms most often include fever and flank tenderness.
Cystitis is characterised by inflammation of mucosa and submucosa of the urinary bladder. Cystitis is usually caused by a bacterial infection.
A symptom of Bright's disease is glomerular inflammation due to allergy of bacterial toxins. It is characterised by swelling and the presence of albumin in the urine, and is frequently accompanied by high blood pressure and heart disease.

Question 7
1 / -0

Which of the following types of root modifications is found in radish?

A
Fusiform

B
Conical

C
Napiform

D
Tuberous

Solution

Fusiform root modification is seen in radish. In this modification, the primary root is swollen in the middle while both the ends gradually taper forming a spindle-shaped structure.
Question 8
1 / -0

Foramen of magendie is found in

A
medulla oblongata

B
cerebral cortex

C
corpus striatum

D
neuropallium

Solution

Foramen of magendie is found in medulla oblongata. It drains cerebrospinal fluid (CSF) from the fourth ventricle into the cisterna magna.
Question 9
1 / -0

Which of the following structures will not be visible in the section of a hyaline cartilage?

A
Perichondrium

B
Chondroblast

C
Lacuna

D
Haversian canal

Solution

Haversian canals are a series of microscopic channels in the outermost region of bone called cortical bone that allow blood vessels and nerves to travel through them. Each haversian canal generally contains one or two capillaries and nerve fibres.

Question 10

1 / -0

Match the following:

Column I	Column II
A. Greenstick fracture	i. Haematoma not exposed
B. Closed fracture	ii. Occurs more commonly in children
C. Open fracture	iii. Hyper-parathyroidism as one of the reasons
D. Pathologic fracture	iv. Compound fracture associated with exposed haematoma

A - ii, B - i, C - iv, D - iii

A - iii, B - iv, C - ii, D - i

A - iii, B - iv, C - i, D - ii

A - ii, B - iv, C - i, D - iii

Solution

A greenstick fracture is a fracture in a young, soft bone in which the bone bends and breaks. Greenstick fractures usually occur most often during infancy and childhood when bones are soft.
A closed fracture is a fracture in which the broken bone does not penetrate the skin. In a closed fracture, the haematoma (blood clot) does not expose.
An open fracture is a compound fracture associated with an exposed haematoma (blood clot). It is a fracture in which there is an open wound or break in the skin near the site of the broken bone.
A pathologic fracture (also called insufficiency fracture) is a bone fracture caused by weakness of the bone structure that leads to decreased mechanical resistance to normal mechanical loads. Hyper-parathyroidism is one of the most common causes of a pathologic fracture.

Question 11
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 12
1 / -0

The part of fallopian tube closest to the ovary is

A
infundibulum

B
cervix

C
ampulla

D
isthmus

Solution

The part of fallopian tube closest to the ovary is infundibulum. Infundibulum possess finger-like projections called fimbriae that help in collection of ovum after ovulation. It leads to wider part of oviduct called ampulla. The last part of oviduct is isthmus that has a narrow lumen and joins the uterus.
Question 13
1 / -0

Carbon monoxide inhibits mitochondrial electron transport by

A
inhibiting the electron transfer of complex I

B
binding to the oxygen-binding site of cytochrome oxidase

C
blocking electron transport at the level of the cytochrome b-c complex

D
binding to haemoglobin in the erythrocytes and therefore, blocking the transport of oxygen to tissues

Solution

Carbon monoxide is toxic for mitochondria in man, altering the mitochondrial respiratory chain at the cytochrome c oxidase level. This inhibition in cytochrome c oxidase may play a role in the development of the symptoms observed in acute CO poisoning, and in some diseases related to smoking.
Question 14
1 / -0

Which of the following is the correct set of vestigial organs?

A
Ileo-caecal valve of man, wings of birds and caudal fins of fish

B
Patygium of bats, scales of snakes and carapace of turtles

C
Nails of man, premolar of man and ileum of all vertebrates

D
Wings of kiwi, splint bone of horse and hind limbs of python

Solution

Vestigiality is the retention during the process of sexual reproduction of genetically determined structures or attributes that have lost some or all of their ancestral function in a given species. Some of the vestigial organs in humans are: muscles of the ear; wisdom teeth; the appendix; the tail bone; body hair; and the semilunar fold. Some examples of vestigial organs in other animals are: wings of kiwi, splint bone of horse and hind limbs of python.
Question 15
1 / -0

The development of sterility in mules is because of

A
postmating isolating mechanism

B
premating isolating mechanism

C
natural selection

D
None of these

Solution

The development of sterility in mules is because of postmating isolating mechanism. Postmating isolating mechanisms are those mechanisms that prevent hybrid offspring from developing or breeding even if reproduction attempts have been successful. Cross between a horse and a donkey produces a mule which is usually sterile. In some cases mules are fertile, but the F₂ generation is not.

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Re-Attempt Weekly Quiz Competition

Mix Test - 10

Result

Mix Test - 10

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SHARING IS CARING

Question 1

crushing food

slowing down the passage of food

increasing the absorptive area

extra secretion of digestive enzymes

Solution

Question 2

H2, O2, N2 (1 : 2 : 1)

H2, O2, N2 (2 : 1 : 2)

CH4, NH3, H2 (2 : 1 : 2)

CH4, NH3, H2 (1 : 2 : 1)

Solution

Question 3

centromere

telomere

centrosphere

chromomere

Solution

Question 4

corpus callosum

fornix

hippocampus gyrus

fissure of Rolando

Solution

Question 5

Conn's syndrome

Simmond's syndrome

Meniere's syndrome

Sea sickness

Solution

Question 6

A - iv, B - iii, C - ii, D - i

A - iii, B - iv, C - ii, D - i

A - iii, B - i, C - iv, D - ii

A - iii, B - iv, C - i, D - ii

Solution

Question 7

Fusiform

Conical

Napiform

Tuberous

Solution

Question 8

medulla oblongata

cerebral cortex

corpus striatum

neuropallium

Solution

Question 9

Perichondrium

Chondroblast

Lacuna

Haversian canal

Solution

Question 10

A - ii, B - i, C - iv, D - iii

A - iii, B - iv, C - ii, D - i

A - iii, B - iv, C - i, D - ii

A - ii, B - iv, C - i, D - iii

Solution

Question 11

Corpus luteum will disintegrate.

Progesterone secretion will rapidly decline.

Oestrogen secretion will further decrease.

Primary follicle will start developing.

Solution

Question 12

infundibulum

cervix

ampulla

isthmus

Solution

H₂, O₂, N₂ (1 : 2 : 1)

H₂, O₂, N₂ (2 : 1 : 2)

CH₄, NH₃, H₂ (2 : 1 : 2)

CH₄, NH₃, H₂ (1 : 2 : 1)