CLEARING

Question 1

What is the main purpose of clearing in histology?
A. To stain the tissue
B. To dehydrate the tissue
C. To remove the dehydrating agent and replace it with a solvent
D. To infiltrate the tissue with paraffin

Answer 1

C

Question 2

Which of the following is NOT a clearing agent?
A. Xylene
B. Glycerin
C. Toluene
D. Chloroform

Answer 2

B

Question 3

Which of the following acts only as a dealcoholizing agent but not a clearing agent?
A. Glycerin
B. Chloroform
C. Xylene
D. Terpineol

Answer 3

B

Question 4

Which of the following is used for both clearing in embedding and clearing in mounting?
A. Xylene
B. Chloroform
C. Brun’s solution
D. Carbon Tetrachloride

Answer 4

A

Question 5

Which clearing agent is recommended for delicate tissues like nervous tissue and lymph nodes?
A. Xylene
B. Benzene
C. Chloroform
D. Cedarwood oi

Answer 5

C CHLOROFORM

Question 5

Which of the following is NOT suitable for use in clearing before mounting?
A. Xylene
B. Terpineol
C. Carbol-xylene
D. Chloroform

Answer 5

D CHLOROFORM

Question 6

Which clearing agent can turn milky when dehydration is incomplete?
A. Xylene
B. Benzene
C. Toluene
D. Cedarwood oil

Answer 6

XYLENE

Question 6

Which of the following causes aplastic anemia upon excessive exposure?
A. Xylene
B. Benzene
C. Chloroform
D. Cedarwood oil

Answer 6

BENZENE

Question 7

Which clearing agent is commonly used for CNS, smooth muscles, and skin?
A. Xylene
B. Cedarwood oil
C. Chloroform
D. Benzene

Answer 7

CEDARWOOD OIL

Question 8

Which of the following is used to clear tissues embedded in celloidin?
A. Xylene
B. Benzene
C. Cedarwood oil
D. Terpineol

Answer 8

CEDARWOOD OIL

Question 9

Which clearing agent is recommended for large specimens and tough tissues?
A. Chloroform
B. Xylene
C. Benzene
D. Cedarwood oil

Answer 9

CHLOROFORM

Question 10

Which clearing agent can emit toxic fumes when concentrated solutions are used?
A. Xylene
B. Benzene
C. Toluene
D. Chloroform

Answer 10

TOLUENE

Question 11

What is the typical boiling point’s role in the clearing process?
A. It affects the rate of tissue transparency
B. It determines the solubility of paraffin
C. Low boiling point agents are replaced quickly by paraffin
D. It prevents the tissue from hardening

Answer 11

C. Low boiling point agents are replaced quickly by paraffin

Question 12

Which clearing agent is most suitable for clearing delicate tissues like embryos and insects?
A. Aniline oil
B. Xylene
C. Benzene
D. Cedarwood oil

Answer 12

ANILINE OIL

Question 13

Which clearing agent is known to clear slowly and may cause aniline dye removal?
A. Xylene
B. Clove oil
C. Benzene
D. Cedarwood oil

Answer 13

CLOVE OIL

Question 14

Which agent is a substitute for cedarwood oil and acts slowly due to high viscosity?
A. Terpineol
B. Xylene
C. Benzene
D. Chloroform

Answer 14

TERPINEOL

Question 15

What should be done to cedarwood oil before use if it has turned milky?
A. It should be heated
B. It should be discarded
C. It should be filtered
D. It should be mixed with xylene

Answer 15

It should be filtered

Question 16

Which clearing agent is commonly used for routine purposes and doesn’t cause excessive hardening?
A. Toluene
B. Benzene
C. Chloroform
D. Cedarwood oil

Answer 16

TOLUENE

Question 17

Which of the following is a disadvantage of using benzene as a clearing agent?
A. It is extremely slow
B. It is carcinogenic
C. It turns milky upon storage
D. It is not miscible with paraffin

Answer 17

CARCINOGENIC

Question 18

Which clearing agent is derived from essential oils and is found in citrus peels?
A. Xylene
B. Terpenes
C. Cedarwood oil
D. Aniline oil

Answer 18

TERPENES

Question 19

Which clearing agent can cause tissues to float, requiring the use of absorbent cotton gauze?
A. Xylene
B. Chloroform
C. Benzene
D. Cedarwood oil

Answer 19

CHLOROFORM

Question 20

Which clearing agent is known to cause slow penetration due to high viscosity?
A. Xylene
B. Benzene
C. Cedarwood oil
D. Toluene

Answer 20

BENZENE

Question 21

Which clearing agent can be used in both embedding and mounting procedures but is slower than xylene and benzene?

a) Toluene
b) Chloroform
c) Cedarwood oil
d) Xylene

Answer 21

TOLUENE

Question 22

Which clearing agent must be followed by immersion in xylene or benzene to remove oil from tissues?

a) Chloroform
b) Toluene
c) Cedarwood oil
d) Benzene

Answer 22

CEDARWOOD OIL

Question 23

Which clearing agent is known for being toxic to the liver on prolonged inhalation?

a) Benzene
b) Xylene
c) Chloroform
d) Toluene

Answer 23

CHLOROFORM

Question 24

Which clearing agent turns milky if dehydration is not complete and is used in both embedding and mounting?

a) Xylene
b) Toluene
c) Benzene
d) Cedarwood oil

Answer 24

XYLENE