Zoology - Online Test
Q1.
Answer : Option B
Explaination / Solution:
An amylase is an enzyme that catalyses the hydrolysis of starch into sugars. Amylase is present in the saliva of humans and some other mammals, where it begins the chemical process of digestion. it is a major digestive enzyme, and its optimum pH is 6.8
Q2. A tumor enclosed within a capsule is termed
Answer : Option B
Explaination / Solution:
A tumor enclosed within a capsule is called benign tumor. Benign tumors normally remain confined to their original location and do not spread to other parts of the body and cause little damage.
Q3. Blood vessels are found to be present in which region of eye?
Answer : Option D
Explaination / Solution:
The middle layer, choroid contains many blood vessels and looks bluish in colour.
Q4. Lysosomes are produced by
Answer : Option D
Explaination / Solution:
Lysosomes are manufactured and budded into the cytoplasm by the Golgi apparatus with enzymes inside.
The enzymes that are within the lysosome are made in the rough endoplasmic reticulum, which are then delivered to the Golgi apparatus via transport vesicles.
Q5. The code AUG stands for
Answer : Option B
Explaination / Solution:
The start codon is the first codon of a messenger RNA (mRNA) transcript translated by a ribosome. The start codon always codes for methionine in eukaryotes and a modified Met (fMet) in prokaryotes. The most common start codon is AUG.
Q6. The principle of exchange of gases at the lungs is :
Answer : Option A
Explaination / Solution:
The main function of the respiratory system is gaseous exchange. This refers to the process of Oxygen and Carbon Dioxide moving between the lungs and blood. Diffusion occurs when molecules move from an area of high concentration (of that molecule) to an area of low concentration. This occurs during gaseous exchange as the blood in the capillaries surrounding the alveoli has a lower oxygen concentration of Oxygen than the air in the alveoli which has just been inhaled.
Q7. Hybrid vigour is mostly due to
Answer : Option C
Explaination / Solution:
Hybrid vigour is mostly due to heterozygosity of traits. The hybrid contain genome from both the parents that make them more vigorous.
Q8. Wild animals :
i) Frequently breed in Zoos.
ii) Reproductive capacity is lowered if area of free movement is reduced.
i) Frequently breed in Zoos.
ii) Reproductive capacity is lowered if area of free movement is reduced.
Answer : Option D
Explaination / Solution:
Reproductive capacity of an animals is lowered if area of free movement is reduced. So, wild animals do not breed frequently in Zoos. So, statement i is wrong and ii is correct.
Q9.
Match the following :
| Column A | Column B |
| a) PTH | i) Mineralocorticoid |
| b) Cortisol | ii) Inhibiting hormone |
| c) Aldosterone | iii)Collip’s hormone |
| d) Somatostatin | iv) Glucocorticoid |
Answer : Option C
Explaination / Solution:
pituitary thyroid hormone is also called as collip’s hormone. Cortisol is called as glucocorticoid hormone. Aldosterone is called as mineralocorticoid and somatostatin is called as inhibiting hormone.
Q10. Which phylum has water vascular system as a characteristic feature?
Answer : Option C
Explaination / Solution:
The most distinctive feature of Echinodermata is the presence of water vascular system.
