Zoology - Online Test
Q1. Which is a mismatched pair :
Answer : Option C
Explaination / Solution:
The abnormal frequency of bowel movement and increased liquidity of the faecal discharge is known as diarrhoea.
Q2. If you suspect deficiency of antibodies in a person, to which of the following would you look for confirmatory evidence?
Answer : Option A
Explaination / Solution:
One group of gamma globulins is the immunoglobulins, which are also known as antibodies. The serum globulin electrophoresis test measures the levels of proteins called globulins in the fluid part of a blood sample. This fluid is called serum.
Q3. Which of the following statements with reference to cytoskeleton is not correct?
Answer : Option D
Explaination / Solution:
The cytoskeleton in a cell is involved in functions like mechanical support, motility, maintenance of the shape of the cell.
Q4. RNA polymerase is only capable of catalyzing the process of
Answer : Option B
Explaination / Solution:
During protein synthesis, elongation of peptide chain is catalyzed by the enzyme RNA polymerase. Elongation continuous until a non-sense or stop codon is reached.
Q5. Purity of seed is guaranteed by
Answer : Option D
Explaination / Solution:
National Seed Corporation is responsible for maintaining purity of seeds of crop plants. This organization checks the purity of gene from pathogens as well as harmful effect of the contents present in it.
Q6. Species are classified within a hierarchy reflecting:
Answer : Option D
Explaination / Solution:
Classification of organisms are done on the basis of evolutionary hierarchy that is older organisms are classified first and recently evolved species later on.
Q7. Girls blind from birth attain puberty earlier than normal due to :
Answer : Option D
Explaination / Solution:
Pineal gland releases Melatonin (a hormone) which is responsible for inhibiting Lutinising hormone and Folicle Stimulating Hormone that bring about puberty. Melatonin is secreated more in absence of light. In normal humans it is more released at night when it is released more. In blind girls, light is absorbed more at day whose effect continues at night. Hence, Melatonin is secreted less and LH and FSH are not inhibited more and puberty is experienced early.
Q8. What is the main excretory organ in insects?
Answer : Option B
Explaination / Solution:
The insects belong to phylum Arthropoda and hence, the excretory organ is Malphighian tubules.
Q9. What is the number of sperms released in vagina in single insemination?
Answer : Option B
Explaination / Solution:
In single insemination during coitus about 200-300 millions of sperms are released in the vagina of female. About 60% of them must have normal shape and size along with vigorous motility for fertilisation of ovum.
Q10. Length of DNA with 23 base pairs is
Answer : Option C
Explaination / Solution:
The distance between two base pairs in DNA is 3.4 . The length of DNA with 23 base pairs is 23x 3.4 = 78.2 .
