Biology - Online Test
Q1. Following conversion in forward and backward directions is regulated as :
Blood calcium Bone calcium
Answer : Option C
Explaination / Solution:
Thyrocalcitonin (TCT) influence the metabolism of calcium inside the body. Parathyroid hormone (PTH) absorption of calcium in bone.
Q2. Air bladder is absent in
Answer : Option B
Explaination / Solution:
Air bladder is absent in chondrichthyes that help in floating in water.
Q3. The seminiferous tubules are lined by
Answer : Option B
Explaination / Solution:
Spermatogenesis occurs in the seminiferous tubules of the testes. The seminiferous tubules are lined by germinal epithelium which are made up of germ cells and sertoli cells.
Q4. In most fungi the structural polysaccharide of cell wall is ------
Answer : Option D
Explaination / Solution:
In most fungi the structural polysaccharide of cell wall is chitin. In plant cells cell wall is made up of cellulose.
Q5. Genes are
Answer : Option A
Explaination / Solution:
Genes are segment of DNA present on chromosome. Large numbers of genes are located on single chromosome. A gene or genes determines the traits of the individual.
Q6. Symbiotic association of fungi with plant are called as
Answer : Option C
Explaination / Solution:
Symbiotic association of fungi with angiosperm plant root is called mycorrhiza. Most of the plants have this kind of relation. The fungus obtains some sugar from the plant and plant get minerals and water absorbed by fungi.
Q7. Prothrombin plays crucial role in blood coagulation and vitamin K is considered essential for blood clotting, now read the following :
i. Vitamin K is necessary for synthesis of prothrombin in liver.
ii. Vitamin K is necessary for synthesis of prothrombin in bone marrow.
iii. Vitamin K is necessary for conversion of prothrombin into active thrombin.
i. Vitamin K is necessary for synthesis of prothrombin in liver.
ii. Vitamin K is necessary for synthesis of prothrombin in bone marrow.
iii. Vitamin K is necessary for conversion of prothrombin into active thrombin.
Answer : Option B
Explaination / Solution:
Prothrombin plays crucial role in blood coagulation and vitamin K is essential for blood clotting. Vitamin K is necessary for synthesis of prothrombin in liver.
Q8. In kreb cycle, isocitric acid is converted into α-keto glutaric acid by
Answer : Option D
Explaination / Solution:
Citrate is first isomerised to isocitrate and then followed by decarboxylation, leading to the formation of α-ketoglutaric acid.
Q9. Which of the following is not a radioactive isotope
Answer : Option B
Explaination / Solution:
Lead 207 Metal (Lead-207) is a stable (non-radioactive) isotope of Lead. It is both naturally occurring and a produced by fission.
Lead 207 Metal is one of over 250 stable Metallic isotopes produced by American Elements for biological and biomedical labeling, as target materials and other applications.
Lead Metal 207 additionally has special application in isotope dilution to measure lead levels in blood
Q10. Which stage is marked by terminalisation of chiasmata?
Answer : Option C
Explaination / Solution:
Chismata is formed due to crossing over. During diakinesis of prophase I of meiosis terminalisation of chiasmata takes place which indicates end of crossing over and separation of the non-sister chromatids.
