Zoology - Online Test
Q1. Conditional reabsorption of sodium ions and water takes place in
Answer : Option D
Explaination / Solution:
Distal Convoluted Tubule (DCT): Conditional reabsorption of Na+ and water takes place in this segment. DCT is also capable of reabsorption of HCO3- and selective secretion of hydrogen and potassium ions and NH3 to maintain the pH and sodium-potassium balance in blood.
Q2. Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?
Answer : Option B
Explaination / Solution:
Protobionts that include coacervates and microspheres are involved in origin of life from inorganic substance. Coacervate and microspheres are separate combinations of molecules from surroundings that leads to formation of first life on earth.
Q3. A virus differ from a bacterium as it contains
Answer : Option B
Explaination / Solution:
Virus differs from bacteria in terms of having DNA or RNA as genetic material with no ribosomes. Virus can replicate inside the host cell but become inactive outside the host cell.
Q4. At the base of skull, a large hole is present which allows brain to continue with the spinal cord. That hole is called :
Answer : Option D
Explaination / Solution:
Foramen Magnum is the largest foramen situated on the base of the skull through which multiple structures pass including the Spinal Cord. It acts as a passage between the cranial vault and the base of the skull.
Q5. AIDS causing virus has
Answer : Option D
Explaination / Solution:
Acquired immunodeficiency syndrome is caused by human immuno virus. This virus has single stranded RNA as genetic material in place of DNA.
Q6. Amniocentesis for sex determination is legally banned to
Answer : Option C
Explaination / Solution:
Amniocentesis is a test to known chromosomal pattern of embryo that can reveals the sex of foetus. Large number of female foetus is aborted after knowing the sex of foetus. So it is illegal to check sex of foeticide.
Q7. Two animal cells are interconnected by
Answer : Option B
Explaination / Solution:
Two animal cells are interconnected by desmosomes, through which exchange of materials takes place between two cells. It is formed from protein plaques in the cell membranes linked by filaments.
Q8. The asexual reproduction in fungi takes place by
Answer : Option D
Explaination / Solution:
Asexual reproduction in fungi is by spores called conidia or sporangiospores or zoospores, and sexual reproduction is by oospores, ascospores and basidiospores.
Q9. Orchid shows commensalism as interaction with
Answer : Option D
Explaination / Solution:
Commensalism is interaction in which one species is benefited by other is neither benefited nor harmed. Orchids growing on mango tree do not harm the mango plants but get shelter.
Q10. The arrows represent :[upward to downward]
Answer : Option C
Explaination / Solution:
The figure shows the muscular sac called the gall bladder. The duct of gall bladder (cystic duct) along with the hepatic duct from the liver forms the common bile duct.
