Biology - Online Test
Q1. 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.
Q2. Stem cutting is used in the propagation of
Answer : Option C
Explaination / Solution:
Stem cutting is a mode of vegetative propagation in which stem is cut into pieces having at least one node. From the node new plantlet emerge out. Mango and cotton are grown by seeds and Banana by root cutting.
Q3. 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.
Q4. 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.
Q5. 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.
Q6. A concept fundamental to understanding water movement is called
Answer : Option A
Explaination / Solution:
Plant-water relations, an understanding of certainstandard terms is necessary. Water potential is a concept fundamental to understand water movement. Solute potential and pressure potential are the two main components that determine water potential.
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. Which one is not a reason of mineral depletion in the soil?
Answer : Option D
Explaination / Solution:
Mineral deficiency in soil may be due to use of high yielding varieties, non-rotation of crops and leeching of minerals. Growing leguminous plants do not deplete the mineral in soil.
