CBSE 11TH BIOLOGY - Online Test
Q1. Which of the following is correctly matched?
Answer : Option B
Explaination / Solution:
The T-wave represents the return of the ventricles from excited to normal state.
Q2. In Ocimum sanctum(tulsi), stem is
Answer : Option A
Explaination / Solution:
The stem of Oscimum sanctum or tulsi is quadrangular in shape. The stem is covered with hairy projection.
Q3. Multinucleate condition arise when Cytokinesis does not follow karyokinesis, this type of cells are called as
Answer : Option D
Explaination / Solution:
Karyokinesis is followed by cytokinesis but some times cytokinesis is not followed by karyokinesis which leads to the establishment of multinucleate condition. This type of cells are called as coenocytes.
Q4. 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.
Q5. Jute fibers deteriorate because they have
Answer : Option A
Explaination / Solution:
Jute fibers are made of high amount of lignin that deteriorate in presence of high moisture and water,
Q6. Mathematically arithmetic growth is expressed as
Answer : Option C
Explaination / Solution:
Arithmetic growth is represented by where Lt is final growth, Lo is initial size and rt is the rate of growth and time respectively.
Q7. 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.
Q8. 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.
Q9. 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.
Q10. 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.
