CBSE 11TH BIOLOGY - Online Test
Q1. Which one is incorrect about Glycolysis?
Answer : Option A
Explaination / Solution:
Glycolysis is not a cyclic pathway and carbon dioxide gas is not released during this cycle. Oxygen is not required for Glycolysis process. Glycolysis occurs in cytoplasm of the cell.
Q2. Phylloclade are
Answer : Option D
Explaination / Solution:
Phylloclade are green succulent stems of indefinite growth that perform thefunction of photosynthesis duet to presence of chlorophyll.
Q3. Karyokinesis is the
Answer : Option E
Explaination / Solution:
Cell division consists of karyokinesis and cytokinesis. During karyokinesis division of chromosomes takes place and during cytokinesis division of cytoplasm takes place. Ultimately the cell divides into two halves.
Q4.
In human excretory system :
i. kidneys and ureters are paired structures but urinary bladder is single.
ii. Kidneys are situated between the levels of last thoracic and third lumbar vertebra.
Answer : Option D
Explaination / Solution:
The excretory system in human consistsof a pair of kidneys, one pair of ureters, aurinary bladder and a urethra. Kidneys are reddish brown, bean shaped structures situated between the levels of last thoracic and third lumbarvertebra close to the dorsal inner wall of the abdominal cavity.
Q5. Which is the function of companion cells?
Answer : Option A
Explaination / Solution:
companion cell: any of a number of specialized parenchymal cells adjacent to a sieve tube in the phloem of flowering plants, believed to regulate the flow of nutrients through the tube.
Q6. S-shaped graph produced on plotting growth against time is called
Answer : Option A
Explaination / Solution:
S- Shaped growth curve (Sigmoid growth curve) A pattern of growth in which, in a new environment, the population density of an organism increases slowly initially, in a positive acceleration phase; then increases rapidly approaching an exponential growth rate; but then declines in a negative acceleration phase until at zero growth rate the population stabilizes.
This slowing of the rate of growth reflects increasing environmental resistance which becomes proportionately more important at higher population densities.
This type of population growth is termed ‘density dependent’.
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Q7. In a scientific name, the name of the author is printed in
Answer : Option B
Explaination / Solution:
Name of the author appears after the specific epithet, i.e., at the end of the biological name and is written in an abbreviated form, e.g., MangiferaindicaLinn. It indicates that this species was first described by Linnaeus. Hence, the correct option is Abbreviated.
Q8. Which of the following statements is/are incorrect about sliding filament theory of muscle contraction?
Answer : Option B
Explaination / Solution:
During contraction, the ‘I’ bands get reduced, whereas the ‘A’ bands retain the length.
Q9. When water moves out of the cell and the cell membrane of a plant cell shrinks away from its cell is called
Answer : Option C
Explaination / Solution:
Plasmolysis is the process of shrinkage or contraction of the protoplasm of a plant cell as a result of loss of water from the cell.
Plasmolysis is one of the results of osmosis and occurs very rarely in nature, but it happens in some extreme conditions.
Q10. The junctions which help to stop substances from leaking across a tissue is
Answer : Option A
Explaination / Solution:
Tight junctions hold cells together. They are narrow belts that circle around the upper part of lateral surfaces of the adjacent epithelial cells to create a fusion point. They stop substances from leaking across a tissue as they prevent passage of molecules and ions through space between adjacent cells.
