Cell The Unit of Life - Online Test
Q1. The centrioles are absent in
Answer : Option B
Explaination / Solution:
Animal cells have centrioles which are absent in almost all plant cells.
Q2. The ribosomes of a polysome translate
Answer : Option C
Explaination / Solution:
Several ribosomes may attach to a single mRNA and form a chain called polyribosomes or polysome. The ribosomes of a polysome translate the mRNA into proteins.
Q3. Middle lamella is mainly composed of
Answer : Option C
Explaination / Solution:
The middle lamella is a layer mainly of calcium pectate which holds or glues the different neighbouring cells together.
Q4. Plasmodesmata takes parts in
Answer : Option D
Explaination / Solution:
The cell wall and middle lamellae may be traversed by plasmodesmata which connect the cytoplasm of neighbouring cells by forming mitotic plates.
Q5. Who was the first to explain that cells divide?
Answer : Option C
Explaination / Solution:
The German doctor Rudolf Virchow proposed in 1855 that all cells result from the division of previously existing cells, and this idea became a key piece of modern cell theory.
Q6. Which of the following statements with reference to cytoskeleton is not correct?
Answer : Option D
Explaination / Solution:
The cytoskeleton in a cell is involved in functions like mechanical support, motility, maintenance of the shape of the cell.
Q7. The organelle involved in respiration is
Answer : Option A
Explaination / Solution:
Mitochondria are the sites of aerobic respiration. They produce cellular energy in the form of ATP
Q8. Cell organelles with single membrane is
Answer : Option C
Explaination / Solution:
Lysosomes are single membrane structures containing enzymes for digestion of all types of macromolecules.
Q9. The site for the light reactions is
Answer : Option A
Explaination / Solution:
In plant cells, the chloroplasts are responsible for trapping light energy essential for photosynthesis. The grana, in the plastid, is the site of light reactions.
Q10. Select the incorrect matching
Answer : Option C
Explaination / Solution:
The nucleus contains the chromosomes which in turn contain the genetic material, DNA.
