Cell Cycle and Cell Division - Online Test
Q1. Astral body are formed of
Answer : Option C
Explaination / Solution:
Astral body are formed of microtubules. Astral bodies are produced by centriolar division proir to start of during cell division and attach with centromere of the chromosome during.
Q2. Plant mitosis is generally controlled by
Answer : Option D
Explaination / Solution:
In plant cell, mitosis cell division is generally controlled by cytokinin hormone. It increase the rate of cell division leading to increased cell production. Auxinis also required for cell division in plant.
Q3. During mitosis ER and nucleolus begin to disappear at
Answer : Option C
Explaination / Solution:
During mitosis ER and nucleolus begin to diappear at late prophase stage indicated the beginning of next phase. It happens due to increased divisional activities of nucleus.
Q4. In animal cells, Cytokinesis takes place by furrow deepening centripetally and formation of two daughter cells. This method is known as
Answer : Option D
Explaination / Solution:
In animal cell, cytokinesis takes place by furrow which appears at the margins of plasma membrane and gradually deepens towards the central part of the cell. Ultimately the furrow divides the cell into two halves. This method of cytokinesis is known as cleavage cytokinesis.
Q5. An alkaloid widely used in plant breeding for doubling the chromosome number also known as ‘mitotic poison’ is
Answer : Option C
Explaination / Solution:
Colchicine is an alkaloid used in plant breeding for doubling of chromosomes by inhibiting cytokinesis. It is also called as mitotic poison. It is extracted from the bark of plant belonging to genus Colchicum.
Q6. Material used for study of mitotic cell division in class room is
Answer : Option A
Explaination / Solution:
The most common material used for study of mitosis cell division in class room is onion root and broad bean root tip. They can be grown quickly and in all seasons. Also they are esier to handle with and divisional stages are completed quickly.
Q7. A grown up cell divides when a maximum size is attained and which disturb the
Answer : Option B
Explaination / Solution:
A disturbance in the nucleoplasmic ratio will cause the cell to divide and attain stable ration which is 1. If it is less or more than 1 the cell becomes unstable and divides agin.
Q8. Which type of cell division helps in regeneration?
Answer : Option A
Explaination / Solution:
Regeneration is the ability of organism to regain its lost body parts. Regeneration is achieved by mitotic cell division to maintain same number of chromosomes in the cell.
Q9. In meiosis
Answer : Option D
Explaination / Solution:
Meiosis cell division consists of two phases. First phase is called meiosis I during which number of chromosome reduce to half the number in parent cells. In meiosis II chromosome number remain same.
Q10. The stage connecting meiosis I and meiosis II is
Answer : Option B
Explaination / Solution:
Interkinesis is the stage connecting meiosis I and meiosis II cell division. It is a brief period between two stages. No DNA synthesis occurs during this period. The cellundergoes preparation for next divisional stages.
