Cell Cycle and Cell Division - Online Test
Q1. Diplotene stage can lasts for months or years. Dinoflagellates possess condensed chromosomes even in interphase, their nucleus is called
Answer : Option B
Explaination / Solution:
In oocytes of some vertebrates, diplotene can last for months or years.Such nucleus showing arrested diplotene stage is called mesokaryotic nucleus.
Q2. Inter kinesis is followed by which type of cell division that helps in regeneration?
Answer : Option C
Explaination / Solution:
The stage between the two meiotic divisions is called interkinesis and is generally short lived. Interkinesis is followed by prophase II, a much simpler prophase than prophase I.
Q3. Crossing over occurs in
Answer : Option D
Explaination / Solution:
Crossing over occurs in pachytene sub-stage of prophase of meiosis I. During which exchange of genetic materials takes place between homologous chromosomes.
Q4. A cell divides every minute. It will fill a 100 ml beaker in one hour. How much time would it take to fill 50 ml beaker.
Answer : Option B
Explaination / Solution:
If a cell divide every minute, the number of cells get doubled at the end of each minutes. If a 100 ml beaker is filled in one hour, it will take 59 minute to fill 50 ml beaker.
Q5. A plant X has 2n= 8 chromosomes, how many chromosomes are present in daughter cells after meiosis II.
Answer : Option C
Explaination / Solution:
The number of chromosome reduces to half at the end of meiosis cell division. If plant has 2n= 8 chromosome the number of chromosomes present in daughter cells after meiosis II is 4 only.
Q6. Cell growth results in disturbing the ratio between
Answer : Option B
Explaination / Solution:
Cell growth results in disturbing the ratio between the nucleus and the cytoplasm. It therefore becomes essential for the cell to divide to restore the nucleo-cytoplasmic ratio. Cell becomes stable when N/C ratio is 1.
Q7. In some lower plants and social insects, the haploid cells are divide by
Answer : Option C
Explaination / Solution:
Mitosis is called equational division. Since the parent cells are haploi so mitosis will lead to restoration of chromosome number in haploid cells.
Q8. M- phase undergoes
Answer : Option C
Explaination / Solution:
Since, in mitosis the number of chromosomes in the parent and progeny cells is the same, it is also called as equational division.
Q9. In plant cells, the new cell wall begins by the
Answer : Option B
Explaination / Solution:
In plant cells, wall formation starts in the centre of the cell and grows outward to meet the existing lateral walls. The formation of the new cell wall begins with the formation of a simple precursor, called the cell plate which hardens to give rise to middle lamella.
Q10. In between two walls of adjacent cells are seen
Answer : Option B
Explaination / Solution:
The middle lamella cements the tertiary walls of two adjacent plant cells. It is formed out of materials of cell plate.
