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Practice each question, then open the answer or worked solution.
Between a prokaryote and a eukaryote, which cell has a shorter cell division time?
Ans: Prokaryotic cells have a shorter cell division time.Bacteria tooks 30-60 mins to divide.
Which of the phases of the cell cycle is of longest duration?
Ans: Interphase of the cell cycle is of longest duration.Its time period is generally 18-20 hours.
Name a stain commonly used to colour chromosomes.
Ans: Acetocarmine and Giemsa stain.
Which tissue of animals and plants exhibits meiosis?
Ans: Germ cells of male and female reproductive organs in animals and plants exhibit meiosis.
Given that the average duplication time of E. coli is 20 minutes, how much time will two E. coli cells take to become 32 cells?
Ans: 1 hour 20 minutes required by the two E. coli cells to become 32 cells.
Number of cells after 20 minutes = 4 cells
Number of cells after 40 minutes = 8 cells
Number of cells after 60 minutes = 16 cells
Number of cells after 80 minutes = 32 cells
Which part of the human body should one use to demonstrate stages in mitosis?
Ans: Any part containing somatic cells can be used to demonstrate stages in mitosis in human beings.Germinal cells of human body divide by the meiosis.
What attributes does a chromatid require to be classified as a chromosome?
Ans: There should be two identical sister chromatids attached at centre by centromere; to be classified as a chromosome.
The diagram shows a bivalent at prophase-I of meiosis. Which of the four chromatids can cross over?
Ans: In this case, non-sister chromatids can cross over. It is important to remember that crossing over always takes place between two non-sister chromatids and never between two sister chromatids.
If a tissue has at a given time 1024 cells, how many cycles of mitosis had the original parental single cell undergone?
Ans: The product of each cycle of mitosis is 2 daughter cells. One can solve the above problem via the formula-: No. of daughter cells = 2no. of cycles. Hence , the cell must undergo 10 rounds of mitosis to produce 1024 cells.
An anther has 1200 pollen grains. How many pollen mother cells must have been there to produce them?
Ans: \[\dfrac{{1200}}{4} = 300\]
This is because one mother cell produces four daughter cells after meiosis.Hence , 300 pollen mother cells are required to produce 1200 pollen grains.