Short Answer Type Questions
1. In a bisexual flower in spite of the young stamens being removed artificially, the flower
produces fruit. Provide a suitable explanation for the above situation.
2. Can you consider cell division as a type of reproduction in unicellular organism? Give one
reason.
3. What is a clone? Why do offsprings formed by asexual reproduction exhibit remarkable
similanty?
4. Explain how, offspring and parents of organisms reproducing sexually have the same
number of chromosomes?
5. Colonies of yeast fail to multiply in water, but multiply in sugar solution. Give one reason
for this
5. Why does oread mould grow profusely on a moist slice of bread rather than on a dry slice
of bread?
. Give two reasons for the appearance of variations among the progeny formed by sexual
reproduction
5. Would a Planaria cut vertically into two halves regenerate into tiso individuals? Complete
Answers
Answer:
1• In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit
2• Unicellular organisms reproduce by asexual reproduction which is simple division of parent cell into two daughter cells. ... Hence, cell division can be considered as mode of reproduction in single celled organisms.
3• Clone refers to offspring of an organism formed by asexual method of reproduction. Since they possess exact copies of the DNA of their parent, clones exhibit remarkable similarity.
4• Each gamete has 23 (n=Haploid) chromosomes that mean half the number of chromosomes in a parent cell (diploid 2n=46 chromosomes). ... Hence both the parents and offspring have the equal number of chromosomes.
5• When the colony of yeast is in water, it does not get nutrition. ... As the yeast gets nutrition and thus energy, it grows and begin to produce buds. This is why colonies of yeast fail to multiply in water, but multiply in sugar solution.
6• Bread mold grows profusely on a moist slice of bread rather than on a dry slice of bread because microorganisms need optimum temperature and moisture to grow and if there is no moisture they will not grow profusely.
7• Production of genetic variation during sexual reproduction is result of: (1) Meiosis during gamete formation; crossing over and independent assortment of genes produce genetic variations.
8• Planaria possesses great power of regeneration. Thus if the body is cut into two vertical halves, each piece of the body of Planaria grows into a complete individual.
Explanation:
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