9th Class Biology Question Paper. We covered all the 9th Class Biology Question Paper MCQs in this post for free so that you can practice well for the exam.
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9th Class Biology Objective Question Paper for Students
Change in the basic sequence of a gene is known as
(a) mutation
(b) transversion
(c) conjugation
(d) reproduction
Option a – mutation
Which phenomenon leads to the variation in DNA?
(a) DNA Mutation
(b) Linkage
(c) Both (a) and (b)
(d) Mitosis
Option a – DNA Mutation
Chromosomal aberrations are commonly found in
(a) cancer cells
(b) normal cells
(c) healthy cells
(d) autosomal cells
Option a – cancer cells
Point mutation arises due to a change in
(a) a single base of DNA
(b) a single base pair of DNA
(c) a segment of DNA
(d) a double base pair of DNA
Option a – a single base of DNA
A classical example of point mutation is
(a) sickle-cell anemia
(b) thalassemia
(c) cancer
(d) All of the above
Option a – sickle-cell anemia
Frameshift mutation arises due to
(a) deletion of a base pair of DNA
(b) insertion of a base pair of DNA
(c) Both (a) and (b)
(d) change in a single base pair of DNA
Option c – Both (a) and (b)
Mutagens are
(a) chemical agents that cause changes in DNA
(b) physical agents that cause mutations
(c) cancer-producing agents
(d) Both (a) and (b)
Option d – Both (a) and (b)
Genes located on mitochondrial DNA
(a) generally show maternal inheritance
(b) are always inherited from the male parent
(c) show biparental inheritance
(d) are not inherited like nuclear genes
Option a – generally show maternal inheritance
The number of chromosomes in a normal human body cell is
(a) 43
(b) 44
(c) 45
(d) 46
Option d – 46
Sexual reproduction causes genetic variation because of
(a) blending of genes
(b) chromosomal changes
(c) shuffling of genes
(d) All of the above
Option d – All of the above
Mutation is a phenomenon that results in the alteration of
(a) sequence
(b) carbohydrates
(c) proteins
(d) fat
Option a – sequence
Mutation may result in
(a) a change in genotype
(b) a change in phenotype
(c) a change in metabolism
(d) All of the above
Option d – All of the above
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