CBSE Class 10 Science Heredity and Evolution MCQs Set 06

Question: According to the evolutionary theory formation of a new species occurs generally due to
a) Sudden creation by nature
b) Accumulation of variations over several generations
c) Clones formed during asexual reproduction
d) Movement of individuals from one habitat to another
Answer: b

Question: The sex of a child is determined by which of the following?
a) The length of the mother’s pregnancy
b) The length of time between ovulation and copulation
c) The presence of an X chromosome in an ovum
d) The presence of a Y chromosome in a sperm
Answer: d

Question: An example of homologous organs is
a) Our arm and a dog‘s fore-leg
b) Our teeth and an elephant‘s tusks
c) Potato and runners of grass
d) All of the above
Answer: b

Question: Which of the following statement is incorrect?
a) For every hormone there is a gene
b) For every protein there is a gene
c) For production of every enzyme there is a gene
d) For every type of fat there is a gene
Answer: d

Question: Select the group which shares maximum number of common characters
a) Two genera of two families
b) Two species of a genus
c) Two genera of a family
d) Two individuals of a species
Answer: d

Question: A section of DNA providing information for one protein is called _____________
a) Nucleus
b) Chromosomes
c) Trait
d) Gene
Answer: d

Question: zygote which has inherited an X chromosome from the father will develop into :
a) Baby boy
b) Baby girl
c) Adult
d) Either boy or girl
Answer: b

Question: The ratio of each phenotype of the seeds of pea plants in the F2 generation is 9:3:3:1, it is known as:
a) Tetra hybrid ratio
b) Monohybrid ratio
c) Dihybrid ratio
d) Tri hybrid ratio
Answer: c

Question: New species may be formed if
a) DNA undergoes significant changes in germ cells
b) Chromosome number changes in the gamete
c) There is no change in the genetic material
d) Mating does not take place
Answer: a

Question: Mendel proposed that every character is controlled by
a) One factor
b) Two factors
c) One chromosome
d) Two chromosomes
Answer: b

Question: Which of the following scientist gave the principles of inheritance?
a) Mendel
b) Griffin
c) Johanssen
d) Watson and Crick
Answer: a

Question: In human males all the chromosomes are paired perfectly except one. This /these unpaired chromosome is/are:
i) Large chromosome ii) Small chromosome iii) Y chromosome iv) X chromosome
a) (i) and (ii)
b) (iii) only
c) (iii) and (iv)
d) (ii) and (iv)
Answer: c

Question: A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic makeup of the tall parent can be depicted as
a) TTWW
b) TTww
c) TtWW
d) TtWw
Answer: c

Question: Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round, yellow (RrYy) seeds. When F1 plants are selfed, the F2 progeny will have new combinations of characters. Choose the new combination from the following:
a) Round, yellow
b) Round, green
c) Wrinkled, yellow
d) Wrinkled, green
Answer: d

Question: Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that
a) Reptiles have evolved from birds
b) There is no evolutionary connection between reptiles and birds
c) Feathers are homologous structures in both the organisms
d) Birds have evolved from reptiles
Answer: d

Question: Which of the following is not correct
a) For every hormone there is a gene
b) For every protein there is a gene
c) For production of every enzyme there is a gene
d) For every molecule of fat there is a gene
Answer: d

Question: Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny having round, yellow (RrYy) seeds. When F1 plants are selfed, the F2 progeny will have the following combination of characters
a) 15:1
b) 9:3:3:1
c) 9:3:4
d) 12:3:1
Answer: b

Question: In evolutionary terms, we have more in common with
a) A Chinese school-boy
b) A chimpanzee
c) A spider
d) A bacterium
Answer: a

Question: Select the statements that describe characteristics of genes
a) Genes are specific sequence of bases in a DNA molecule
b) A gene does not code for proteins
c) In individuals of a given species, a specific gene located on a particular chromosome
d) Each chromosome has only one gene
Answer: a

Question: The science of heredity is known as:
a) Biology
b) Embryology
c) Genetics
d) Biochemistry
Answer: c

Question: Which of the following may be used to obtain an F2 generation?
a) Allowing flowers on an F1 plant to be self-pollinated
b) Cross-pollinating two parent plants
c) Cross-pollinating an F1 plant with a parent plant
d) Allowing flowers of a parent plant to be self-pollinated
Answer: a

Question: A pair of contrasting characters is called
a) phenotype
b) genotype
c) allele
d) gene
Answer: c

Question: The human animal which has an XY pair of chromosomes is called:
a) Male
b) Hybrid
c) Female
d) Doomed
Answer: a

Question: A basket of vegetables contains carrot, potato, radish, and tomato. Which of them represent the correct homologous structure?
a) Carrot and potato
b) Carrot and tomato
c) Radish and carrot
d) Radish and potato
Answer: c

Question: A pregnant woman has an equal chance of her baby being blood group A or blood group AB. Which one of the following shows the possible genotypes of the woman and the father of her child?
a) IAIA and IBIO
b) IAIB and IBIO
c) IAIO and IBIO
d) IAIB and IAIO
Answer: a

Question: If a homozygous red-flowered plant is crossed with a homozygous white-flowered plant, the offspring would be:
a) Half red-flowered
b) Half white-flowered
c) All red-flowered
d) Half pink-flowered
Answer: c

Question: A normal cell of human body contains 23 pairs of chromosomes. The number of chromosomes in a sex cell (sperm or ovum) of a human being is most likely to be:
a) 46
b) 23
c) 21
d) 42
Answer: b

Question: Mendel used for his experiments on heredity:
a) Papaya plants
b) Potato plants
c) Pea plants
d) Pear plants
Answer: c

Question: In order to ensure that he had pure-breeding plants for his experiments, Mendel:
a) Cross-fertilized each variety with each other
b) Let each variety self-fertilize for several generations
c) Removed the female parts of the plants
d) Removed the male parts of the plants
Answer: b

Question: The exchange of genetic material takes place in:
a) Vegetative reproduction
b) Asexual reproduction
c) Sexual reproduction
d) Budding
Answer: c