CBSE Class 10 Science Heredity and Evolution MCQs Set 07

Question: Plant with two ‘small’ genes breeds with a plant with two ‘tall’ genes to produce:
a) Small plants and tall plants in the ratio 1:3
b) All small plants
c) All tall plants
d) Tall plants and small plants in the ratio 3:1
Answer: c

Question: When two parents are crossed, the offspring are referred to as:
a) Recessive
b) Test cross
c) F1 generation
d) F2 generation
Answer: c

Question: The following results were obtained by a scientist who crossed the F1 generation of pure-breeding parents for round and wrinkled seeds.
Dominant trait – Round seeds
Recessive trait – Wrinkled seeds
No. of F2 offspring – 7524
From these results, it can be concluded that the actual number of round seeds he obtained was:
a) 1881
b) 22572
c) 2508
d) 5643
Answer: d

Question: Two pink colored flowers on crossing results in 1 red, 2 pink, and 1 white flower progeny. The nature of the cross is –
a) Cross fertilization
b) Self-pollination
c) Double fertilization
d) No fertilization
Answer: a

Question: The palisade cells of a species of plant contain 28 chromosomes. How many chromosomes will there be in each gamete produced by the plant?
a) 56
b) 28
c) 14
d) 4
Answer: c

Question: In the human blood grouping, the four basic blood types are type A, type B, type AB, and type O. The blood proteins A and B are:
a) Simple dominant recessive traits
b) Incomplete dominant traits
c) Co-dominant traits
d) Sex-linked traits
Answer: c

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

Question: A gene is a:
a) Hybrid
b) Heritable trait
c) Pure breed
d) Part of a chromosome that transmits a trait
Answer: d

Question: Who out of the following was of the strong opinion that acquired characteristics are inherited:
a) Lamarck
b) Lysenko
c) Mendel
d) Huxley
Answer: a

Question: According to the evolutionary theory, formation of a new species is 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: Vestigial organs are:
a) Primitive organs
b) Primordial organs
c) Organs reduced due to disuse
d) Organs marked only in embryonic stage
Answer: c

Question: The visible characteristic in an organism is known as:
a) Prototype
b) Stereotype
c) Phenotype
d) Genotype
Answer: c

Question: The earliest members of the human species, Homo sapiens can be traced from:
a) West Asia
b) Australia
c) East Asia
d) Africa
Answer: d

Question: The number of pair(s) of sex chromosomes in the zygote of humans is:
a) One
b) Two
c) Three
d) Four
Answer: a

Question: The two versions of a trait (character) which are brought in by the male and female gametes are situated on:
a) Copies of the same chromosome
b) Sex chromosomes
c) Two different chromosomes
d) Any chromosomes
Answer: a

Question: A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because
a) Tallness is the dominant trait
b) Shortness is the dominant trait
c) Tallness is the recessive trait
d) Height of pea plant is not governed by gene ‘T‘ or ‘t‘
Answer: a

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 molecule of fat there is a gene
Answer: d

Question: In peas, a pure tall plant (TT) is crossed with a pure short plant (tt). The ratio of pure tall plants to pure short plants in F2 generation will be:
a) 1 : 3
b) 3 : 1
c) 1 : 1
d) 2 : 1
Answer: c

Question: Which of the following is a test cross?
a) TT × tt
b) Tt × tt
c) Tt × TT
d) tt × tt
Answer: b

Question: Normal maize has starchy seed which remain smooth when dry. A mutant form has sugary seed which go crinkled when dry. When a mutant was crossed with a normal plant, an F₁ was produced which had smooth seeds. What would be the relative ratios of the different seed types, if the F₁ was allowed to self?
a) 1 smooth : 3 sugary
b) 3 smooth : 1 sugary
c) 1 smooth : 1 sugary
d) All sugary
Answer: c

Question: From the list given below, select the character which can be acquired but not inherited:
a) Colour of eye
b) Colour of skin
c) Size of body
d) Nature of hair
Answer: c

Question: The two versions of a trait (character) which are brought in by the male and female gametes are situated on
a) Copies of the same chromosome
b) Two different chromosomes
c) Sex chromosomes
d) Any chromosome
Answer: a

Question: The rules of ___ determine the process by which traits and characteristics are reliably inherited
a) Heredity
b) Reproduction
c) Generation
d) None of the above
Answer: a

Question: Following has (have) been used for studying human evolution
a) Excavating
b) Time dating
c) Determining DNA sequences
d) All of the above
Answer: d

Question: Mendel formulated the law of purity of gametes on the basis of:
a) Dihybrid cross
b) Monohybrid cross
c) Back cross
d) Test cross
Answer: b

Question: A trait in an organism is influenced by
a) Paternal DNA only
b) Maternal DNA only
c) Both maternal and paternal DNA
d) Neither by paternal nor by maternal DNA
Answer: c

Question: Which of the following would stop evolution by natural selection from occurring?
a) If humans became extinct because of a disease epidemic
b) If a thermonuclear war killed most living organisms and changed the environment drastically
c) If ozone depletion led to increased ultraviolet radiation, which caused many new mutations
d) If all individuals in a population were genetically identical, and there was no genetic recombination, sexual reproduction, or mutation
Answer: d

Question: The preserved traces of living organisms are called
a) Fossils
b) Species
c) Non-living materials
d) None of the above
Answer: a

Question: Following have four limbs
a) Mammals
b) Amphibians
c) Reptiles
d) All of the above
Answer: d

Question: Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be
a) Double fertilisation
b) Self pollination
c) Cross fertilisation
d) No fertilisation
Answer: c

Question: Following is (are) descended from wild cabbage
a) Red cabbage
b) Broccoli
c) Cauliflower
d) All of the above
Answer: d

Question: The frequency of certain genes in a population changed over generations. This is the essence of the idea of ____________ .
a) Revolution
b) Evolution
c) Reproduction
d) Production
Answer: b

(a) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If Assertion is correct but Reason is incorrect.
(d) If Assertion is incorrect but Reason is correct.

Question:
Assertion: We have lost all the direct evidence of origin of life.
Reason: The persons responsible for protecting evidences were not skilled.
Answer: c

Question:
Assertion: Among the primates, chimpanzee is the closest relative of the present day humans.
Reason: The banding pattern in the autosome numbers 3 and 6 of man and chimpanzee is remarkably similar.
Answer: a

Question:
Assertion: Human ancestors never used their tails and so the tail expressing gene has disappeared in them.
Reason: Lamarck’s theory of evolution is popularly called theory of continuity of germplasm.
Answer: c

Question:
Assertion: Although living organism always arise from other living organism, life should certainly have had a beginning.
Reason: The study of the conditions and the mechanisms involved in the creation of most primitive living structures on earth is actually the problem of origin of life.
Answer: a

Question:
Assertion: The birds have large, light spongy bones with air sacs.
Reason : These adaptations help them during flight.
Answer: a