CBSE Class 10 Science Heredity Assignment Set G

Question. When a red flower homozygous pea plant is crossed with a white flower plant what colour is produced in F1 ?
(a) Red
(b) White
(c) Pink
(d) Red and white

Answer: A

Question. The main aim of plant breeding is
(a) to produce improved varieties
(b) to make soil fertile
(c) to control pollution
(d) to become more progressive

Answer: A

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. Plants having similar genotypes produced by plant breeding are called
(a) clone
(b) haploid
(c) autopolyploid
(d) genome

Answer: A

Question. A cross between AaBB X aa BB yields a genotypic ratio of
(a) 1 AaBB : 1 aaBB
(b) 1 AaBB : 3 aaBB
(c) 3AaBB : 1 aa BB
(c) All AaBb

Answer: A

Question. Two allelic genes are located on
(a) the same chromosome
(b) two homologous chromosomes
(c) two non-homologus chromosomes
(d) any two chromosomes

Answer: B

Question. In monohybrid cross what is the ratio of homozygous dominant and homozygous recessive individual in F2 - generation ?
(a) 1 : 2 : 1
(b) 2 : 1 / 1 : 2
(c) 3 : 1 / 1 : 3
(d) 1 : 1

Answer: D

Question. Mendel’s law of segregation is based on separation of allels during
(a) gamete formation
(b) seed formation
(c) pollination
(d) embryonic development

Answer: A

Question. Back cross is a cross between
(a) F1 × F1
(b) F1 × Recessive
(c) F1 × Dominant
(d) F1 × any parent

Answer: D

Question. What is the effect of sexual reproduction ?
(a) Offspring is weak
(b) Offspring is like the parent
(c) Offspring is more vigorous
(d) Offspring is diseased

Answer: C

Question. A white flowered mirabilis plant rr was crossed with a red coloured RR, if 120 plants are produced in F2 generation. The result would be
(a) 90 uniformly coloured and 30 white
(b) 90 Non - uniformly coloured and 30 white
(c) 60 Non-uniformly coloured and 60 white
(d) All coloured and No white

Answer: B

Question. Disease resistant varieties can be produced by
(a) crossing a plant with wild variety
(b) treating with colchicine
(c) crossing with hormones
(d) treating with low temperature

Answer: A

Question. Which one caries extra nuclear genetic material ?
(a) Plastids
(b) Ribosomes
(c) Chromosomes
(d) Golgi - complex

Answer: A

Question. Heterozygous tall plants were crossed with dwarf plants, what will be the ratio of dwarf plants in the progeny
(a) 50%
(b) 25%
(c) 75%
(d) 100%

Answer: A

Question. The ratio of phenotype in F2 generation of a dihybrid cross is
(a) 3 : 1
(b) 1 : 2 : 1
(c) 2 : 1
(d) 9 : 3 : 3 : 1

Answer: D

Question. A pure tall plant can be differentiated from a hybrid tall plant
(a) by measuring length of plant
(b) by spraying gibberellins
(c) if all plants are tall after self-pollination
(d) if all plants are dwarf after self-pollination

Answer: C

Question. Allel is the
(a) alternate trait of a gene pair
(b) total number of genes for a trait
(c) total number of chromosomes of haploid set
(d) total number of genes present a chromosome

Answer: A

Question. Branch of biology deal s with heredity and variation is called
(a) Palaentology
(b) Evolution
(c) Genetics
(d) Ecology

Answer: C

Question. The factors which represent the contrasting pairs of characters are called
(a) Dominant
(b) Recessive
(c) Determinants
(d) Alleles

Answer: D

Question. In animals sex determination is due to
(a) X-chromosome
(b) Y - chromosome
(c) A - chromosome
(d) B - chromosome

Answer: B