10TH CBSE heredity 50 MCQS QUIZ

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Heredity

5 Theory-Based MCQ Tests • 10 Questions Each • 50 Questions

Instructions

• 5 separate tests with 10 questions each.
• Only theory/concept-based questions are included.
• Submit a test to calculate your score.
• Correct answers remain hidden until the password is entered.

Password: required only after submission to reveal correct answers.

Test 1 — Mendel & Basic Heredity

10 questions • 1 mark each

1. The branch of biology that deals with heredity and variation is:

A. Genetics B. Reproduction C. Sericulture D. Evolution

2. Mendel used the term ______ for what are now called genes.

A. Traits B. Factors C. Alleles D. Chromosomes

3. The resemblance of individuals to their progenitors is called:

A. Genetics B. Heredity C. Evolution D. Variation

4. The genetic constitution of an organism is called its:

A. Phenotype B. Genotype C. Trait D. Allele

5. The observable characters of an organism are referred to as its:

A. Genotype B. Phenotype C. Factors D. Genes

6. Mendel's laws are known as the laws of:

A. Germplasm B. Inheritance C. Origin of species D. Recapitulation

7. Mendel considered how many contrasting characters of pea plants in his experiments?

A. 2 B. 4 C. 7 D. 14

8. Mendel proposed that every character is controlled by:

A. One chromosome B. Two factors C. One factor only D. Two chromosomes

9. A gene is described in the source as the functional unit of:

A. Protein B. DNA C. Cell membrane D. Cytoplasm

10. Mendelism is related to:

A. Heredity in living beings B. Mutation only C. Meiosis only D. Asexual reproduction

Correct answers are locked.

Test 2 — Dominance, Alleles & Crosses

10 questions • 1 mark each

1. An allele is said to be dominant when it is expressed in:

A. Only homozygous condition B. Only heterozygous condition C. Both homozygous and heterozygous conditions D. Only the second generation

2. Different forms of a gene are called:

A. Genotypes B. Phenotypes C. Alleles D. Chromosomes

3. The dwarf trait in Mendel's pea experiments was:

A. Dominant B. Recessive C. Codominant D. Incomplete dominant

4. A tall plant represented by Tt is:

A. Homozygous dominant B. Homozygous recessive C. Heterozygous D. A recessive phenotype

5. A true-breeding tall plant is represented by:

A. TT B. Tt C. tt D. T

6. A tall plant that always produces tall offspring is described as:

A. Heterozygous B. Homozygous dominant C. Homozygous recessive D. Codominant

7. According to the law of segregation, germ cells receive:

A. Both paired alleles B. One of the paired alleles C. One quarter of the genes D. Any pair of alleles

8. A monohybrid cross deals with inheritance of:

A. One pair of contrasting characters B. Two pairs of contrasting characters C. Three pairs of characters D. Only sex chromosomes

9. A dihybrid cross deals with inheritance of:

A. One pair of contrasting characters B. Two pairs of contrasting characters C. Only one allele D. Only one phenotype

10. The 9 : 3 : 3 : 1 ratio is associated with a:

A. Monohybrid cross B. Dihybrid cross C. Test cross D. F1 generation

Correct answers are locked.

Test 3 — Chromosomes, Sex Determination & Genetics

10 questions • 1 mark each

1. A normal human being has how many chromosomes?

A. 42 B. 44 C. 46 D. 48

2. Human females normally have which sex chromosome combination?

A. XY B. XX C. YY D. XO

3. Human males normally have which sex chromosome combination?

A. XX B. XY C. YY D. XO

4. The sex of a human child is genetically determined at the time of:

A. Birth B. Fertilisation C. Puberty D. Adolescence

5. A human female produces ova carrying:

A. Either X or Y B. Only X C. Only Y D. XX

6. A human male produces two types of sperm carrying:

A. Only X B. Only Y C. Either X or Y D. XX

7. A zygote that inherits an X chromosome from the father develops as:

A. A boy B. A girl C. Either boy or girl D. Neither

8. The maleness of a child is associated with the presence of:

A. An X chromosome in the ovum B. A Y chromosome in the zygote C. Two X chromosomes D. An autosome only

9. The chromosomes responsible for determining sex are called:

A. Autosomes B. Sex chromosomes C. Body chromosomes D. Somatic genes

10. Genes are located on:

A. Ribosomes B. Chromosomes C. Cell membranes D. Vacuoles

Correct answers are locked.

Test 4 — Variations & Evolution

10 questions • 1 mark each

1. Differences between organisms belonging to the same species are called:

A. Heredity B. Variations C. Genotypes D. Factors

2. Which is an example of continuous variation from the source?

A. Eye colour B. Hair colour C. Weight D. Sex

3. Traits acquired during an organism's lifetime are called:

A. Inherited traits B. Acquired traits C. Dominant traits D. Recessive traits

4. Acquired characters are generally not inherited because they do not change the DNA of:

A. Body cells B. Germ cells C. All cells D. Chromosomes only

5. Accumulation of variations can increase the chances of survival in a:

A. Changing environment B. Fixed environment only C. Laboratory only D. Single generation only

6. A sudden change in genetic material is called:

A. Variation B. Mutation C. Heredity D. Selection

7. All variations in a species have:

A. Equal chances of survival B. Different possible effects on survival C. No effect on survival D. Only harmful effects

8. The selection of individuals with desired characters by humans is called:

A. Natural selection B. Artificial selection C. Reproductive isolation D. Genetic drift

9. The basis for distinguishing two similar groups as separate species is:

A. Reproductive isolation B. Nutrition C. Body size D. Artificial selection

10. Selection of variations by environmental factors forms a basis of:

A. Evolutionary processes B. Asexual reproduction C. Digestion D. Cell division

Correct answers are locked.

Test 5 — Homologous & Analogous Organs

10 questions • 1 mark each

1. Homologous organs generally have:

A. Similar basic structure and common origin B. Different origin and identical structure C. Only the same function D. No structural relationship

2. Analogous organs generally have:

A. Similar origin and different functions B. Different origins but similar functions C. Identical structures and origins D. No function

3. Which pair represents homologous structures?

A. Wings of butterfly and bat B. Forelimbs of cow, duck and lizard C. Wings of insect and bird D. Wings of butterfly and housefly

4. Carrot and radish are considered homologous because both are:

A. Modified roots B. Modified stems C. Fruits D. Leaves

5. Wings of insects and wings of bats are considered analogous because they:

A. Have the same origin B. Have different origins but perform the same function C. Have identical internal structures D. Have different functions

6. The presence of homologous organs in organisms indicates:

A. A common ancestry B. No evolutionary relationship C. Only identical functions D. Asexual reproduction

7. Human arms, seal flippers and bird wings are examples of:

A. Analogous structures B. Homologous structures C. Acquired traits D. Sex chromosomes

8. Wings of butterfly, housefly and bat are examples of:

A. Homologous organs B. Analogous organs C. Vestigial organs only D. Reproductive organs

9. Potato and sweet potato are described in the source as:

A. Homologous structures B. Analogous structures C. Sex chromosomes D. Alleles

10. The main distinction between homologous and analogous organs is based on:

A. Origin, structure and function B. Colour only C. Size only D. Age of the organism

Correct answers are locked.