Free MCQs & Online Quiz Practice for Exams

Q: The union of male and female gametes is known as

A) Fertilization

B) Oogenesis

C) Spermatogenesis

D) Gametogenesis

Q: All multicellular animals develop from a single cell called

A) Egg

B) Sperm

C) Zygote

D) Blood cell

Q: Which of the following restores diploid number of chromosomes

A) Ovulation

B) Oogenesis

C) Fertilization

D) Spermatogenesis

Q: In which of the following animals does external fertilization occur

A) Fish and amphibians

B) Reptiles

C) Birds

D) Mammals

Q: Internal fertilization occurs in

A) Fish

B) Amphibians

C) Aquatic animals

D) Mammals

Q: Genes are short segments of

A) Proteins

B) Carbohydrates

C) DNA

D) Lipids

Q: The various forms of a gene responsible for the same trait are called

A) Centromere

B) Character Trait

C) Allele

D) Natural selection

Q: Natural selection operates to produce changes in

A) Individuals

B) Populations

C) Races

D) Phyla

Q: How many different types of gametes will be produced by a plant having a genotype AaBb?

A) Three

B) Four

C) Six

D) Eight

Q: Speciation is the evolutionary process by which

A) A new gene pool is formed

B) Hybrid species is formed

C) Evolutionary path of a species converge

D) Shows differences in physical traits

Q: Phenotype is the expression of

A) Genetic makeup

B) Physical makeup

C) Chemical composition

D) Metabolism

Q: The round structure formed when DNA coils around the histone protein is

A) Centromere

B) Chiasma

C) Nucleosome

D) Chromatin

Q: An allele which completely masks the effect of other allele in a heterozygote

A) Dominant

B) Recessive

C) Co-dominant

D) Incomplete dominant

Q: The central dogma is best represented by

A) DNA + RNA → Protein

B) DNA → RNA + Protein

C) DNA → RNA → Protein

D) Protein → RNA → DNA

Q: Type of dominance pattern followed by r and I alleles of the human blood group system

A) Complete dominance

B) Incomplete dominance

C) Co-dominance

D) None of the above

Q: What are the possible genotypes of the parents of homozygous recessive individual

A) Homozygous dominant

B) Homozygous recessive

C) Heterozygous

D) Both 'b' and 'c'

Q: Energy flow through an ecosystem is always

A) Unidirectional

B) Cyclic

C) Reversible

D) Multidirectional

Q: The largest reservoir of nitrogen on our planet

A) Ocean

B) Atmosphere

C) Phage DNA

D) All of the above

Q: Overgrazing results in

A) Soil erosion

B) Retention of useful species

C) Productive soils

D) Fossil fuels

Q: The three R's responsible for a better environment are

A) Reduce Reuse Recycle

B) Random Reduce Recall

C) Read Register Recall

D) Reduce Rebuild Restrict