Contribute & Test Your Skills
- Chemical Reactions & Equations
- Acid, Bases & Salts
- Metals & Non Metals
- Carbon & Its Compounds
- Periodic Classification of Elements
- Life Processes
- Respiration
- Control and Coordination
- How Do Organism Reproduce
- Heredity and Evolution
- Light: Reflection and Refraction
- Human Eye and Colorful World
- Electricity
- Magnetic Effect of Electric Current
- Sources of Energy
- Our Environment
- Management of Natural Resources
Popular Questions
- A trait may be inherited, but may not be expressed. Justify this statement with the help of a suitable example.
- Traits that are acquired during lifetime do not result in evolution. Why?
- Bacteria have a simpler body plan when compared with human beings.
- Assertion : Evolution is called as organic evolution Reason : Evolution involves the living organisms
- Assertion : Dominant allele is an allele Reason : It is represented by a capital letter
- A man having blood group O (IOIO) marries a woman with blood group B (IBIO).
- Assertion : Changes in non-reproductive Reason : Inherited traits include the traits
- Explain how the variations get accumulated.
- Variations are the basis of heredity. Explain.
- In pea plant, round seed is dominant over the wrinkled.
- Mention three important features of fossils which help in the study of evolution.
- Distinguish between acquired and inherited characters with an example of each.
- The genotype of the height of an organism is written as Tt. What conclusion may be drawn?
- A scientist is conducting embryological studies for collecting evidence supporting evolution.
- Evolution has exhibited a greater stability of molecular structure when compared with morphological structures.
- A recessive homozygote is crossed with a heterozygote of the same gene.
- Name two human traits which show variation.
- What are homologous structures? Give an example.
- Define evolution. How does it occur? Describe,
- X, Y and Z are three animals. The animal x can fly, but animal y can only run on ground or walls
- There is no real progress occuring in the concept of evolution. Explain.
- Assertion : The sex of the children will be Reason : A human male has one x and one Y-chromosome
- In a pea plant, find the contrasting trait if
- Name any five vegetables generated from a common ancestor through artificial selection rather than natural selection.
- Explain the original idea of tracing evolutionary relationships.
- Assertion : All the female gemetes will have only X-chromosome Reason : Females are homogametic with two X chromosomes.
- Give reason for your choice. A person first crossed pure-bread pea plants having round-yellow seeds with pure-bread
- The two areas of study namely evolution and Classification are interlinked. Justify the statement.
- How do genes control the traits? Explain in detail.
- Evolution is a/an
- (i) Give the evidence that the birds have evolved from reptiles. (ii) Insects, Octopus, Planaria and vertebrates possess eyes.
- What is speciation? List four factors that could lead to speciation.
- Does geographical isolation of individuals of a species lead to formation of a new species? Provide a suitable explanation.
- A man with blood group A married a woman with blood group O and their daughter has blood group O.
- (i) How do we get an idea about the extinct (ii) What are connecting links? Give one example
- All the human races like africans, Asians, Europeans, Americans and other might have evolved from a common ancestor. Provide a few..
- (i) What is geographical isolation. (ii) Illustrate formation of a species with the help of an example
- Can sexual reproduction lead to the variations in characters, speciation and evolution? Explain
- (i) Identify the fossils A, B and C (ii) In which region was fossil C found? (iii) In which region are recent fossils found?
- Reproduction leads to variation. How?
