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
- The diagram represents gametes P and Q fusing to give cell R.
- Assertion : HIV-AIDS is a bacterial disease. Reason : It spreads through sharing of food and water.
- Assertion : Menstruation is the regular discharge of blood from the thick uterine lining. Reason : Menstruation occurs when egg is..
- Assertion : Vagina is also called as birth canal. Reason : During birth, the baby passes through the vagina.
- (i) Define germination (ii) From the diagram given below identify the incorrectly labelled parts
- The diagram shows the cross-section through the carpel of a flower just before fertilisation
- Name the individual units of floral whorls.
- Write the dual purpose served by urethra in males.
- Ravi took three bread slices and kept them in the following conditions
- (i) Label the following diagram. (ii) Which process is being shown in the diagram
- Assertion : AIDS is an incurabls and a fatal bacterial infection. Reason : It is suppresses the immune system of the body
- Assertion : DNA acts as the information source. Reason : It helps in making different proteins and cellular machinery of the cell.
- Given below are certain adaptations in fruits of certain plants.
- Assertion : Scrotum is present outside the abdominal cavity. Reason : It stores sperms which require a lower temperature
- Draw a neat and labelled diagram showing longitudinal section of a bisexual flower.
- Draw the diagram of a flower and label the four whorls. Write the names of gamete producing organs in the female.
- DNA copies generated will be similar, but may not be completely identical to the original.
- List two reasons for the appearance of variations among the progeny formed by sexual reproduction.
- Draw a neat diagram of fate of pollen after landing on stigma. Also label the following parts.
- Name the parts A, B and C shown in the following diagram and state one function of each.
- Reproduction is essentially a phenomenon that is not for the survival of an individual, but for the stability of a species. Justif..
- (i) Identify whether budding as seen in Hydra is a type of sexual or asexual reproduction. (ii) How is this process different from..
- Write one main difference between asexual and sexual mode of reproduction.
- Give reasons why a woman should avoid frequent pregnancies.
- How does fertilisation take place? Fertilisation occurs once in a month. Comment.
- Some of the fungal hyphae are aerial and bear black blobs.
- Which one is not STD among the following? AIDS, diarrhoea, genital warts, syphilis
- Explain tissue culture technique. In which area this technique is finding its application?
- Define sexual reproduction.
- List six specific characteristics of sexual reproduction.
- Give a few characteristics of asexual reproduction.
- The sperms are tiny bodies that consist of mainly genetic material and a long tail
- Write two points of difference between asexual and sexual type of reproduction.
- When is vegetative propagation used?
- Mention any one disadvantage of producing new plants by vegetative propagation.
- Reproduction is linked to stability of population of a species. Justify the statement
- Explain the term Regeneration as used in relation to reproduction of organisms.
- (i) State any three characteristics of sexual reproduction. (ii) Explain, what happens to the egg once it
- What is meant by pollination? Name and differentiate between the two modes of pollination in flowering plants
- What is placenta? Describe its structure. State its functions in case of pregnant human female.
