Write the functions of the following parts in human female reproductive system:-
(i) Ovary
(ii) Oviduct
(iii) Uterus
Concept: Human Reproductive System
Describe the function of placenta.
Concept: Human Reproductive System
List three distinguishing features, in tabular form, between acquired traits and the inherited traits.
Concept: Evolution
Write the function of the following part of the human eye: Cornea
Concept: Human Eye: Structure of the Eye
Write the function of the following part of the human eye: crystalline lens
Concept: Human Eye: Structure of the Eye
Write the function of the following part of the human eye: ciliary muscles
Concept: Human Eye: Structure of the Eye
Draw the well-labelled diagram of the human excretory system
Concept: Excretion: Substances to Be Eliminated
What is atmospheric refraction? Use this phenomenon to explain the following natural events:
Twinkling of stars
Draw diagrams to illustrate your answers.
Concept: Atmospheric Refraction
List any four methods of contraception used by humans. State in brief two advantages of adopting such preventive methods.
Concept: Human Reproductive System
Explain how the embryo gets nourishment inside the mother’s body.
Concept: Human Reproductive System
A student in viewing under a microscope a permanent slide showing various stages of asexual reproduction by budding in yeast. Draw diagrams of what he observes (in proper sequence)
Concept: Asexual Reproduction in Plant
What is meant by a power of a lens? Define its SI unit.
Concept: Power of a Lens
Principle of Electric motor
Concept: Electric Motor
Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity
Concept: Types of Chemical Change or Chemical Reaction > Decomposition Reactions
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.
Concept: Chemical Equation
What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.
Concept: Types of Chemical Change or Chemical Reaction > Double Displacement Reaction
The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for its formation. List its two uses.
Concept: Salts
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Concept: Extraction of Metals
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
Concept: Extraction of Metals
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
Concept: Physical Properties of Metals
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