Write the functions of the following parts in human female reproductive system:-
(i) Ovary
(ii) Oviduct
(iii) Uterus
Concept: Human Reproductive System
List three distinguishing features, in tabular form, between acquired traits and the inherited traits.
Concept: Evolution - Acquired and Inherited Traits
Describe the function of placenta.
Concept: Human Reproductive System
Write the function of the following part of the human eye: Cornea
Concept: Concept of Human Eye
Write the function of the following part of the human eye: crystalline lens
Concept: Concept of Human Eye
Write the function of the following part of the human eye: ciliary muscles
Concept: Concept of Human 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: Reproduction in Plant > Modes of Reproduction Used by Single Organisms - Budding
What is meant by a power of a lens? Define its SI unit.
Concept: Refraction at Spherical Surfaces and by Lenses > Power of a Lens
Principle of Electric motor
Concept: Electric Motor
A compound 'X' on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound 'Y'. 'X' also reacts with sodium metal to evolve a colourless gas 'Z'. Identify 'X', 'Y' and 'Z'. Write the equation of the chemical reaction of formation of 'Y' and also write the role of sulphuric acid in the reaction.
Concept: Versatile Nature of Carbon > Saturated and Unsaturated Carbon Compounds
Why are most carbon compounds poor conductors of electricity?
Concept: Bonding in Carbon - Covalent Bond
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 from Ore
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 from Ore
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: Chemical Properties of Metals: Reactivity Series
The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation or all the three attempts.
Concept: Dobereiner’s Triads
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
Concept: The Modern Periodic Table
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