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The diagram given below shows an object O and its image I. Without actually drawing the ray diagram, state the following: (i) Type of lens (Converging / Diverging) (ii) Name two optical instruments where such an image is obtained. (iii) List three characteristics of the image formed if this lens is replaced by a concave mirror of focal length ‘f’ and an object is placed at a distance ‘f/2’ in front of the mirror.

(i) Type of lens is Converging Lens (Convex lens) because the image is magnified (larger than the object) and on... View Article

A green stemmed rose plant denoted by GG and a brown stemmed rose plant denoted by gg are allowed to undergo a cross with each other. (a) List your observations regarding (i) Colour of stem in their F1 progeny (ii) Percentage of brown stemmed plants in F2 progeny if F1 plants are self pollinated. (b) Based on the findings of this cross, what conclusion can be drawn? (iii) Ratio of GG and Gg in the F2 progeny.

a) i) Green ii) 25% iii) 1:2 b) The conclusion is that both the gametes are showing it’s expression in the F2... View Article

State the main feature that categorises a given pair of organs as homologous or analogous.

The main feature that categorizes a given pair of organs as homologous or analogous are their basic structure, source of... View Article

Classify the following as homologous or analogous pairs: (i) Broccoli and Cabbage (ii) Ginger and Raddish (iii) Fore limbs of birds and lizard (iv) Wings of a bat and Wings of a bird

(a) (i) Broccoli and Cabbage are homologous in nature as they belong to the same family indicating a common origin.... View Article

List two functions of finger like projections present in the small intestine.

The finger-like projections present in the small intestine are known as villi. Functions Their function is to increase the surface... View Article

State the role played by the following in the process of digestion. (i) Enzyme trypsin (ii) Enzyme lipase

(a) In the process of digestion, (i) Enzyme trypsin: helps in the digestion of protein. (ii) Enzyme lipase: helps in the digestion of... View Article

(a) Write two harmful effects of using plastic bags on the environment. Suggest alternatives to the usage of plastic bags. (b) List any two practices that can be followed to dispose off the waste produced in our homes.

(a) Plastic bags are the type of non-biodegradable wastes which pollutes the environment. Accumulation and burning or destruction of such... View Article

(a) From the following group of organisms create a food chain which is the most advantageous for Human beings in terms of energy. [Hawk, Rat, Cereal Plant, Goat, Snake, Human Being] (b) State the possible disadvantage if the cereal plant is growing in soil rich in pesticides. (c) Construct a food web using the organisms mentioned above.

(a) Cereal plant → Human being As this food chain involves only two organisms and the least number of trophic... View Article

Study the data of the following three categories A, B and C. (i) From the given three categories A, B and C, pick the one which forms Dobereiner’s Triads. (ii) Why did Mendeleev placed elements of category A, B and C in three different groups? (iii) Is Newland law of octaves applicable to all the three categories? Give reason to justify your answer.

(i)Dobereiner stated in his law of triads that the arithmetic mean of the atomic masses of the first and third... View Article

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Latest Posts

State the main feature that categorises a given pair of organs as homologous or analogous.

Classify the following as homologous or analogous pairs: (i) Broccoli and Cabbage (ii) Ginger and Raddish (iii) Fore limbs of birds and lizard (iv) Wings of a bat and Wings of a bird

List two functions of finger like projections present in the small intestine.

State the role played by the following in the process of digestion. (i) Enzyme trypsin (ii) Enzyme lipase

(a) Write two harmful effects of using plastic bags on the environment. Suggest alternatives to the usage of plastic bags. (b) List any two practices that can be followed to dispose off the waste produced in our homes.

Draw a labelled diagram to show the preparation of hydrogen chloride gas in laboratory

Pyuria is the condition of urine containing

Deposition of insoluble crystallised salts within kidney is

_______ is the inflammation of glomerulus in kidneys.

Accumulation of urea in blood is called

Which of the following statements is correct about valves?

The deoxygenated blood from the heart muscles (myocardium) drains into the

Incomplete double circulation is observed in:

Which of the following statements is correct about the circulatory system in animals?

The two chambered heart is observed in

The condition for erythroblastosis foetalis to occur is