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Becoming exposed to or infected with an infectious microbe does not necessarily mean developing a noticeable disease. Explain.

Our immune system fight for the pathogenic microbes in our body. Our body have cells that are fighting off microbes.... View Article

Amoeba acquires its food through a process, termed (a) exocytosis (b) endocytosis (c) plasmolysis (d) exocytosis and endocytosis both

b) Endocytosis Endocytosis is the process of internalisation of substances into the cell. The substance gets surrounded by the cell... View Article

The substance expected to have the highest ignition temperature out of the following is (a) kerosene (b) petrol (c) coal (d) alcohol

a) Coal Ignition temperature is the temperature at which a substance starts burning. Coal requires a very high initial temperature... View Article

In a neuron, conversion of electrical signal to a chemical signal occurs at/in (a) cell body (b) axonal end (c) dendritic end (d) axon

b) Axonal ends Explanation The swollen end of a telodendron is known as the axon terminal which joins the Dendron... View Article

The substances, which vapourise during burning, gives flame. (True or False). Also write the false statements in their correct form.

True. The substances, which vapourise during burning, give flame. A hot, glowing body of ignited gas that is generated by... View Article

Which of the following does not lose their nucleus at maturity? (a) Companion cells (b) Red blood cells (c) Vessel (d) Sieve tube cells

a) Companion cells Companion cells are present along the sieve tube are connected to them via plasmodesmata. These cells are... View Article

A brick kiln emits a lot of smoke and other harmful gases causing air pollution. State true or false. Correct if wrong statement.

True. A brick kiln emits a lot of smoke and other harmful gases causing air pollution- Correct statement Explanation Brick... View Article

Which one of the following condition is not essential to grow maize? (a) High temperature (c) Low temperature (b) Humidity (d) Rainfall

(c)Low temperature Explanation Maize is grown in a warm and tropical climate. The optimum temperature for growing maize is between... View Article

Leaves of a healthy potted plant were coated with vaseline. Will this plant remain healthy for long? Give reasons for your answer.

The Leaves of a healthy plant coated with Vaseline would not stay healthy because Vaseline coating will block the stomata.... View Article

Give two examples for each of the following (a) Acute diseases (b) Chronic diseases (c) Infectious diseases (d) Non-infectious diseases

(a) Acute disease cast for short period of time and do not cause long term effect, e.g., cold and cough.... View Article

Raw vegetables and fruits are kept in refrigerators whereas jams and pickles can be kept outside. Give reasons for the following.

The raw vegetables and fruits are kept in the refrigerators whereas the pickles and jams are kept outside because the... View Article

An Italian bee variety A. mellifera has been introduced in India for honey production. Write about its merits over other varieties.

A. Mellifera or European’ bee is very common all over the Europe. Its Italian variety has been introduced in India... View Article

In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is (a) ovum (b) embryo (c) foetus (d) zygote

C) Blastocyst After fertilization, a single-celled structure called the zygote is formed. The zygote undergoes a series of cell divisions,... View Article

Which is not a function of epidermis? (a) Protection from adverse condition (b) Gaseous exchange (c) Conduction of water (d) Transpiration

c) Conduction of water Epidermis is present on the outer surface of the entire plant body. The cells of the... View Article

Coal reserves are said to be enough to last for another hundred years. Do you think we need to worry in such a case? Why or why not?

coal is one of the important fossil fuels and it takes millions of years to be formed. This is also... View Article

Pick out the odd one from the following words given in the box and give the reason for it. Plough, Seed Drill, Hoe, Chain Pump, Sickle

Seed drill Explanation Seed drill is a modern tool of cultivation, whereas, the other tools in the given list are... View Article

Which of the following cells is found in the cartilaginous tissue of the body? (a) Mast cells (b) Basophils (c) Osteocytes (d) Chondrocytes

d) Chondrocytes Chondrocytes are the cells making up the cartilage. They are pivotal to synthesize cartilage matrix and sustain the... View Article

Carbon monoxide is produced by complete burning of fuels such as coal, petrol, diesel. State true or false. Correct if wrong statement.

True. Correct statement – Carbon monoxide is produced by incomplete burning of fuels such as coal, petrol, diesel. Explanation Carbon... View Article

Coal is formed from the remains of (a) vegetation only (b) animals only (c) both vegetation and animals (d) neither vegetation nor animals

(a)Vegetation only Coal is formed by the decomposition of large land plants and trees buried under the earth about 300... View Article

Paheli bought a statue made of copper. To her surprise, it acquired a dull green coating after a couple of months. Explain the reason.

The green material is a mixture of copper hydroxide and copper carbonate formed due to reaction of copper with moist... View Article

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