Archives

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 something on fire is... 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 metabolically... 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 Brick kilns damage air quality and... 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 Maize is grown in a warm and tropical climate. The optimum temperature for growing maize is between 18 0 c -27°Cin day... 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. In a plant, there will... 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. (b) Chronic disease last for long time... 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 pickles and jams contain... 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 and cross between Indo-Italian... 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 epidermal tissue form a continuous... 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 an exhaustible natural resource, so we have... 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 Seed drill is a modern tool of cultivation, whereas, the other tools in the given list are very traditional and old methods of... 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 extracellular... 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. Carbon monoxide, otherwise... 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 million years ago. Coal... 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 air (water, oxygen and... View Article

During respiration exchange of gases take place in (a) trachea and larynx (b) alveoli of lungs (c) alveoli and throat (d) throat and larynx

(b) Alveoli of lungs During inhalation, oxygen has a higher concentration in the alveoli as compared to the blood and hence it diffuses into... View Article

Soil formation is done by both abiotic and biotic factors. List the names of these factors by classifying them as abiotic and biotic?

The biotic and abiotic factors responsible for soil formation are as follows Abiotic factors in the making of soil - sun, water, wind Biotic... View Article

Incomplete combustion of fuel such as petrol and diesel gives (a) nitrogen oxide (b) sulphur dioxide (c) carbon monoxide (d) carbon dioxide

(c) carbon monoxide During complete combustion carbon and hydrogen combine with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O).... View Article

Unscramble the jumbled words given below, related to synthetic materials. (a) anory (b) lopmery (c) relyteen (d) laspict (e) yespolter (f) felton

(a) Rayon (b) Polymer (c) Terylene (d) plastic (e) Polyester (f) Teflon Rayon is a fabric made of semi-synthetic fibre. This makes it a soft and... View Article

M	T	W	T	F	S	S
						1
2	3	4	5	6	7	8
9	10	11	12	13	14	15
16	17	18	19	20	21	22
23	24	25	26	27	28	29
30	31