Latest Posts

Some words (underlined) in the following sentences are jumbled up. Write them in their correct form. (a) Seldie is a combustible substance. (b) Slags is a non-combustible material. (c) Chittsmack does not burn by itself. (d) Some substances on combustion produce thea and mafel. (e) The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its Aricolci uelav.

(a) Diesel is a combustible substance. When a substance ;can burn in air and produce heat and light is known... View Article

Find out the correct sentence 1) Hybridisation means crossing between genetically dissimilar plants 2) Cross between two varieties is called as inter specific hybridisation 3) Introducing genes of desired character into a plant gives genetically modified crop 4) Cross between plants of two species is called as inter varietal hybridisation (a) (i) and (iii) (b) (ii) and (iv) (c) (ii) and (iii) (d) (iii) and (iv)

A. (i) and (iii) Explanation The cross performed between two plants belonging to different species (having different characters) is referred... View Article

A long tree has several branches. The tissue that helps in the sideways conduction of water in the branches is (a) collenchyma (b) xylem parenchyma (c) parenchyma (d) xylem vessels

b) Xylem parenchyma Xylem parenchyma is an element of complex tissue called “Xylem”. Parenchyma cells of the xylem are mainly... View Article

Imagine that all the exhaustible natural resources are exhausted by human activities. Do you think the survival of living beings would be possible.? If yes, why?, If not, why not?

If natural resources are not available, then the survival of the human beings would be impossible. Fossil fuels are an... View Article

While returning from the school, Boojho ate chaat from a street hawker. When he reached home, he felt ill and complained of stomach ache and fell ill. What could be the reason?

The probable reason is that the chaat was contaminated by pathogenic microbes clue to unhygienic conditions near the shop or... View Article

To solve the food problem of the country, which among the following is necessary? (a) Increased production and storage of food grains (b) Easy access of people to the food grain (c) People should have money to purchase the grains (d) All of the above

All of the above Explanation As the population is growing rapidly, we require more food to feed the population. Agricultural... View Article

Poultry farming is undertaken to raise following (i) Egg production (ii) Feather production (iii) Chicken meat (iv) Milk production (a) (i) and (iii) (b) (i) and (ii) (c) (ii) and (iii) (d) (iii) and (iv)

a) (i) and (iii) Explanation Poultry farming refers to the rearing of domesticated fowl (birds) for their meat and eggs.... View Article

If there were no atmosphere around the earth, the temperature of the earth will (a) increase (b) go on decreasing (c) increase during day and decrease during night (d) be unaffected

c) Increase during day and decrease during night Explanation Atmosphere is a protective layer of gases that shelters all life... View Article

A lot of dry leaves are collected in a school garden and are burnt every day. Do you think that it is right to do so? If not, what should be done to dispose off the dry leaves?

It is not right to burn dry leaves as it causes air pollution. The right way to dispose off the... View Article

Match the following A and B (A) – (B) (a) Smooth endoplasmic reticulum – (i) Amoeba (b) Lysosome – (ii) Nucleus (c) Nucleoid – (iii) Bacteria (d) Food vacuoles – (iv) Detoxification (e) Chromatin material – (v) Suicidal bag and nucleolus

Column-I Column-II A. Smooth endoplasmic 4. Detoxification B. Lysosome 5. Suicidal bag C. Nucleoid 3. Bacteria D. Food vacuoles 1.... View Article

Majority of cells cannot be seen directly with our naked eyes because: (a) organisms are generally unicellular (b) cells are microscopic (c) cells are present only inside the body (d) cells are grouped into tissues

b) Cells are microscopic. The majority of the cells cannot be seen directly with our naked eyes because cells are... View Article

If a person’s clothes catch fire, the best way to extinguish the fire is to: (a) throw water on the clothes. (b) use the fire extinguisher. (c) cover the person with a woollen blanket. (d) cover the person with a polythene sheet.

(c) cover the person with a woolen blanket. If a person’s clothes catch fire, the best way to extinguish the... View Article

Select the incorrect sentence (a) Blood has matrix containing proteins, salts and hormones (b) Two bones are connected with ligament (c) Tendons are non-fibrous tissue and fragile (d) Cartilage is a form of connective tissue

(c) Tendons are non-fibrous tissue and fragile A tendon is a tough fibrous connective tissue that connects muscle to bone.... View Article

Select the correct statement (a) Heterotrophs do not synthesise their own food (b) Heterotrophs utilise solar energy for photosynthesis (c) Heterotrophs synthesise their own food (d) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates

(a) Heterotrophs do not synthesize their own food Explanation Heterotrophs are those organisms which cannot make their own food from... View Article

A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.) would correctly represent the change in its temperature as a function of time.

Graph (a) is the right answer because water will cool initially until its temperature reaches 0 °C. After reaching the... View Article

While doing work and running, you move your organs like hands, legs etc. Which among the following is correct?

(a) Smooth muscles contract and pull the ligament to move the bones (b) Smooth muscles contract and pull the tendons... View Article

The shape of guard cells changes due to change in the (a) protein composition of cells (b) temperature of cells (c) amount of water in cells (d) position of the nucleus in the cells

(c) amount of water in cells Explanation Guard cells are cells surrounding each stroma. They help to regulate the rate... View Article

Beera wants to practice crop rotation in his field. Suggest a Rabi crop and a Kharif crop which will replenish his field with nitrogen. Which crop replenishes nitrogen and why?

Rabi crops are pea, wheat, mustard whereas kharif crops are paddy, maize, soybean. These crops require different climatic conditions and... View Article

An increase in carbon dioxide content in the atmosphere would not cause (a) more heat to be retained by the environment (b) increase in photosynthesis in plants (c) global warming (d) abundance of desert plants

d) Abundance of desert plants Explanation When the carbon dioxide is increasing it increases the earth temperature. The increase in... View Article

Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from outside. It may be due to: (a) proper combustion of fuel. (b) improper cooking of potato curry. (c) improper combustion of the fuel. (d) burning of the copper vessel.

(c) improper combustion of the fuel. A reaction or process which entails only partial burning of a fuel. This may... View Article

«
1
…
1,778
1,779
1,780
1,781
1,782
…
5,472
»