Why do some children fall ill more frequently than others living in the same locality?
Frequency of falling ill depends on the strength of the body’s immune system to fight common pathogens. Due to poor... View Article
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Differentiate between voluntary and involuntary muscles. Give one example of each type.
Voluntary Muscles Involuntary Muscles Cylindrical, long, and unbranched shaped muscles. Spindle-shaped, small muscles. These muscles are multinucleated. These muscles are... View Article
Hens and frogs are both oviparous exhibiting different types of fertilisation. Explain.
Hens are oviparous, in which internal fertilisation takes place. The fertilised egg develops into an embryo inside the body. Frogs... View Article
A chemical process in which a substance reacts with oxygen to give off heat is called __________.
Combustion Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat. The original... View Article
The substance that does not burn with flame is (a) LPG (b) camphor (c) dry grass (d) charcoal
d) Charcoal When LPG, or dry grass, or camphor are burnt, they vaporize, and thus a flame is generated. But,... View Article
Why should we avoid standing close to a tuberculosis patient while he/she is coughing?
Tuberculosis is an air-borne disease. A patient who is affected with this disease may transfer the bacteria which are known... View Article
Draw a well-labelled diagram of a eukaryotic nucleus. How is it different from nucleoid?
Nucleus Nucleoid A membrane-bound organelle in the cytoplasm of eukaryotes. A particular area in the cytoplasm of eukaryotes. Contains more... View Article
___ is the change of solid state directly to vapour state without going through the ___state.
Sublimation is the transition of an object from solid-state to vapour state without passing through the intermediate liquid state. Explanation... View Article
The eggs of frogs do not have shells for protection, yet they are safe in the water. How?
Frog’s eggs are without any external covering or shell, but a layer of jelly hold the eggs together, thus providing... View Article
Which one of the following is not a viral disease? (a) Dengue (b) AIDS (c) Typhoid (d) Influenza
c)Typhoid Explanation Typhoid is an infectious bacterial disease that mainly spreads through contaminated food or water. It can also spread... View Article
The book Systema Naturae was written by (a) Linnaeus (b) Haeckel (c) Whittaker (d) Robert Brown
(a) Linnaeus Explanation The book ‘Systema Naturae’ was written by Carolus Linnaeus in 1735. The book marked the beginning of... View Article
It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain.
The green leaves have chlorophyll and moisture will be present in them. This moisture does not allow them to catch... View Article
Flexibility in plants is due to (a) collenchyma (b) sclerenchyma (c) parenchyma (d) chlorenchyma
(a) collenchyma They are known to render mechanical support to plants by protecting the delicate inner structure of plants They have... View Article
The amount of heat energy produced on complete combustion of 1kg of a fuel is called its __________
The amount of heat energy produced on complete combustion of 1 kg of a fuel is called its Calorific value.... View Article
Posture and balance of the body is controlled by (a) cerebrum (b) cerebellum (c) medulla (d) pons
b) Cerebellum Explanation Cerebellum serves to coordinate the voluntary movements of skeletal muscles as well as posture, balance and equilibrium.... View Article
Farming without the use of chemicals as fertilizers, herbicides and pesticides is known as ______.
Farming without the use of chemicals as fertilizers, herbicides and pesticides is known as organic farming. Explanation Organic farming can... View Article
Which bacterium causes peptic ulcers? Who discovered the above pathogen for the first time?
Peptic ulcer disease (PUD) is a break in the lining of the stomach, first part of the small intestine or... View Article
Organelle without a cell membrane is (a) ribosome (b) golgi apparatus (c) chloroplast (d) nucleus
a) Ribosome Ribosome is a circular particle attached to the double membrane Endoplasmic reticulum. All the others are double membrane... View Article
Give two examples each for a solid, liquid and gaseous fuel along with some important uses.
Any substance which upon combustion produces a usable amount of energy is known as fuel. For Solid Fuels which are... View Article
Which of the following is not a combustible substance? (a) camphor (b) glass (c) straw (d) alcohol
b) Glass A substance that does not react with oxygen in air and does not produce heat is known as... View Article
