The disease caused by a protozoan and spread by an insect is
The two micro-organisms which live in symbiotic association in lichens are
Which of the following reproduces only inside a host cell?
The branchy part of a tree above the stem is known as
The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene per person per day is a minimum of
On which of the following day is World Water Day observed?
If an object is placed at a distance of 0.5 m in front of a plane mirror, the distance between the object and the image formed by the mirror will be
Which of the following can be used to form a real image?
A bus travels 54 km in 90 minutes. The speed of the bus is
Seeds of drumstick and maple are carried to long distances by wind because they possess
Which of the following parts of a plant take part in sexual reproduction?
Choose the correct answer from below.
Aquatic animals like fish excrete their wastes in gaseous form as
In which of the following parts of human body are sweat glands absent?
The absorption of nutrients and exchange of respiratory gases between blood and tissues takes place in
Galvanisation is a process used to prevent the rusting of which of the following?
Which of the following set of substances contain acids?
When the soil is too basic, plants do not grow well in it. To improve its quality what must be added to the soil?
Phenolphthalein is a synthetic indicator and its colours in acidic and basic solutions, respectively are
Turmeric is a natural indicator. On adding its paste to acid and base separately, which colours would be observed
A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile
The rearing of silkworms for obtaining silk is called
Cud is the name given to the food of ruminants which is
The swallowed food moves downwards in the alimentary canal because of
In the absence of which of the following will photosynthesis not occur in leaves?
Organisms which prepare food for themselves using simple naturally available raw materials are referred to as
The method of preparing compost with the help of earthworms is called
Which of the following components of air is present in the largest amount in the atmosphere?
Mountaineers carry oxygen cylinders with them because