When sodium hydroxide is added to ferric chloride solution, a reddish-brown precipitate is formed. The precipitate is separated from the mixture by the process of

A plant is grown in bright sunlight. After a few hours, a leaf of the plant is plucked and treated with iodine solution and it turns black. When a section of this leaf is made and observed under microscope, _________ will be seen as stained blue-black.

These are membrane bound vacuolar organelles discovered by de Duve. They mostly occur in animal cells, but they have also been reported in plant cells. They are concerned with the waste disposal system of the cell. The cell organelles being referred in the above passage are

The walls of cork cells are thickened by the deposition of an organic substance, which makes these cells impermeable to water and gases. This substance is called

The animal in which cells are properly arranged into tissues and organs are called

These organisms do not posses a well defined nucleus or organelles, nor do they show multicellular body designs. Some of them have cell walls while others do not. Which of the following kingdoms constitutes such organisms?

_________ is the characteristic of a musical sound by which a loud sound can be distinguished from a faint sound.

The virus infected cells release special chemicals that hinder the infection of neighbouring cells. These chemicals are called

Louis Pasteur developed a vaccine against which of the following diseases?

The roofs and walls of the auditorium are generally covered with sound absorbent materials to reduce the

Which of the following may not occur by wind?

Which of the following tissues primarily serves as a food storage tissue and also provides support to the stem of herbaceous plants?

Less appearance of lichens is observed on the sides of trees facing the roads as compared to the ones away from the roads. This can be explained as lichens are sensitive to

In an experiment, iron filling and sulphur powder are mixed and heated strongly till they become red hot. On heating, a substance containing both iron and sulphur was formed. What is this substance?

It is a water-borne disease, whose symptoms often appear 10 to 14 days after the infection and was cured earlier by taking a chloramphenicol drug. Identify the disease.