Science Question Answer (1 Marks)

Leguminous plants can fix atmospheric nitrogen into nitrogen compounds.

he two common insects which act as carriers of disease-causing micro-organisms (or disease-causing microbes) are housefly and mosquito.

Female Aedes mosquito acts as a carrier of dengue virus.

Certain bacteria and blue green algae present in the soil fix atmospheric nitrogen and convert it into compounds of nitrogen.

Tuberculosis disease spreads by breathing in air containing micro-organisms.

An antibiotic Penicillin was extracted from fungus (mould) by Alexander Fleming in 1929. This antibiotic was made from the fungus called penicillium.

Malaria disease spreads through insect bites.

Viruses are the smallest micro-organisms which reproduce only inside the living cells of other organisms.

Meat and fish are preserved by using common salt.

Cholera disease spreads through infected food or water.

Blue green algae are known as 'biological nitrogen-fixer' as they fix the atmospheric nitrogen.

Alexander Fleming discovered the antibiotic 'Penicillin' in 1929.

Edward Jenner discovered the vaccine for smallpox in 1978.

There are five major groups of micro-organisms. These are: Bacteria, viruses, Protozoa, some fungi and Algae.

The human diseases such as common cold and influenza are caused by viruses.

Protozoa Plasmodium causes malaria disease.

Jams and jellies are preserved by using sugar.

Typhoid and Cholera are caused by bacteria in human beings.

Sodium benzoate and sodium meta bisulphite are common preservatives.

Yeast is used for the large-scale production of alcohol.

Diseases cholera and tuberculosis spread by housefly.

Leguminous plants such as beans and peas can fix nitrogen.

1. Foot and mouth disease is caused by a virus.
2. Anthrax disease is caused by a bacterium.

Several diseases including tuberculosis, smallpox, cholera and hepatitis can be prevented by vaccination.

Diseases athlete’s food and ring worm are caused by fungi.

The human diseases amoebic dysentery and malaria are caused by protozoans.

Streptomycin and erythromycin are two commonly known antibiotics which are made from fungi and bacteria.

Microscope is needed to see the micro-organisms.

Malaria and dengue spread by mosquitoes.

Blue green algae fix the atmospheric nitrogen to enrich soil with nitrogen and hence, increase soil fertility.

The carrier of parasite of malaria is Female Anopheles mosquito.

Vegetables like methi leaves and spinach are preserved by sun-drying method in our homes.

Lactobacillus bacterium is utilized in making curd from milk.

Fish and meat are often preserved by using oil or vinegar.

Female Aedes mosquito carries dengue virus.