Consider the following statements about the ‘properties of ethanol’:
1. Ethanol is insoluble in water.
2. Consumption of small quantities of dilute ethanol causes drunkenness.
3. Ethanol can be blended with diesel.
4. Ethanol is used as a solvent in many medicines.
Which of the statements given above are correct?
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Consider the following statements about Carbon dioxide (CO2):
1. Volcanic eruptions are a natural source of Carbon dioxide in the atmosphere.
2. Carbon dioxide is confined only to the tropospheric layer of the atmosphere.
3. Excess of Carbon dioxide in the air is removed by green plants by respiration.
Which of the statements given above is/are correct?
Read the following statements carefully in the context of ‘particulate pollutants’?
1. Smoke particulates consist of gaseous or mixture of gaseous and liquid particles formed during combustion of organic matter.
2. Dust is composed of fine solid particles produced during crushing, grinding and attribution of solid materials.
3. Mists are produced by particles of spray liquids and by condensation of vapours in air.
4. Fumes are generally obtained by the condensation of vapours during sublimation, and boiling.
Which of the statements given above are correct?
Desirable characteristics of a crop variety helps in easy adoption of that crop by the farmers. In this context, consider the following statements:
1. Incorporating desirable characters into crop varieties can be done through fertilisation.
2. Dwarfness is desired in cereals, so that less nutrients are consumed by these crops.
3. Hybridisation refers to crossing between genetically similar plants.
Which of the statement(s) given above is/are correct?
A lemon kept in water in a glass tumbler appears to be bigger than its actual size, when viewed from the sides. This is because of which of the following reasons:
Read the following statements carefully and select the correct answer from the code given below:
1. Dugong (Dugong dugon) is an herbivorous mammal.
2. Dugongs are listed as Critically endangered on the IUCN Red List of Threatened Species.
3. Recently, an announcement was made by Tamil Nadu State government for the set-up of Dugong conservation reserve.
Which of the statements given above is/are correct?
Fertilizers are commercially produced plant nutrients. In this context, consider the following statements:
1. Fertilizers get washed away due to excessive irrigation.
2. Micro-organisms in the soil are harmed by the continuous use of fertilizers.
3. Fertilizers supply nitrogen, phosphorus and sodium to the soil.
Select the correct answer using the code given below:
Consider the following statements:
1. Some substances like carbon dioxide or oxygen can move across the cell membrane by a process called Osmosis.
2. In the cell’s external environment, the concentration of carbon dioxide is low as compared to that inside the cell.
Which of the statement(s) given above is/are correct?
The ‘scattering of light’ is responsible for which of the following phenomena in nature?
1. Tyndall effect.
2. Colour of water in deep sea.
3. Blue colour of the sky.
4. Rainbow formation.
Select the correct answer using the code given below.
The most common nutrients causing eutrophication are:
With reference to ‘blood’ present in the human body, consider the following statements:
1. It carries oxygen and food to all the cells in human body.
2. It collects wastes from the cells for disposal.
3. It is a type of connective tissue.
Which of the statements given above is/are correct?