Weeds are unwanted plants in a cultivated field. In this context, consider the following statements:
1. The weeds compete for food, space and light.
2. Weeds are responsible for affecting the growth of the crop.
3. Timely sowing of crops and crop rotation help in weed control.
Which of the statement(s) given above is/are correct?
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Which of the following are the properties of the image formed by a plane mirror?
1. The image is always real and erect.
2. The size of the image is equal to that of the object.
3. The image formed is as far behind the mirror as the object is in front of it.
4. The image is laterally inverted.
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The immune system is a complex network of cells known as immune cells that contains lymphocytes. In this context, consider the following statements:
1. Lymphocytes are red blood cells and one of the body's main types of immune cells.
2. Lymphocytes are made in the bone marrow and found in the blood and lymph tissue.
Which of the statements given above is/are correct?
Consider the following statements about the ‘fuel obtained from plastic waste’:
1. It has low octane rating.
2. Lead content is absent in it.
3. It is known as green fuel.
Which of the statements given above is/are correct?
Manure contains large quantities of organic matter and also supplies small quantities of nutrients to the soil. In this context, consider the following statements:
1. The organic matter in manure helps in improving the soil structure.
2. It increases the water holding capacity in sandy soils.
3. It causes water logging in clayey soils.
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When light enter the human eye, it passes through the different parts of the eye. In this context arrange the following in the correct sequence:
Fodder crops are raised as food for the livestock. Which among the following is/are fodder crops?
1. Sudan Grass
2. Oats
3. Wheat
4. Berseem
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Vaccines are now available for preventing a whole range of infectious diseases. Which among the following infectious diseases are preventable by the use of vaccine?
1. Polio
2. Measles
3. Whooping cough
4. Human Papilloma Virus (HPV)
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Consider the following statements about ‘rainbow’:
1. It is caused by dispersion of sunlight by tiny water droplets present in the atmosphere.
2. A rainbow is always formed in a direction opposite to that of the Sun.
Which of the statements given above is/are correct?
Which of the following diseases and their causative agents is NOT correctly matched?
Disease | Causative Agent |
1. Ringworms | Fungi |
2. Amoebiasis | Protozoan |
3. Plague | Bacterium |
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Match the following pairs with reference to common air pollutants and its effect/impact on plants and animals:
Pollutant | Associated Effect |
1. Sulphur dioxide | A. Aging in plants. |
2. Oxides of nitrogen | B. Reduces oxygen carrying capacity of blood. |
3. Hydrocarbons | C. Red haze in the traffic. |
4. Carbon monoxide | D. Stiffness of flower buds. |
Select the correct answer using the code given below.