1. Hot, dry and windy condition
2. Hot, damp and windy condition
3. Cool, damp and windy condition
4. Cool, dry and still condition
Option “1” is correct. Conditions which increase the rate of evaporation also increase the rate of transpiration. Transpiration is more rapid in hot, dry and windy conditions than it is in still or humid conditions.
192. What is the Kyoto Protocol?
1. It is an agreement among countries to take steps for reducing acid rain
2. It is an agreement among countries to take steps for planting trees to control pollution
3. It is an agreement among countries to start using nuclear energy
4. It is an agreement among countries to take steps for reducing greenhouse gases emission
Option “4” is correct. The Kyoto Protocol is an international treaty, which extends the 1992 United Nations Framework Convention on Climate Change (UNFCCC) that commits State Parties to reduce greenhouse gases emissions.
193. Animal protein is called first class protein because it is –
1. easily digestible
2. delicious in taste
3. cheaper in the market
4. rich in essential amino acids
Option “4” is correct. Proteins from animals are called ‘first class’ proteins – they provide all the essential amino acids, including those that the body can’t make. Proteins from plants are ‘second class’ proteins.
194. Which of the following fuels causes minimum environmental pollution?
1. Kerosene
2. Diesel
3. Coal
4. Hydrogen
Option “4” is correct. Most of environmental (air) pollution results from the burning of fossil fuels, such as coal, oil, natural gas, and gasoline to produce electricity and power. All these produce harmful CO2 or its variants. On the contrary, when hydrogen burns in air, it produces nothing but water vapor.
195. Enzymes are –
1. Proteins
2. Minerals
3. Oils
4. Fatty acids
Option “1” is correct. Enzymes are biological molecules (proteins) that act as catalysts and help complex reactions occur everywhere in life. They speed up reactions by providing an alternative reaction pathway of lower activation energy.
196. Which of the following disease is caused by female Anopheles mosquito?
1. Chicken Pox
2. Malaria
3. Black Fever
4. Cholera
Option “2” is correct. Only certain species of mosquitoes of the Anopheles genus—and only females of those species—can transmit malaria. Malaria is caused by a one-celled parasite called a Plasmodium. Female Anopheles mosquitoes pick up the parasite from infected people when they bite to obtain blood needed to nurture their eggs.
197. Which part of the plant gives us saffron?
1. Roots
2. Petals
3. Stem
4. Stigma
Option “4” is correct. Saffron is a spice derived from the flower of Crocus sativus, commonly known as the “saffroncrocus”. The vivid crimson stigmas and styles, called threads, are collected and dried to be used mainly as a seasoning and colouring agent in food.
198. Nephron is related to which of the following system of human body?
1. Circulatory system
2. Excretory system
3. Reproductive system
4. Respiratory system
Option “2” is correct. A nephron is the basic structural and functional unit of the kidney which is part of excretory system. Its chief function is to regulate the concentration of water and soluble substances like sodium salts by filtering the blood, reabsorbing what is needed and excreting the rest as urine.
199. Which Vitamin is obtained from Sun rays?
1. Vitamin A
2. Vitamin C
3. Vitamin K
4. Vitamin D
Option “4” is correct. Vitamin D is produced by the body in response to skin being exposed to sunlight. Vitamin D is essential for strong bones, because it helps the body use calcium from the diet.
200. Which of the following is the largest mammal?
1. Whale
2. Rhinoceros
3. Elephant
4. Human
Option “1” is correct. Blue Whale is the largest known mammal
