221. Spiders are different from insects because they have –

1. Six legs
2. Eight legs
3. Ten legs
4. Twelve legs

Option “2” is correct
Spiders belong to a group of animals called “arachnids”. Arachnids are a creature with two body segments, eight legs, no wings or antennae. Rest three options are insects. They have six legs, while spider has eight legs. Thus spider is not an insect.
222. Sickle-cell anemia is a disease caused due to the abnormality in-

1. White blood cells
2. Red blood cells
3. Thrombocytes
4. Blood plasma composition

Option “2” is correct
Sickle cell anemia is an inherited blood disorder that causes chronic anemia, periodic episodes of pain, and other complications. In sickle cell anemia, the red blood cells become rigid and shaped like crescents, or sickles, rather than being flexible and round. This change in shape prevents red blood cells from getting into small blood vessels. As a result, the tissues do not get enough oxygen. Lack of oxygen can cause pain and damage in the arms, legs, and organs (e.g., spleen, kidney, brain).
223. Which one of the following vitamins is responsible for blood clotting?

1. C
2. K
3. E
4. D

Option “2” is correct
Blood is a fluid connective tissue which coagulates in few minutes after ejecting from the body which called as blood clots. In process of blood clotting Vitamin K are involved.
224. Match List I with List II and select the correct answer from the code given below the lists:

1. A
2. B
3. C
4. D

Option “3” is correct
Nightblindness is caused due to deficiency of vitamin A, Rickets caused due to deficiency of vitamin D, Scurvy is caused by deficiency of vitamin C and Beri-Beri is result of deficiency of Vitamin B1.
225. Itai-Itai disease is caused by chronic poisoning of-

1. Mercury
2. Nickel
3. Cadmium
4. Lead

Option “3” is correct
Itai-Itai disease is caused by prolonged poisoning of cadmium. The first documented occurrence of mass cadmium poisoning in the world occurred in 1950 in Toyama Prefecture in Japan. However, for the first time, the disease was reported in 1912.
226. Which of the following diseases, antibodies cannot cure?

1. Leprosy
2. Tetanus
3. Measles
4. Cholera

Option “3” is correct
Measles is a highly contagious respiratory infection which is caused by a virus. It can not be cured by antibiotics whereas leprosy, Tetanus and Cholera can be cured by antibiotics.
227. Which one of the following is the richest source of protein?

1. Rice
2. Groundnut
3. Apple
4. None of the above

Option “2” is correct
As per the question, groundnut is the richest source of protein. Rice is the best source of carbohydrate and apple is known for the richness of antioxidants.
228. The scientific study of insects is known as:

1. Ichthyology
2. Entomology
3. Parasitology
4. Malacology

Option “2” is correct
Ichthyology – Study of fish.
Entomology – Scientific study of insects.
Parasitology – Study of parasitic organisms.
Malacology – Study of molluscs.
229. What is hydroponics?

1. Plant without soil enrichment
2. Grafting plant
3. Study of vegetables
4. Soil conservation

Option “1” is correct
Hydroponics is a subset of hydroculture and is a method of growing plant using mineral nutrients solutions in water without soil.
230. The source of Vitamin ‘D’ is-

1. Lemon
2. Sun rays
3. Orange
4. Cashewnut

Option “2” is correct
The source of Vitamin D is sun rays. In fact, vitamin D is synthesized in our dermal cell by sun rays which is released in the blood. Besides of sun ray, Vitamin D is obtained from butter, the yolk of egg, liver, and kidney, etc. Rickets in children and osteomalacia in adults occur due to deficiency of Vitamin D. Together with Calcium deficiency of vitamin D causes osteoporosis in older adults.
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