431. Minamata disease is caused by pollution of water by:
1. Lead
2. Tin
3. Methyl Isocyanate
4. Mercury
Option “4” is correct Minamata disease is a neurological syndrome caused by severe mercury poisoning.
432. Anaemia is caused because of deficiency of which of the following?
1. Cobalt
2. Iron
3. Sodium
4. Calcium
Option “2” is correct Anemia is a condition in which person don’t have enough healthy red blood cells to carry adequate oxygen to the body’s tissues. Iron deficiency anemia is caused by a shortage of iron in body. Bone marrow needs iron to make hemoglobin. Without adequate iron, body can’t produce enough hemoglobin for red blood cells.
433. Azadirachata indica is the scientific name of –
1. Neem
2. Teak
3. Silver Oak
4. Tulsi
Option “1” is correct
Azadirachta indica, commonly known as neem, nimtree or Indian lilac, is a tree in the mahogany family Meliaceae.
Option “1” is correct Octopus belongs to the phylum Mollusca.
435. Medulla oblongata is a part of which of the following?
1. Heart
2. Brain
3. Lungs
4. Stomach
Option “2” is correct The medulla oblongata helps regulate breathing, heart and blood vessel function, digestion, sneezing, and swallowing. This part of the brain is a center for respiration and circulation.
436. Photosynthesis in plants takes place in –
1. Stem
2. Leaves
3. Roots
4. Flower
Option “2” is correct Photosynthesis is the process by which leaves absorb light and carbon dioxide to produce carbohydrate (food) for plants to grow. The sunlight can get to the chloroplasts in the cells.
Option “4” is correct Hydralazine is used to cure high blood pressure (hypertension).
438. The beetroot is the _________ portion of the beet plant.
1. Tap root
2. Adventitious
3. Bulb of the stem
4. Rhizome
Option “1” is correct The beetroot is the taproot portion of the beet plant.
439. What is the basic unit of heredity?
1. DNA
2. RNA
3. Chromosome
4. Gene
Option “4” is correct A gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins.
440. Which of the following is a structural and functional unit of kidneys?
Option “4” is correct A nephron is the structural and functional unit of the kidney. A nephron is used separate to water, ions and small molecules from the blood, filter out wastes and toxins, and return needed molecules to the blood.
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