Option “2” is correct The endocrine glands are widely distributed throughout the body. The pituitary gland, pineal gland and hypothalamus are located in the skull. The thyroid and parathyroid glands are in the neck, and the thymus gland is in the thoracic (chest) cavity.
362. Microbial degradation of nitrates into atmospheric nitrogen is known as:
Option “3” is correct Denitrification is the biological conversion of nitrate to nitrogen gas, nitric oxide or nitrous oxide. It refers to nitrate reduction by bacterial species such as Pseudomonas and Clostridium, usually in anaerobic conditions that ultimately produces molecular nitrogen (N_2 ). These bacteria use nitrate as an electron acceptor instead of oxygen during respiration.
363. Which among the following is the sweetest sugar?
1. Lacrose
2. Fructose
3. Maltose
4. Glucose
Option “2” is correct There are primarily three types of sugar: glucose, fructose and sucrose. Of the three sugars, fructose is the sweetest and glucose the least sweet, so typically less fructose can be used than table sugar.
Option “1” is correct Photoperiodism is the development responses of plants to the relative lengths of light and dark periods. It affects the vegetative growth as well as the time of flowering and fruiting in plants.
365. 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.
366. Which of the following is not a plant hormone?
Option “4” is correct Thyroxin is an animal hormone.Thyroxine is the main hormone secreted into the bloodstream by the thyroid gland.
367. 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.
368. 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.
369. What is the name of the hormone produced by thymus gland?
1. Thyroxine
2. Auxins
3. Cytokinins
4. Thymosin
Option “4” is correct The thymus gland produces and secretes thymosin, a hormone necessary for T cell development and production. The thymus is special in that, unlike most organs, it is at its largest in children. Once you reach puberty, the thymus starts to slowly shrink and become replaced by fat.
370. Photosynthesis takes place in the presence of chlorophyll and _________.
1. Water
2. Nutrients
3. Carbon-dioxide
4. Sunlight
Option “4” is correct Photosynthesis takes place in the presence of chlorophyll and sunlight.
