Answer:- Ans. A Explanation: There can be many reasons for an overactive thyroid. It is often caused by an autoimmune disease of the thyroid tissue, called Graves disease (or Basedow’s disease).

Answer:- Ans. B Explanation: A condition called Hashimoto’s thyroiditis, a chronic inflammation of the thyroid, can also lead to under activity. The use of certain medications can also affect the production of thyroid hormones.

Answer:- Ans. C Explanation: The hypothalamus and the pituitary gland are the main controls that regulate the actual thyroid’s activity.

Answer:- Ans. B Explanation: In hyperthyroidism, patients have low TSH levels. From the above quiz we have seen what are the functions of thyroid gland, how it affects health and diseases related with it.

Answer:- Ans. C Explanation: Digestion of food starts as soon as we put food in our mouth. The mouth cavity contains teeth, tongue and salivary glands. The teeth cut the food into small pieces, chew and grind it. The teeth help in physical digestion. The salivary glands help in chemical digestion by secreting enzymes.

Answer:- Ans. B Explanation: In parasitic nutrition organism derives its food from the body of another living organism called host without killing it. Parasitic mode of nutrition is observed in several fungi, bacteria, few plants like Cuscuta and some animals like Plasmodium and round worms. Plasmodium causes malarial disease.

Answer:- Ans. C Explanation: The salivary glands present in mouth secrete salivary amylase enzyme which digests the starch present in food into sugar. Digestion of starch or carbohydrate starts in mouth itself. Therefore, amylase is the first enzyme that helps in the process of digestion.

Answer:- Ans. C Explanation: The process of releasing energy from food is called respiration. The energy is stored in the form of ATP (Adenosine tri phosphate) in the body cells which is used for various purposes like contraction of muscles, conduction of nerve impulses, synthesis of proteins and many other activities related to the functioning of cells. Therefore, ATP is known as the energy currency of cells.

Answer:- Ans. A Explanation: In woody stems of plants or trees have lenticels for the exchange of respiratory gases.

Answer:- Ans. B Explanation: Lizard has three-chambered heart. Except crocodiles all the reptiles and have three-chambered heart. Crocodiles have four-chambered heart. Pigeons have four-chambered heart. Fish have two-chambered heart. Lion have four-chambered heart. Birds and mammals have four chambered heart i.e. 2 atria and 2 ventricles. Three-chambered consists of 2 atria and 1 ventricle and two-chambered heart consists of 1 atria and 1 ventricle.

Answer:- Ans. A Explanation: Arteries carries blood from the heart to the body organs and veins carries blood from the body organs back to the heart.

Answer:- Ans B Explanation: Plants have two tissues that help in transportation. Xylem transports water and solutes from the roots to the leaves while phloem transports food from the leaves to the rest of the plant.

Answer:- Ans. C Explanation: After wound or cut in a body it starts to bleed. But within few seconds or minutes blood cells start to clump together and clot, preventing the further blood loss. These clots are created by a type of blood cell called platelet.

Answer:- Ans. B Explanation: The expansion of an artery each time the blood is forced into it is called pulse. The pulse rate of an adult person while resting is 70 to 72 per minute. From the above quiz we have seen various life processes that take place in an organism.