Every question from this NCERT chapter, with a detailed explanation.
With reference to the role of hormones in the life history of insects and frogs, consider the following statements: 1. The change from larva to adult is called metamorphosis. 2. In frogs, metamorphosis is controlled by the hormone insulin. 3. Thyroxine production requires the presence of iodine in the water. Which of the statements given above is/are correct?
Consider the following statements regarding the nutritional needs of adolescents: 1. A balanced diet consists exclusively of proteins and vitamins. 2. Iron is essential for adolescents because it builds blood. 3. Chips and packed snacks have high energy but limited nutritional value compared to regular meals. Which of the statements given above is/are correct?
With reference to HIV/AIDS, consider the following statements: 1. It is caused by a virus. 2. It can be transmitted from an infected mother to an infant through milk. 3. It can be transmitted by sharing syringes used for injecting drugs. 4. It can be transmitted through sexual contact with an infected person. Which of the statements given above are correct?
Consider the following statements regarding the Pituitary gland: 1. It is located at the base of the brain. 2. It secretes insulin necessary for sugar metabolism. 3. It functions independently and does not influence other endocrine glands. Which of the statements given above is/are correct?
With reference to the onset of menstruation, consider the following statements: 1. The first menstrual flow which begins at puberty is termed menarche. 2. Menstruation occurs once in about 10 to 15 days. 3. At 45 to 50 years of age, the menstrual cycle stops, which is termed menopause. Which of the statements given above are correct?
Consider the following statements regarding the development of the body during adolescence: 1. All parts of the body grow at the same rate during adolescence. 2. Sometimes arms and legs may look oversized and out of proportion initially. 3. Height depends on genes, but nutrition helps bones and muscles grow adequately. Which of the statements given above is/are correct?
With reference to the sebaceous glands, consider the following statements: 1. They are also known as oil glands. 2. Their secretion decreases during puberty. 3. Their increased activity prevents the formation of acne. Which of the statements given above is/are correct?
Consider the following statements regarding the sex chromosomes in humans: 1. Sperms are of two kinds: one containing an X chromosome and the other containing a Y chromosome. 2. An unfertilized egg contains either an X or a Y chromosome. 3. If a sperm with an X chromosome fertilizes the egg, the zygote develops into a female. Which of the statements given above is/are correct?
Consider the following statements regarding the role of Iodine in animal physiology: 1. It is essential for the production of insulin. 2. Its deficiency in water can prevent tadpoles from becoming adult frogs. 3. Its deficiency in the human diet can cause goitre. Which of the statements given above is/are correct?
With reference to the mechanism of hormone action, consider the following statements: 1. Hormones are chemical substances. 2. They are secreted through ducts directly into the target organ. 3. They act on every cell of the body equally. Which of the statements given above is/are correct?
Consider the following statements regarding the Pancreas: 1. It is exclusively an exocrine gland. 2. It secretes the hormone insulin. 3. It is located just below the stomach. Which of the statements given above is/are correct?
With reference to the "Adam's apple", consider the following statements: 1. It is the protruding part of the throat caused by the enlarged voice box. 2. It is more visible in girls than in boys. 3. It is associated with the high-pitched voice in children. Which of the statements given above is/are correct?
With reference to the pituitary gland's control over other glands, consider the following statements: 1. It stimulates the testes to produce testosterone. 2. It inhibits the ovaries from producing estrogen. 3. It stimulates the thyroid to produce thyroxine. Which of the statements given above are correct?
With reference to the nutritional value of milk, consider the following statements: 1. It is considered an incomplete food as it lacks calcium. 2. It provides nourishment to infants. 3. It is a rich source of proteins and calcium. Which of the statements given above is/are correct?
Consider the following statements regarding the growth hormone: 1. It is secreted by the pituitary gland. 2. It is primarily responsible for the development of secondary sexual characters. 3. Its secretion is controlled by the thyroid gland. Which of the statements given above is/are correct?
Consider the following statements regarding the transmission of HIV: 1. It can be transmitted through sexual contact with an infected person. 2. It is transmitted by casual contact such as shaking hands. 3. It can be transmitted from mother to infant through milk. Which of the statements given above is/are correct?
In a healthy human female, the reproductive cycle (menstrual cycle) repeats approximately every:
Which one of the following hormones is secreted to help the body adjust to acute stress or emergency situations?
The permanent cessation of menstruation in women, typically occurring between the ages of 45 and 50, is known as:
Which one of the following endocrine glands secretes hormones responsible for regulating the salt balance in the blood?
Which one of the following is classified as a ductless (endocrine) gland?
In humans, the sex of the offspring is genetically determined by:
With reference to the hormone Insulin, consider the following statements: 1. It is secreted by the adrenal glands. 2. Its deficiency leads to a condition known as diabetes. 3. It regulates the level of sugar in the blood. Which of the statements given above is/are correct?
Consider the following statements regarding the Adrenal glands: 1. They secrete a hormone called adrenalin. 2. They are primarily responsible for regulating the sleep-wake cycle. 3. They secrete digestive enzymes into the stomach. Which of the statements given above are correct?
Consider the following statements regarding the menstrual cycle: 1. Multiple ova are released by both ovaries simultaneously every month. 2. If fertilization does not occur, the thickened lining of the uterus is shed off along with its blood vessels. 3. The menstrual cycle is controlled by hormones. Which of the statements given above are correct?
Which one of the following best explains the cause of the disease known as Goitre?
Consider the following statements regarding the endocrine system: 1. Endocrine glands release hormones into the bloodstream to reach a specific body part called the target site. 2. The pituitary gland is an endocrine gland located inside the pancreas. 3. The pituitary gland secretes hormones that stimulate the testes and ovaries to produce their respective sex hormones. Which of the statements given above are correct?
Which one of the following endocrine glands is often referred to as the "master gland"?
In the context of human reproductive health, what does the term "Menarche" signify?
The presence of which one of the following minerals in water is essential for the metamorphosis of tadpoles into frogs?
The medical condition "Diabetes mellitus" is primarily caused by the deficiency or malfunction of which hormone?
The hormone "Thyroxine", which regulates carbohydrate, protein, and fat metabolism, is secreted by:
Match List I with List II and select the correct answer using the code given below: List I | List II A. Thyroid | 1. Insulin B. Pancreas | 2. Testosterone C. Adrenal | 3. Thyroxine D. Testis | 4. Adrenalin