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Besides minimising the loss of blood, why is it essential to plug any leak in a blood vessel? Name the component of blood which helps in this process and state how this component performs this function.
ANSWER: Besides minimising the loss of blood, plugging any leak in a blood vessel is essential to prevent germs and pathogens from entering the body, which could cause infections and diseases. The component of blood responsible for this process is platelets. When a blood vessel is cut, platelets gatRead more
ANSWER: Besides minimising the loss of blood, plugging any leak in a blood vessel is essential to prevent germs and pathogens from entering the body, which could cause infections and diseases. The component of blood responsible for this process is platelets. When a blood vessel is cut, platelets gather at the site of injury, release clotting factors, and help in the formation of fibrin threads. These threads trap blood cells, forming a clot that seals the wound. This prevents excessive bleeding and entry of harmful microorganisms into the bloodstream.
See lessWhich of the following statements are correct in reference to the role of A (shown in the given diagram) during a breathing cycle in human beings? (i) It helps to decrease the residual volume of air in lungs. (ii) It flattens as we inhale. (iii) It gets raised as we inhale. (iv) It helps the chest cavity to become larger.
ANSWER: [A] Explanation: The correct answer is [A] (ii) and (iv). During inhalation, the diaphragm flattens and the chest cavity becomes larger, allowing air to enter the lungs. Residual volume never decreases, and the diaphragm is raised only during exhalation.
ANSWER: [A]
Explanation: The correct answer is [A] (ii) and (iv). During inhalation, the diaphragm flattens and the chest cavity becomes larger, allowing air to enter the lungs. Residual volume never decreases, and the diaphragm is raised only during exhalation.
See lessWhich out of the three parts of the brain is known as the thinking part?
ANSWER: [A] Explanation: The correct answer is [A] Fore brain. The forebrain (cerebrum) is called the “thinking part” of the brain. It controls intelligence, reasoning, learning, memory, emotions, and voluntary actions. Midbrain and hindbrain mainly control reflexes, balance, and involuntary activitRead more
ANSWER: [A]
Explanation: The correct answer is [A] Fore brain. The forebrain (cerebrum) is called the “thinking part” of the brain. It controls intelligence, reasoning, learning, memory, emotions, and voluntary actions. Midbrain and hindbrain mainly control reflexes, balance, and involuntary activities.
See lessA female is suffering from irregular menstrual cycle. The doctor prescribed her some hormonal tablets. Which option shows the hormones she lacks in her body from the endocrine gland?
ANSWER: [A] Explanation: The correct answer is [A] Oestrogen. Oestrogen, secreted by the ovaries, regulates the menstrual cycle and development of female reproductive organs. Deficiency of oestrogen often causes irregular menstrual cycles. Testosterone is male hormone, while adrenalin and thyroxin aRead more
ANSWER: [A]
Explanation: The correct answer is [A] Oestrogen. Oestrogen, secreted by the ovaries, regulates the menstrual cycle and development of female reproductive organs. Deficiency of oestrogen often causes irregular menstrual cycles. Testosterone is male hormone, while adrenalin and thyroxin are unrelated to menstruation.
See lessA tall pea plant with round seeds (TTRR) is crossed with a short pea plant with wrinkled seeds (ttrr). The F₁ generation will be:
ANSWER: [D] Explanation: The correct answer is [D] 100% tall with round seeds. Genotype of parents → TTRR × ttrr. F₁ offsprings get one dominant allele from tall-round parent and one recessive from short-wrinkled. So all F₁ = TtRr (tall and round), showing dominant traits.
ANSWER: [D]
Explanation: The correct answer is [D] 100% tall with round seeds.
Genotype of parents → TTRR × ttrr. F₁ offsprings get one dominant allele from tall-round parent and one recessive from short-wrinkled.
See lessSo all F₁ = TtRr (tall and round), showing dominant traits.