Q1
The hormone that promotes cell division and is used to delay ageing in plant parts is:
📝 SolutionCytokinins promote cell division and are found in higher concentration in rapidly dividing tissues like fruits and seeds; they delay senescence (ageing).
Q2
The endocrine gland that secretes insulin to regulate blood sugar is the:
📝 SolutionThe pancreas secretes insulin, which lowers blood glucose levels by promoting its conversion to glycogen; insufficient insulin causes diabetes.
Q3
Growth hormone, which regulates overall body growth, is secreted by the:
📝 SolutionThe pituitary gland, often called the master gland, secretes growth hormone; its deficiency or excess in childhood causes abnormal growth (dwarfism or gigantism).
Q4
Assertion (A): Plants show tropic movements though they lack a nervous system.
Reason (R): Plant movements and coordination are controlled mainly by hormones.
Choose the correct option:
Reason (R): Plant movements and coordination are controlled mainly by hormones.
Choose the correct option:
📝 SolutionPlants have no nerves or muscles, so their directional growth movements (tropisms) are brought about by chemical coordination through hormones like auxin. R correctly explains A.
Q5
Assertion (A): Adrenaline is called the 'fight or flight' hormone.
Reason (R): Adrenaline increases heartbeat, breathing rate and blood flow to muscles during an emergency.
Choose the correct option:
Reason (R): Adrenaline increases heartbeat, breathing rate and blood flow to muscles during an emergency.
Choose the correct option:
📝 SolutionAdrenaline, secreted by the adrenal glands in stressful situations, prepares the body to respond quickly by increasing heart rate, breathing and blood supply to muscles. R correctly explains A.
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Class 10 · Science
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