Section A: Diagram Based Questions
- Draw the structure of a neuron and label the following parts:
(a) Where info is acquired.
(b) Where impulse travels as electricity.
(c) Where impulse is converted to chemical signal.
- Draw a schematic diagram of a Reflex Arc. Clearly mark the direction of flow of impulse. Label
'Receptor' and 'Effector'.
- In a diagram of the human brain, identify the parts A, B and C.
A: Seat of intelligence.
B: Controls balance.
C: Controls respiration and heart beat.
- Draw a diagram showing positive phototropism in a plant shoot and negative geotropism in a plant
root.
- Mark the location of the following glands on an outline of the human body: Pituitary, Thyroid,
Pancreas, Adrenal.
Section B: Scientific Reasoning
- A potted plant kept near a window bends towards sunlight. Explain the mechanism involving Auxin.
- Why is the Pituitary gland often called the "Master Gland"?
- Why do diabetic patients often take insulin injections? What would happen if they took it orally?
(Protein digestion).
- Why are chemical signals (hormones) needed in addition to electrical signals (nervous system)?
(Reach all cells vs only connected ones).
- Why does the stem of a plant bend upwards and root downwards even if the pot is kept horizontally?
(Geotropism).
- How does the brain know that we have eaten enough? (Satiety center).
- Why is the flow of signals in a synapse unidirectional? (Neurotransmitter release only at axon end).
- Why do climbing plants like pea plants coil around a support? (Thigmotropism / Differential growth).
Section C: Differentiate & Compare
- Compare Nervous Mechanism and Hormonal Mechanism (Speed, Duration, Mode of transmission).
- Differentiate between Tropic Movements and Nastic Movements.
- Differentiate between Gustatory receptors and Olfactory receptors.
- Compare the function of Insulin and Glucagon (though Glucagon is extra, compare broadly as sugar
regulation).
- Differentiate between Involuntary action and Reflex action.
