Biological Science Important Diagrams

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Draw the Bowman's capsule as a cup enclosing the glomerulus ball. PCT and DCT are coiled — draw them wavy. Loop of Henle dips down into a U-shape. All six labels must be present for full marks.

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Draw a star-shaped cell body with short, branching dendrites on one side. The long axon extends from the other side, with the myelin sheath shown as segments (nodes of Ranvier = gaps between segments). End with the axon terminal branching into buttons.

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Left ventricle has thicker walls than right — draw this clearly. Right side carries deoxygenated blood (from body → lungs). Left side carries oxygenated blood (from lungs → body). Label at least 8 of the 10 parts for full marks.

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Draw two horizontal lines (upper and lower epidermis). Pack tall, cylindrical palisade cells just below upper epidermis. Loosely packed spongy cells go below — leave visible air spaces. Stomata open from lower epidermis — draw two kidney-shaped guard cells around the pore.

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Draw the spinal cord as a vertical oval in the centre. Receptor is on the left — arrow goes from receptor → sensory neuron → spinal cord (dorsal root). Motor neuron exits from spinal cord (ventral root) → effector on the right. Show arrows indicating direction of impulse.

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Draw the flower in longitudinal section (cut down the middle). Stamen is male — show the anther at the top of the filament. Carpel is female — the ovary at the base with ovules inside. Stigma is at the top of the style, where pollen lands.