Behind Sensations — Flashcards
Kerala Board · Class 10 · Biology
22 flashcards for Behind Sensations (Kerala Board Class 10 Biology) to test yourself on key terms and facts. Sample: "What are stimuli and how are they.
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What are stimuli and how are they classified?
Answer
Stimuli are circumstances that lead to responses in living beings. They are classified into: 1. External stimuli - changes outside the body (light, sound, temperature) 2. Internal stimuli - changes in…
Explain the process from stimulus detection to response formation.
Answer
1. Stimuli are detected by sensory receptors 2. Receptors generate electrical impulses (receptor potential) 3. High concentration of impulses forms action potential in neurons 4. Action potential trav…
What are sensory receptors and how are senses classified?
Answer
Sensory receptors are specialized cells or nerve endings that recognize stimuli and produce electrical impulses. Senses are classified as: 1. General senses - touch, pain, heat, pressure (receptors in…
Match the sense organs with their receptors and stimuli: Eye, Ear, Tongue, Nose, Skin
Answer
Eye - Photoreceptors - Light Ear - Mechanoreceptors - Sound waves Tongue - Chemoreceptors - Chemical substances (taste) Nose - Chemoreceptors - Chemical molecules (smell) Skin - Various receptors - To…
Describe the three layers of the eye and their main functions.
Answer
1. Sclera (outer layer) - Provides firmness and protection; includes cornea (transparent, allows light entry) 2. Choroid (middle layer) - Provides oxygen and nutrients; includes iris (controls pupil s…
What are rod cells and cone cells? Compare their structure and function.
Answer
Rod cells: - Cylindrical shape, ~9 crore in number - Contain rhodopsin pigment - Function in dim light and black-white vision Cone cells: - Cone-shaped, ~45 lakh in number - Contain photopsin pigment…
How does the pupil size change in different light conditions?
Answer
The pupil size is controlled by two types of muscles in the iris: 1. In dim light: Radial muscles contract → pupil dilates (becomes larger) → allows more light to enter 2. In bright light: Circular mu…
What is power of accommodation and how does it work?
Answer
Power of accommodation is the eye's ability to focus images of both near and distant objects on the retina by changing lens curvature. For distant objects: Ciliary muscles relax → ligaments pull lens…
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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