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Revision Notes

Knowing the World Around Us

Telangana Open School (TOSS) · Class 12 · Psychology

Quick revision notes for Knowing the World Around Us — Telangana Open School (TOSS) Class 12 Psychology. Key concepts, formulas, and definitions for last-minute revision.

40 questions30 flashcards5 concepts

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Key Topics to Revise

1

Sense Organs and Stimuli

  • Humans have seven sense organs that detect ten different types of stimuli.
  • Five external senses: vision, hearing, smell, taste, and touch (including warmth, cold, and pain).
  • Two deep senses: kinesthetic (body position and movement) and vestibular (balance and head position).
2

Vision and the Eye

  • Vision is the most dominant sense, using about 90% of sensory input.
  • The eye's adequate stimulus is light (400–750 nm wavelength).
  • Main parts: cornea, iris, lens, retina.
3

Hearing and the Ear

  • Audition is the second most used sense after vision.
  • Sound is caused by pressure waves in the air with two properties: frequency (pitch) and amplitude (loudness).
  • Three parts of the ear: outer (pinna, auditory canal), middle (eardrum, ossicles), inner (cochlea, hair cells).
4

Skin, Taste, Smell, and Deep Senses

  • Skin is the largest sense organ — detects touch, pressure, temperature, and pain.
  • Meissner corpuscles detect touch; free nerve endings detect pain and temperature.
  • Taste has four primary types: sweet, sour, salty, bitter — detected by taste buds on the tongue.

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Full Notes

Key Concepts

The human body has seven senseThe eye is the primary organThe ear is divided into threeThe skin is the largest senseTaste is detected by taste buds

Frequently Asked Questions

What are the important topics in Knowing the World Around Us for Telangana Open School (TOSS) Class 12 Psychology?
Knowing the World Around Us covers several key topics that are frequently asked in Telangana Open School (TOSS) Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Knowing the World Around Us — Telangana Open School (TOSS) Class 12 Psychology?
Understand the core concepts first, then work through the 40 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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