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In this Class 10 Science topic from “The Human Eye and the Colourful World,” students learn how Earth’s atmosphere bends light as it passes through layers of air with different densities. The topic explains familiar effects such as the twinkling of stars, the apparent shifting of stars from their actual positions, and the advanced sunrise and delayed sunset. It also connects atmospheric refraction with the changing path of light observed near the horizon.
Hard · Level 1 · 1 questions
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Their basic structure and developmental plan
Only their colour
Only their size
Only their habitat
Question 1HardLevel 1
When homologous organs are taken as evidence of common ancestry, what is considered more important than outer shape?समजात अंगों को समान पूर्वज का प्रमाण मानते समय बाहरी आकार से अधिक किस बात पर ध्यान दिया जाता है?
Correct answer:सही उत्तर:A
Homologous organs can perform different functions and may look quite different externally, yet they retain similarities in their underlying structural arrangement and developmental plan. These similarities are interpreted as evidence inherited from a common ancestor, with later modification for different uses. Therefore A is correct. Colour, size, and habitat alone do not establish homology, so B, C, and D are inadequate.समजात अंगों के कार्य अलग हो सकते हैं और उनका बाहरी रूप भी भिन्न दिखाई दे सकता है, फिर भी उनकी अंदरूनी संरचना और विकास की मूल योजना में समानता रहती है। यह समानता सामान्य पूर्वज से मिली विरासत और बाद के अनुकूलन का संकेत देती है। इसलिए A सही है। केवल रंग, आकार या आवास समजातता सिद्ध नहीं कर सकते; अतः B, C और D गलत हैं।
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