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Science

Evolutionary relationships

Evolutionary relationships help Class 9 Science students understand how organisms are connected through common ancestry and how evidence such as similarities in structure, fossils, and other shared features can reveal these connections. In the chapter Patterns in Life: Diversity and Classification, learners see why classification is more than grouping by appearance: it can reflect the history of life and the gradual divergence of groups over time. The topic builds careful comparison and scientific reasoning about biodiversity.

Hard · Level 1 · 1 questions

Practice questions

01In an evolutionary tree, what can two branches being close to each other indicate?

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Answer and explanation

Correct answer: A. They may have a relatively recent common ancestor

The governing concept is the interpretation of an evolutionary or phylogenetic tree. Branching patterns represent relationships among organisms, and two branches that join near one another generally indicate that those organisms share a more recent common ancestor than organisms whose branches diverged earlier. They are not necessarily the same organism, and the tree does not imply absence of genes or that they never lived. Thus option A is correct.

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Evolutionary relationships

Practice questions

01In an evolutionary tree, what can two branches being close to each other indicate?वंश वृक्ष में दो शाखाओं का पास-पास होना क्या संकेत दे सकता है?

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01In an evolutionary tree, what can two branches being close to each other indicate?