How to read this chapter's question shapes
Everything below is a real NEET paper item. Several shapes recur, and each has a way in that is worth as much as the content, because it tells you where to spend your time.
Classify the pair. A large share of this chapter's items put two structures side by side and ask what the resemblance between them means. There is one question to ask and it is not "do they look alike": ask whether the two are built from the same part inherited from a shared ancestor or from different parts pressed into the same job. Shared origin with different work is one answer; different origin with the same work is the other. Everything else in the option set -- the names of the two processes that produce each, the direction of evolution each implies -- follows from that single decision, so make it first and let the options sort themselves.
The roster item. Several stems ask which name belongs to a set, or which does not. These sets are closed, so the work is membership rather than plausibility. Where an option carries three names, one intruder spoils the whole option, so read every name in an option before accepting it. Where two names differ only in a qualifier, that qualifier is carrying the whole of the difference, so do not read past it.
The ordering item. The content of a sequence question is in its middle, but the way in is at its ends. Fix the earliest entry and the latest entry first; between them they usually strike every option but two, and the remaining decision is a single adjacent pair. The same method works whether the sequence runs over forms, over events or over layers of rock.
The multi-row match. A match question is four questions wearing one coat, and it is almost never necessary to answer all four. Find the single row you are surest of, strike every option that contradicts it, and look at what is left; two confident rows settle nearly every list this chapter sets. Prefer the row whose subject you have met most often, not the one that comes first in the list.
The statement pair and the assertion with a reason. Decide each statement alone, and write down the two verdicts, before you look at the relation between them. Only then ask whether the second explains the first, and be strict: a reason may be perfectly true, and about the same subject, and still explain something other than what the assertion claims. The other thing to watch in a two-statement item is that a verdict on one half never carries across to the other: each has to be judged on its own, however confident the first one made you.
[NEET Important] Two habits cost marks in this section specifically. The first is answering a "which is NOT" stem as though it read "which IS" -- this chapter's papers use the negative form heavily, and it is worth underlining the word before you look at the options. The second is treating a term you half-recognise as correct because it sounds technical. A term can be perfectly real and still belong to a different part of the syllabus from the one the stem is asking about.