Science
Differentiate between the following pairs of terms based on the clues given in parentheses:
(i) Cell membrane and cell wall (permeability)
(ii) RER and SER (structure)
(iii) Chloroplasts and chromoplasts (pigments)
Cell
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Answer
(i) Cell membrane and cell wall (permeability) — The cell membrane is selectively permeable, which means it allows some substances to pass through while blocking others. The cell wall is permeable, allowing water and some dissolved minerals to pass through it.
(ii) RER and SER (structure) — The Rough Endoplasmic Reticulum (RER) has ribosomes attached to its surface, which gives it a rough appearance under an electron microscope. The Smooth Endoplasmic Reticulum (SER) does not have ribosomes on its surface and therefore appears smooth.
(iii) Chloroplasts and chromoplasts (pigments) — Chloroplasts contain the green pigment chlorophyll. Chromoplasts contain other pigments that may be yellow, orange or red.
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