Plastids and Different Types of Plastids MCQ - Practice Questions & Answers

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EASY

Which one of the following cellular parts is correctly described?

Centrioles - sites for active RNA synthesis

Ribosomes - those on chloroplasts are larger (80s) While those in the cytoplasm are smaller (70s)

Lysosomes - optimally active at a pH of about 8.5

Thylakoids - Flattened membranous sacs forming the grana of chloroplasts

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From the following cellular components, the organelle that is present in plant cells and absent in animal cells is

Mitochondria

Golgi bodies

Plastids

All of these

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Plastids

Plastids
Plastids are the semi-autonomous organelles that are the characteristic feature of plant cells. These are of following three types:

1. Leucoplasts: These are colourless plastids that are seen in the non-green plant cells. They do not possess grana and photosynthetic pigments. They primarily perform storage functions. Depending on the storage material, they are of three types:
(a) Amyloplasts: starch storing
(b) Elaioplasts: fat or oil storing
(c) Aleuroplasts: protein storing

2. Chromoplasts: These contains carotenoids pigments and are red or yellow in colour. These are present in the coloured regions of the plants such as flowers, fruits etc.

3. Chloroplasts: These are green plastids primarily concerned with the process of photosynthesis.