Question

The plastids which are coloured, green and colourless are known respectively as:
A. Chloroplasts, Chromoplasts, Leucoplasts.
B. Chromoplasts, Leucoplasts, Chloroplasts.
C. Leucoplasts, Chloroplasts, Chromoplasts.
D. Chromoplasts, Chloroplasts, Leucoplasts.

Answer 1

Hint: Plastids are membrane bound organelles found in plant cells, algae and some other eukaryotic organisms. These contain pigments which determine the cell’s color and these pigments are used in the process of photosynthesis. Plastids are of three types, these are: chloroplasts, chromoplasts and leucoplasts.

Complete answer:
Option A Chloroplasts, Chromoplasts, Leucoplasts: Chloroplasts contain green color pigment called chlorophyll and the green color of leaves are due to presence of these only. Chromoplasts, as the name suggests chroma means color. These contain red-, orange- and yellow-colored pigments. Leucoplasts do not contain any pigment and so they are called colorless plastids.
Option A is not correct.
Option B Chromoplasts, Leucoplasts, Chloroplasts: Chromoplasts, as the name suggests chroma means color. These contain red-, orange- and yellow-colored pigments. Leucoplasts do not contain any pigment and so they are called colorless plastids. Chloroplasts contain green color pigment called chlorophyll and the green color of leaves are due to presence of these only.
Option B is not correct.
Option C Leucoplasts, Chloroplasts, Chromoplasts: Leucoplasts do not contain any pigment and so they are called colorless plastids. Chloroplasts contain green color pigment called chlorophyll and the green color of leaves are due to presence of these only. Chromoplasts, as the name suggests chroma means color. These contain red-, orange- and yellow-colored pigments.
Option C is not correct.
Option D Chromoplasts, Chloroplasts, Leucoplasts: Chromoplasts, as the name suggests chroma means color. These contain red-, orange- and yellow-colored pigments. Chloroplasts contain green color pigment called chlorophyll and the green color of leaves are due to presence of these only. Leucoplasts do not contain any pigment and so they are called colorless plastids.

Hence, Option D is the correct answer.

Note:
Plastids synthesize and store food and various molecules in plants. Photosynthesis in plants occurs due the presence of chloroplasts as they help in trapping sun’s energy for the production of food. Chromoplast contains various colorful plastids which provide color to the petals and sepals of the flower helping in attracting insects for pollination. Leucoplasts are storage plastids and they store starch, fats and proteins.