Question

UNIT 1
PROTECTORS OF BIOSPHERE
Concept area - Structure of chloroplast
OR
Activity-1
D9IIDO
Analyse the description and illustration given below and answer the questions.
In plants photosynthesis takes place in chloroplast. Stroma is the fluid part which is
seen inside the double membrane of chloroplast. Grana is the pack of membraneous
sacs seen inside the chloroplast. Grana contain pigments like Chlorophyil a, chlorophyll b,
carotene and xanthophyll which can absorb sunlight.
However, only chlorophyll a can participate directly in photosynthesis. All other pigments
absorb light and transfer it to chlorophyll a. Hence chlorophyll b, carotene and
Xanthophyll are called accessory pigments.
Stroma
Grana
Double membrane
a) Identify the following parts and label them in the figure of chloroplast given below.
(i) Part of the chloroplast where pigments are present.
(ii) Fluid part of the chloroplast.
b) All pigments present in the chloroplast can absorb sunlight and can participate
directly in photosynthesis.
What is your opinion on this statement?​

Answer 1

Answer:

a 1)grana

2)stroma

b)it is wrong .only chlorophyll a can participate directly in photosynthesis. All other pigments absorb light and transfer it to chlorophyll a. Hence other pigments are called accessory pigments

2)