Question

Stroma in the chloroplasts of the higher plants contains?

• A. Light-independent reaction enzymes
• B. Chlorophyll
• C. Ribosomes
• D. Light-dependent reactions

Answer 1

The correct option is A

Light-independent reaction enzymes

The correct option is A:

Explanation of the correct option:

1. Chloroplasts are organelles that execute the specific function of photosynthesis in plant and algal cells.
2. The chloroplasts of higher plants are biconvex and vesicular, with a colorless center and narrow middle zone, and chlorophyll-filled edges.
3. The chloroplasts are double-membraned, enclosing the stroma, a semi-gel fluid that contains different enzymes for photosynthetic reactions.
4. Chloroplast DNA, thylakoid systems, proteins, starch granules, and chloroplast ribosomes are all floating around in the stroma.
5. NADPH and ATP are employed in light-independent reactions, which power the assembling of sugar molecules, and their ultimate purpose is to transform solar energy into chemical energy.
6. Light-dependent reactions are the first stage of photosynthesis. To create NADPH and ATP, pigment molecules and protein complexes collaborate.
7. A multiprotein complex termed a photosystem transforms light energy into chemical energy. The thylakoid membrane, a component of the chloroplast, contains the photosystem I (PSI) and photosystem II (PSII) types of photosystems.
8. Numerous antenna proteins make up each photosystem, and these proteins each contain 300–400 chlorophyll a and b molecules as well as other pigments like carotenoids.
9. Other significant protein complexes in the thylakoid membrane that collaborate with the photosystems to produce ATP and NADPH include the cytochrome b6f complex and ATP synthase.

Explanation of the incorrect options:

Option B:

1. Chlorophyll is the pigment present in a plant's plastid.

Option C:

1. Ribosomes are organelles concerned with protein synthesis.

Option D:

1. In the presence of solar energy, light-dependent processes occur in the thylakoid membrane of chloroplasts.

Final answer: Stroma in the chloroplasts of the higher plants contains light-independent reaction enzymes.