Identify A to F in the given figure. (a) A-Outer...

\text { Identify } \mathrm{A} \text { to } \mathrm{F} \text { in the given figure. }(a) A-Outer membrane, B-Thylakoid, C-Stroma lamella, D-Inner membrane, E-Granum, F-Stroma (b) A-Thylakoid, B-Outer membrane, C-Stroma lamella, D-Inner membrane, E-Stroma, F-Granum (c) A-Stroma, B-Granum, C-Outer membrane, D-Stroma lamella, E-Inner membrane, F-Thylakoid (d) A-Inner membrane, B-Thylakoid, C-Stroma lamella, D-Outer membrane, E-Stroma, F-Granum

\text { Identify } \mathrm{A} \text { to } \mathrm{F} \text { in the given figure. }(a) A-Outer membrane, B-Thylakoid, C-Stroma lamella, D-Inner membrane, E-Granum, F-Stroma
(b) A-Thylakoid, B-Outer membrane, C-Stroma lamella, D-Inner membrane, E-Stroma, F-Granum
(c) A-Stroma, B-Granum, C-Outer membrane, D-Stroma lamella, E-Inner membrane, F-Thylakoid
(d) A-Inner membrane, B-Thylakoid, C-Stroma lamella, D-Outer membrane, E-Stroma, F-Granum

Key Concepts

Granum

A granum (plural: grana) is a stack of thylakoids held together by structural proteins. This stacking arrangement increases the surface area for light absorption and facilitates efficient electron transport during the light reactions.

Stroma

The stroma is the aqueous matrix that fills the interior of the chloroplast. It contains enzymes for the Calvin cycle, chloroplast DNA, ribosomes, and is the site for the synthesis of carbohydrates.

Thylakoid

Thylakoids are flattened, sac-like membranes within the chloroplast where the light-dependent reactions of photosynthesis occur. They contain the chlorophyll and other pigments necessary for absorbing light energy.

Stroma Lamella

Stroma lamellae are membrane connections that extend between grana. They facilitate the distribution of proteins and pigments, allowing communication and transport between different regions of the thylakoid system.

Outer Membrane

The chloroplast outer membrane is the smooth, permeable barrier that encloses the organelle. It regulates the passage of small molecules and is relatively less selective than the inner membrane.

Inner Membrane

The inner membrane of the chloroplast, also referred to as the inner envelope membrane, is pivotal in controlling the movement of substances into the stroma and is involved in various biosynthetic processes. It is more selective and integral to chloroplast function.

Chloroplast Structure

Chloroplasts are double-membraned organelles found in plants and algae that are key to photosynthesis. They contain internal membrane systems where light-dependent reactions occur and internal fluids that house enzymes for the light-independent reactions.

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