Organelles In Plants Flashcards

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1
Q

What is cell wall and what is it made of

A

Formed outside the cell membrane and offer structural support to the cell made by the polysaccharide cellulose

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2
Q

What is middle lamella

A

Forms the outermost layer of the plant cell and acts like glue to stick adjacent plant cells together and provides stability to the plant

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3
Q

What are plasmodesmata

A

Narrow threads of cytoplasm (surrounded by a cell membrane) connecting the cytoplasm of neighbouring plant cells which allows substances to be transported between plant cells and facilitates cell to cell communication

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4
Q

What are pits

A

Very thin regions of cell wall, pits in adjacent plant cells are lined up in pairs which facilitates the transport of substances between cells

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5
Q

Are chloroplasts larger or smaller than ribosomes

A

Larger

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6
Q

What are chloroplasts surrounded by

A

A double membrane

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7
Q

Where are chlorophyll found and what do they form

A

In membrane-bound compartments called thylakoids stack to form structures called grana (singular=granum)

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8
Q

What are grana joined together by

A

Joined together by lamellae (thin and flat thylakoid membranes)

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9
Q

Where is site of photosynthesis

A

Certain parts occur in thylakoid membranes while other parts happen in the stroma

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10
Q

What do chloroplasts also contain

A

Contain small circular pieces of DNA and ribosomes used to synthesise proteins needed in chloroplasts replication and photosynthesis

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11
Q

Why are chloroplasts green

A

Due to presence of pigment chlorophyll

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12
Q

What are amyloplasts

A

Small membrane bound organelles containing starch granules
-responsible for storing starch in plants and converting it back to glucose when the plant needs it

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