Plastids

Plastids

By: Shehzeen Fatima

Introduction and Types of Plastids

Plastids are also membrane-bound organelles that only occur in the cells of plants and photosynthetic

protists (algae). They are of three types i.e chloroplasts, leucoplasts, and chromoplasts.

Multiple Select

What are the three types of plastids?

• chloroplasts

• mitochondria

• leucoplasts

• chromoplasts

• cell membrane

Chloroplast

Like mitochondria, chloroplast is also bound by a double membrane. The outer membrane is smooth while the inner membrane gives rise to sacs called thylakoids. The stack of thylakoids is

called granum (plural = grana).

Multiple Choice

The stack of thylakoids is called

• granum

• grana

• granny

• stomata

Cholorophyl

Chloroplasts are the sites of photosynthesis in eukaryotes. They contain chlorophyll (the green pigment necessary for photosynthesis) and associated pigments. These pigments are present in the thylakoids of grana.

Multiple Choice

Chlorophyl is.....

• a green pigment

• green paint

• food color

• plasma

Chromoplasts

The second type of plastids in plant cells are chromoplasts. They contain pigments associated with bright colors and are present in the cells of flower petals and fruits. Their function is to give colors to these parts and thus help in pollination and dispersal of fruit.

Multiple Select

What is the function of chromoplasts?

• to give colors to petals

• disturb plants

• help in pollination

• dispersal of fruit

• watering plants

Leucoplasts

Leucoplasts are the third type of plastids. They are colorless and store starch, proteins, and lipids. They are present in the cells of those parts where food is stored.

Multiple Select

Characteristics of leucoplasts

• colorless

• colorful

• store water

• store starch, proteins and lipids

Open Ended

What did you understand from today's lesson?

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