5.5 Plastids Flashcards
Plastids are found in:
All plant cells and Euglenoids
Plastids are not visible under the microscope.
T/F
False,
Plastids are easily visible as they are large.
Plastids bear some specific ______, which impart specific ______ to the plants.
pigments; colors
Based on the type of ______,
plastids can be classified into:
Pigments;
I. Chloroplasts
II. Chromoplasts
III. Leucoplasts.
Chloroplasts contain ______ and ______ pigments which are responsible for ______.
chlorophyll and carotenoid pigments;
Trapping light energy
Light energy trapped by pigments of chloroplast is required for __
Photosynthesis
Chromoplasts contain ______ pigments like ______, and others are present.
fat-soluble carotenoid pigments; Carotene and xanthophyll
Choromoplasts provide plants ______ colors.
yellow, orange or red colour
The colorless plastids of varied shapes and sizes are called ______.
Leucoplasts
The function of leucoplast is to ________.
store nutrients
Types of Leucoplasts and their function:
I. Amyloplasts store carbohydrates (starch), e.g., potatoes
II. Elaioplasts store oils and fats
III. Aleuroplasts store proteins
Topic Chloroplast
The majority of chloroplast of green plants is found in ______ cells of ______ part of plants.
Mesophyll cells of leaves
Shape of Chloroplasts:
I. lens-shaped
II. Oval
III. Spherical
IV. Discoid
V. Ribbon-like organelles
Size of Chloroplasts:
variable length (5-10μm) and width (2-4μm)
The number of chloroplasts in the mesophyll of:
I. Chlamydomonas -
II. Green Algae -
I. Chlamydomonas - 1 per cell
II. Green Algae - 20-40 per cell
Chloroplasts and Mitochondria both are double membrane-bound organelles.
T/F
True
______ (inner/outer) chloroplast membrane is relatively less permeable than the other.
Inner
The space limited by the inner membrane of the chloroplast is called _______.
Stroma
The Stroma of Chloroplast contains:
I. Enzymes
II. Small, ds circular DNA molecules
III. Ribosomes
The stroma of Chloroplast contains enzymes required for the synthesis of ______.
Carbohydrates and proteins
In Stroma, a number of organized flattened membranous sacs called ______
Thylakoids
The membrane of the thylakoids encloses a space called ______.
lumen
Chlorophyll pigments are present in ______.
Thylakoids
Thylakoids are arranged in stacks like ______ called ________.
piles of coins; Grana (singular: granum)
Grana is also known as:
Inter-granal thylakoids
The flat membranous tubule joining thylakoids of different grana is called ______.
stroma lamellae
Ribosomal subunit present in chloroplasts is _____.
70S
The ribosomal subunit present in chloroplasts is _____.
70S
Ribosomes of the chloroplasts are smaller (70S) than the Eukaryotic cytoplasmic ribosomes (80S).
T/F
True
______ and ______ are semi-autonomous organelles.
Mitochondria; Chloroplasts
