Exploring Plant Cell Organelles

The video discusses unique structures in plant cells, focusing on the rigid cell wall and chloroplasts. The cell wall provides support and protection, while chloroplasts are responsible for photosynthesis, converting sunlight into energy-rich food. Chloroplasts have their own DNA and are believed to have originated from a photosynthetic bacterium ingested by a primitive eukaryote billions of years ago.

What is one of the main functions of the rigid outer cell wall in plant cells?

• To store nutrients

• To carry out photosynthesis

• To produce energy

• To provide structural support and protection

Which organelle is responsible for photosynthesis in plant cells?

• Mitochondria

• Nucleus

• Chloroplasts

• Ribosomes

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What do chloroplasts contain that is unique compared to other organelles?

• Their own DNA and ribosomes

• A double membrane

• Enzymes for digestion

• A rigid outer wall

From what are chloroplasts thought to have originated?

• Primitive eukaryotes

• Viruses

• Photosynthetic bacteria

• Fungi

How long ago is it believed that chloroplasts were ingested by a primitive eukaryote?

• Thousands of years ago

• Hundreds of years ago

• Millions of years ago

• Billions of years ago