Photosynthesis and Plant Pigments

The video explains how living organisms require energy, focusing on photoautotrophs that use photosynthesis. It details the structure of chloroplasts, including membranes, stroma, and thylakoids, and describes the role of chlorophyll and other pigments. The anatomy of leaves, including the epidermis and mesophyll cells, is discussed in relation to photosynthesis.

What is the primary function of a photoautotroph?

• To consume other organisms for energy

• To produce its own food using light energy

• To decompose organic material

• To store energy in the form of fat

What is the main role of chloroplasts in plant cells?

• To capture light energy and convert it into chemical energy

• To store water

• To transport nutrients

• To provide structural support

Where do the light reactions of photosynthesis occur?

• In the stroma

• In the cytoplasm

• In the outer membrane

• In the thylakoid membrane

Why are chloroplasts green?

• Because of the presence of anthocyanins

• Because of the presence of phycobilins

• Because of the presence of chlorophyll

• Because of the presence of carotenoids

Which pigment is directly involved in absorbing sunlight?

• Carotenoids

• Anthocyanins

• Chlorophyll

• Phycobilins

What is the role of carotenoids in photosynthesis?

• To store energy

• To absorb light and transfer energy to chlorophyll

• To directly transfer light energy to photosynthesis reactions

• To transport water

Which pigments are not found in plants but are present in algae and cyanobacteria?

• Chlorophyll

• Phycobilins

• Carotenoids

• Anthocyanins

What is the primary site of photosynthesis in a leaf?

• Stomata

• Guard cells

• Epidermis cells

• Mesophyll cells

What is the function of stomata in leaves?

• To provide structural support

• To transport nutrients

• To allow gas exchange

• To store chlorophyll

Which cells in a leaf do not contain chloroplasts?

• Guard cells

• Palisade cells

• Mesophyll cells

• Epidermis cells