Photosynthesis and Light Absorption Concepts

The video tutorial explores the spectral qualities of light and how they affect plant absorption throughout the day. It explains how light can be characterized by intensity and spectral quality, with a focus on photosynthetically active radiation. The tutorial also covers the characteristics of photosynthetic pigments like chlorophyll and accessory pigments such as carotenoids, highlighting their roles in light absorption and photosynthesis.

When do plants absorb the most light?

• Early morning

• At night

• During midday

• In the evening

What is another term for light intensity?

• Light density

• Spectral quality

• Radiance

• Photon fluence

What is the maximum light intensity measured in micro moles per square meter per second at midday?

• 500

• 1000

• 3000

• 2000

Which type of light is enriched in the sky during midday?

• Green light

• Yellow light

• Red light

• Blue light

What happens to the spectral quality of light at dusk?

• It remains the same as midday

• It becomes enriched in blue light

• It becomes enriched in green light

• It becomes enriched in red and orange light

What is the primary pigment involved in photosynthesis?

• Xanthophylls

• Chlorophyll A

• Chlorophyll B

• Carotenoids

Which pigment is known for its photoprotective function?

• Beta carotene

• Chlorophyll A

• Chlorophyll B

• Xanthophylls

What is the role of the hydrocarbon tail in chlorophyll molecules?

• Anchors the pigment in the membrane

• Reflects green light

• Absorbs light

• Produces chlorophyll

What element is at the center of the porin ring in chlorophyll?

• Calcium

• Magnesium

• Sodium

• Iron

Which pigment absorbs light in the blue-green region of the spectrum?

• Chlorophyll A

• Chlorophyll B

• Xanthophylls

• Carotenoids