GS PrelimsScience and TechnologyGeneral Science2007

Which of the following types of light are strongly absorbed by plants?

Violet and orange

Blue and red

Indigo and yellow

Yellow and violet

Correct Answer: Option B

Explanation

1. Plants contain pigments, primarily chlorophylls and carotenoids, which absorb light energy for photosynthesis. 2. Chlorophyll, the main photosynthetic pigment, strongly absorbs light in the blue (around 430 nm) and red (around 662 nm) portions of the visible spectrum. It reflects green light, which is why plants appear green. 3. Therefore, blue and red light are most strongly absorbed by plants.

More Science and Technology PYQs

With reference to Unmanned Aerial Vehicles (UAVs), consider the following statements : 1. All types of UAVs can do vertical landing. 2. All types of UAVs can do automated hovering. 3. All types of UAVs can use battery only as a source of power supply. How many of the statements given above are correct?
In the context of electric vehicle batteries, consider the following elements : 1. Cobalt 2. Graphite 3. Lithium 4. Nickel How many of the above usually make up battery cathodes?
Consider the following substances : 1. Ethanol 2. Nitroglycerine 3. Urea Coal gasification technology can be used in the production of how many of them?
Consider the following statements : 1. No virus can survive in ocean waters. 2. No virus can infect bacteria. 3. No virus can change the cellular transcriptional activity in host cells. How many of the statements given above are correct?
Consider the following statements : 1. Statement I: Activated carbon is a good and an attractive tool to remove pollutants from effluent streams and to remediate contaminants from various industries. 2. Statement II: Activated carbon exhibits a large surface area and a strong potential for adsorbing heavy metals. 3. Statement III : Activated carbon can be easily synthesized from environmental wastes with high carbon content. Which one of the following is correct in respect of the above statements?
Consider the following statements : 1. Statement I: Some rare earth elements are used in the manufacture of flat television screens and computer monitors. 2. Statement II : Some rare earth elements have phosphorescent properties. Which one of the following is correct in respect of the above statements?

View all Science and Technology questions →

Master UPSC Revision

Get 10,000+ topic-wise MCQs, spaced repetition, daily CSAT challenges, and detailed performance analytics.

Coming Soon to Play Store