Greenhouse Gases Identification
Greenhouse gases are atmospheric gases that absorb and emit thermal infrared radiation. This process is the fundamental cause of the greenhouse effect.
Analyzing Atmospheric Gases
Let's examine each option to determine if it is a greenhouse gas:
- 1. Methane ($CH_4$): Yes, methane is a potent greenhouse gas, significantly contributing to global warming.
- 2. Water vapour ($H_2O$): Yes, water vapour is the most abundant greenhouse gas and plays a crucial role in the natural greenhouse effect.
- 3. Sulphur dioxide ($SO_2$): No, sulphur dioxide is primarily considered an air pollutant contributing to acid rain. While it can have indirect climate effects (e.g., forming aerosols that reflect sunlight), it is not typically classified as a primary greenhouse gas in the same category as others.
- 4. Nitrous oxide ($N_2O$): Yes, nitrous oxide is a powerful greenhouse gas with a long atmospheric lifetime.
Conclusion on Greenhouse Gases
Based on the analysis, the greenhouse gases from the list provided are:
- Methane
- Water vapour
- Nitrous oxide
Therefore, options 1, 2, and 4 are correct.
Important Questions from Abiotic factors
The table below lists potential environmental conditions in future climates, related to atmospheric carbon dioxide concentrations ($CO_2$) and mean annual temperature (MAT).
The table also lists potential outcomes with respect to whether conditions will favour grasses with C3 or C4 photosynthetic pathways.
Assuming no other changes in environmental conditions, match the options in the two columns.Environmental conditions Outcomes (P) Increased $CO_2$, no change in MAT (i) C3 performs better than C4 (Q) No change in $CO_2$, increased MAT (ii) C4 performs better than C3 (iii) C3 and C4 perform equally - Mean global temperature since pre-industrial times has increased approximately by
- Terrestrial plants conduct gas exchange through stomata. Having only few stomata on the leaf surface is a common adaptation to which one of the following conditions?
- Some air-breathing marine vertebrates such as whales, seals and marine turtles possess adaptations for long, deep dives. Which one or more of the following is/are examples of such adaptations?
- You are a plant ecologist studying a plant in the genus Veronica. You notice that, at open rocky sites, Veronica grows as a creeper spreading low to the ground, whereas in grasslands, the stem stands upright. You collect seeds from multiple populations in each habitat type and grow them under uniform conditions in a greenhouse. You find that all the plants grown in the greenhouse have stems that stand upright. Which one or more of the following explanations best support(s) your observations?
