Environmental Science

Let’s match the international agreements with the corresponding issues:
P. Ramsar Convention: The Ramsar Convention deals with the conservation of wetlands, so P matches with (iv) Conservation of wetlands.
Q. Kyoto Protocol: The Kyoto Protocol is an international treaty that targets climate change by reducing greenhouse gas emissions, so Q matches with (iii) Climate change.
R. Basel Convention: The Basel Convention focuses on the trans-boundary movement of hazardous wastes, so R matches with (ii) Trans-boundary movement of hazardous wastes.
S. Montreal Protocol: The Montreal Protocol aims to protect the ozone layer by phasing out substances that deplete it, so S matches with (i) Ozone depletion.
Thus, the correct matching is P-(iv), Q-(iii), R-(ii), S-(i).
Final Answer:

Let’s match the terms from Column I to Column II based on their respective relationships:
P. Diffusion: Diffusion is governed by Fick's law, which relates the rate of diffusion to the concentration gradient. Therefore, P matches with (ii) Fick.
Q. Drag force: Drag force is described by Stokes' law for particles moving through a fluid. Hence, Q matches with (iii) Stokes.
R. Atmospheric stability: Atmospheric stability is a term used in Pasquill's stability classes to categorize the degree of turbulence in the atmosphere, so R matches with (i) Pasquill.
Thus, the correct matching is P-(ii), Q-(iii), R-(i).
Final Answer:

For first-order reactions, the reactor volume depends on the desired conversion. - PFR (Plug Flow Reactor) generally requires less reactor volume than CFSTR (Continuous Flow Stirred Tank Reactor) because, in a PFR, the reactants are not mixed as in a CFSTR, leading to a higher concentration of reactants along the reactor length, which leads to higher reaction rates in the early stages of the reactor. - CFSTR, on the other hand, operates with well-mixed conditions, leading to a lower average concentration of reactants and thus a lower reaction rate. However, the volumes required for both reactors depend on the desired outlet concentration, reaction kinetics, and the operating conditions. In some cases, a CFSTR may require less volume if the reaction kinetics and conditions are such that the CFSTR is more efficient than the PFR for the specific case. Final Answer:

A wind rose is a graphical representation used in meteorology to depict the frequency of wind directions and speeds at a particular location. It is a circular chart divided into sections, each corresponding to a wind direction. The main elements that are typically included in a wind rose are:
- Wind speed (B): A wind rose represents the frequency of different wind speeds. This is typically shown as different lengths of the spokes or radii in the diagram, with each radius representing a different wind speed category.
- Wind direction (C): The wind rose shows the direction from which the wind is blowing, which is represented by the different sectors of the chart. Each sector corresponds to a compass direction (e.g., North, South, East, West).
- Percentage of time (D): The wind rose can also show the percentage of time the wind blows from a particular direction or at a particular speed. This is often represented by the length of the radii or the size of the sectors, with the larger sectors or longer radii indicating more frequent wind directions or speeds.
The mixing height (A) is not a component of the wind rose. Mixing height refers to the height in the atmosphere where pollutants or other substances are mixed and dispersed, which is not typically shown on a wind rose.
Thus, the correct answer is that a wind rose includes wind speed, wind direction, and percentage of time.
Final Answer: \boxed{(B) Wind speed, (C) Wind direction, (D) Percentage of time}

The net present worth of a series of annual profits is given by the formula: where:
- is the annual profit,
- is the discount rate,
- is the operational life.
Substitute the values into the formula: Thus, the net present worth is ₹ 58,908.

We use Manning's equation to calculate the flow when the sewer is running full: where:
- is the flow,
- is the cross-sectional area,
- is the hydraulic radius,
- is the slope, and
- is the roughness coefficient.
For a circular pipe, when the pipe is full, the area and hydraulic radius are related to the diameter, and we can calculate the ratio of the actual flow to the full flow. After calculations, we find the ratio of the actual flow to the full flow is approximately: Thus, the ratio is .

The head loss in a pipe due to friction is given by the Darcy-Weisbach equation: where is the Darcy friction factor, is the length of the pipe, is the diameter, is the velocity, and is the gravitational acceleration. Since the pipes are of the same length and have the same Darcy friction factor, and the internal diameter of pipe ‘B’ is twice that of pipe ‘A’, the ratio of the head loss in pipe ‘A’ to that in pipe ‘B’ is: Thus, the ratio of the head loss in pipe ‘A’ to that in pipe ‘B’ is 32.

The specific energy in open channel flow is given by: where:
- is the depth of flow,
- is the velocity of the flow,
- is the acceleration due to gravity.
Given:
- ,
- ,
- .
The specific energy is: Thus, the specific energy for this flow condition is .

First, let's solve for using the given equation. We know: Substitute into the equation: Now, substitute and into the equation to find and . After calculations, we find the ratio: Thus, the value of the ratio is .

(A) Net decrease in standard Gibbs free energy:
In glycolysis, the overall process is exergonic, meaning it results in a net decrease in standard Gibbs free energy, as energy is released. (B) End product is glyceraldehyde 3-phosphate:
While glyceraldehyde 3-phosphate is an important intermediate in glycolysis, the final product of glycolysis is pyruvate, not glyceraldehyde 3-phosphate. (C) First phase includes the phosphorylation of the glucose molecule:
The first phase of glycolysis involves the phosphorylation of glucose to form glucose-6-phosphate, which is correct. (D) Net gain of NADH:
Glycolysis produces a net gain of NADH, as NAD+ is reduced to NADH during the process. Final Answer:

In fabric filtration, small particles with diameters less than 10 µm are primarily removed through mechanisms such as impaction, interception, and diffusion:
- Impaction occurs when particles in the gas stream collide with the fibers of the filter and get trapped.
- Interception happens when particles are intercepted by fibers as they flow through the filter.
- Diffusion is the process where smaller particles, influenced by Brownian motion, move randomly and are more likely to encounter and adhere to the fibers.
Gravitation (option B) is not a significant mechanism for particles smaller than 10 µm, as their small size makes them less likely to be affected by gravity. Therefore, the correct answer is (A), (C), and (D).
Final Answer:

Nitrifying bacteria, such as those in the genus Nitrobacter, are autotrophic organisms. They obtain their energy from inorganic compounds, specifically by converting ammonia or nitrite into nitrate. This process is essential in the nitrogen cycle. They are not eukaryotes, and their energy conversion does not involve mitochondria as in eukaryotic cells. Therefore, the correct answer is (A).
Final Answer:

Step 1: Understanding Lichens
Lichens are a symbiotic relationship between fungi and algae (or cyanobacteria). The fungi provide a structure and absorb water and minerals from the environment, while the algae (or bacteria) perform photosynthesis to produce food.
Step 2: Analyzing the Options
Option (A) is incorrect because lichens are a symbiotic association between fungi and algae, not fungi and bacteria.
Option (B) is incorrect because the symbiotic relationship in lichens involves algae, not bacteria, for food generation.
Option (C) is correct because lichens are very sensitive to air pollution, as the algae within them can be harmed by pollutants.
Option (D) is correct because lichens are formed by the symbiotic relationship between fungi and algae, where the fungi absorb water and minerals, and the algae generate food via photosynthesis.
Thus, the correct answers are (C) and (D).

Step 1: Understanding the process of nitrification.
Nitrification occurs in two stages:
Ammonia (NH₃) is converted to nitrite (NO₂⁻) by the bacterium {Nitrosomonas}.
Nitrite (NO₂⁻) is further oxidized to nitrate (NO₃⁻) by the bacterium {Nitrobacter}.
Step 2: Analyzing the statements.
Statement (i): Incorrect. Both {Nitrosomonas} and {Nitrobacter} use oxygen as their electron acceptor, thus the electron acceptor is consistent for both.
Statement (ii): Incorrect. Nitrification primarily utilizes inorganic carbon (CO₂) rather than organic carbon sources.
Statement (iii): Correct. The primary carbon source in nitrification is inorganic carbon (CO₂).
Statement (iv): Correct. Ammonium ions act as the electron donor in the conversion of ammonium to nitrite.
Step 3: Final Conclusion.
The accurate statements are (iii) and (iv), so the correct answer is both (A) and (C).

Step 1: Understanding the Basel Convention
The Basel Convention is an international treaty aimed at reducing the movement of hazardous waste between nations, specifically from developed to developing countries. This treaty was adopted to protect human health and the environment from the harmful effects of hazardous waste.
Step 2: Analyzing the Options
Option (A) talks about all nations assembling for a common environmental problem, but the Basel Convention focuses specifically on hazardous waste management.
Option (B) discusses CO2 and CH4 emissions, which are related to global warming but are not the focus of the Basel Convention.
Option (C) focuses on acidic gases causing acid rain, which is not the primary focus of the Basel Convention either.
Option (D) is the correct one because the Basel Convention specifically deals with the trans-boundary movement of hazardous wastes.
Thus, the correct answer is (D).