Explanation

• A confined aquifer is a water-bearing layer enclosed between two relatively impermeable or low-permeability layers.
• Water is under pressure due to the weight of overlying water and geological conditions.
• When a well penetrates a confined aquifer, water rises in the well to the piezometric level.
• It may rise above the ground surface if the pressure is sufficiently high.

Last verified on 17-10-2026

Explanation

• DNA sequencing determines the precise order of the four DNA bases: adenine (A), thymine (T), guanine (G), and cytosine (C).
• This information helps scientists study genes, identify genetic variations, diagnose inherited disorders, and understand genetic relationships.
• The Human Genome Project, completed in 2003, produced a reference sequence of the human genome.

Last verified on 17-10-2026

Explanation

• Boron (B) is an essential micronutrient required for normal plant growth and development.
• It supports cell-wall formation, sugar transport, pollen germination, and reproductive growth.
• Deficiency: May cause growing-point death, poor flowering, and malformed fruits or growing tissues.
• Excess boron: Can be toxic to plants, causing leaf-tip and leaf-margin burning.

Last verified on 17-10-2026

Explanation

• Waterlogging occurs when the groundwater table rises close to the soil surface, saturating the root zone and reducing the oxygen available to plant roots.

Effective remedial measures include:

• Conjunctive use of water: Using surface water and groundwater together to manage water levels.
• Canal lining: Reducing seepage from canals to limit groundwater recharge.
• Consumptive use of water: Growing suitable crops and managing irrigation to increase water use and reduce excess moisture.

Counter adjacent is not a standard, clearly defined waterlogging-control measure.

Last verified on 17-10-2026

Explanation

• Sugarcane yield is measured in tonnes per hectare (t/ha).
• A yield of 60–70 tonnes per hectare.
• Improved varieties, balanced fertilization, timely irrigation, and effective pest control can increase yield.

Last verified on 17-10-2026

Explanation

• The camshaft has specially shaped projections called cams that push the valves open at the correct time.
• The valve springs help close the valves after the cams release them.
• The camshaft is synchronized with the crankshaft to ensure correct valve timing during the engine cycle.

Last verified on 17-10-2026

Explanation

• The piston moves up and down inside the cylinder during the engine cycle.
• The connecting rod transfers this motion to the crankshaft, which converts it into rotary motion.
• The crankshaft transmits rotational power to other engine components or the transmission system.

Last verified on 17-10-2026

Explanation

• An experimental unit is the basic unit on which a treatment is applied independently.
• In agricultural experiments, an experimental unit may be a small plot of land, a plant, or a group of animals.
• For example, if different fertilizers are tested on separate plots, each plot receiving a fertilizer treatment is an experimental unit.
• The experimental unit is important for proper treatment application, data collection, and statistical analysis.

Last verified on 17-10-2026

Explanation

• Large orifice: The head varies significantly across the opening, so the velocity of water is not uniform over the entire orifice.

Additional information:

• Small orifice: The head is generally considered large compared with the orifice dimension.
• It is commonly H≥5d, so the head variation across the opening can be neglected.
• The classification depends on the head relative to the orifice's vertical dimension.

Last verified on 17-10-2026

Explanation

• Isohyetal Method: Lines called isohyets connect points receiving equal rainfall.
• The area between successive isohyets is measured, and the average rainfall for each zone is used to calculate the weighted average precipitation.
• This method considers the spatial variation of rainfall across the catchment, making it generally more accurate when sufficient rainfall data are available.

Last verified on 17-10-2026