Explanation

Sea water, water that makes up the oceans and seas, covering more than 70 percent of Earth's surface.

Explanation

An enzyme is a biological catalyst and is almost always a protein.

Enzymes are organic catalysts. 

A large protein enzyme molecule is composed of one or more amino acid chains called polypeptide chains. 

******

Explanation

A residual-current device (RCD) is widely used in electrical circuits for shock safety.

It detects leakage currents and disconnects the circuit to prevent electric shocks.

Explanation

Sunlight entering the water may travel about 1,000 meters into the ocean under the right conditions,

but there is rarely any significant light beyond 200 meters.

The ocean is divided into three zones based on depth and light level.

The upper 200 meters of the ocean is called the euphotic, or "sunlight," zone

ND5-07-2023

Explanation

Three basic parts of an atom

1.   Electrons,

2.   Protons,

3.   Neutrons.

ND5-07-2023

Explanation

The enzyme that synthesizes DNA,

DNA polymerase can only add nucleotides to an already existing strand or primer of DNA or RNA that is base paired with the template.

ND5-07-2023

Explanation

Salinity in seawater is defined as the total  weight of salt dissolved  in 1 kilogram of seawater.

Salinity is expressed in  g / kg and is often expressed in ppt (parts per 1000) or ‰ (permit).

Explanation

Vitamin K is found in the following foods: Green leafy vegetables.

Vegetables such as Brussels sprouts, broccoli, cauliflower, and cabbage.

Fish, liver, meat, eggs, and cereals.

Green leafy vegetables and intestinal bacteria are good source of vitamin K

Explanation

The loudness of a sound depends on the Amplitude of the vibration

 Loudness is proportional to the square of the amplitude

if the amplitude is increased by three times, the loudness also increases by nine times.

*****

ND4-12-2022

Explanation

Infrared radiation is strongly absorbed by water and by the atmosphere.

Although invisible to the eye, infrared radiation can be detected as warmth by the skin.

Nearly 50 percent of the Sun's radiant energy is emitted in the infrared region of the electromagnetic spectrum, with the rest primarily in the visible region.

Explanation

Darwinism is a theory of biological evolution developed by the English naturalist Charles Darwin

Darwin's theory of evolution, also called Darwinism, can be further divided into 5 parts:

"evolution as such",

common descent,

gradualism,

population speciation,

and natural selection.

***

There are four principles at work in evolution—

variation,

inheritance,

selection

and time.

ND11-07-2023

Explanation

The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the crust is the thinnest layer of the Earth, amounting for less than 1% of our planet's volume.

Explanation

The force is acting along the y-axis only, so it has no component along the z-axis.

Answer: 0 N

Explanation

The energy equivalent of 1 atomic mass unit (a.m.u) is given by Einstein's mass-energy equivalence formula E = mc².

1 a.m.u = 931 MeV/c², so the energy equivalent is 931 MeV.

Explanation

An electric generator works on the principle of electromagnetic induction.

Faraday's law states that a changing magnetic flux induces an emf, which is the working principle of generators.

Explanation

Magnetic flux linked (Φ) is proportional to the number of turns in the coil.

Doubling the number of turns doubles the total flux linked, assuming the magnetic field and area remain the same.

Explanation

Explanation

The transfer of thermal energy from one substance to another that requires no physical medium is called radiation.

Radiation is the process by which thermal energy (heat) is transferred through electromagnetic waves, such as infrared radiation. 

They can occur in a vacuum, such as in the transfer of heat from the Sun to the Earth.

Unlike conduction and convection, which require a physical medium (solids, liquids, or gases), 

Explanation

 An electric generator is a device that converts mechanical energy into usable electrical energy.

This process is based on the principle of electromagnetic induction,

Discovered in 1831 by British scientist Michael Faraday

Explanation

Ibn al-Haytham presented the theory of reflection and refraction of light

He is also known as Alhazen

His work, particularly his "Book of Optics", is titled Kitab al-Manazir, written during 1011–1021.

Born: c. 965 (c. 354 AH) Basra, Buyid Emirate

Died: c. 1040 (c. 430 AH)[1] (aged around 75) Cairo, Fatimid Caliphate

Explanation

A dipole in an electric field behaves in two ways:

• In a uniform electric field:

The two equal and opposite forces cancel each other out.

So, the net force on the dipole is zero.

But a torque is produced that tends to align the dipole moment parallel to the electric field.

• In a non-uniform electric field:

The dipole does experience a net force, and that force is generally not simply parallel to the field.

So the correct answer remains:

(D) None of these — because in a uniform electric field, the net force on a dipole is zero.

Option (C) would be correct only if we were talking about torque direction or net force in a non-uniform field.

Explanation

The output voltage of transformer is greater than input voltage.

then it is known as step up transformer.

Explanation

Group IIA elements (alkaline earth metals) have 2 electrons in their outermost s-orbital.

Their general electronic configuration ends with ns², where n is the period number.

Explanation

The kinetic molecular theory states that gases are made up of small particles called molecules.

These molecules are in constant random motion and collide with each other and the container walls.

Explanation

Pyridine has a lone pair on nitrogen that is not involved in resonance, making it readily available for donation.

In aniline and phenol, lone pairs are delocalized into the aromatic ring, reducing basicity.

Explanation

Carbon has 4 electrons in its outer shell.

It forms 4 covalent bonds, making it tetravalent (valency = 4).

Explanation

Explanation

Explanation

Oxyacetylene welding, commonly referred to as gas welding,

is a process which relies on combustion of oxygen and acetylene

Explanation

Polymorphism refers to the occurrence of different forms or morphs among individuals of the same species.

These forms may vary in structure, function, or behavior (e.g., worker and queen ants).

Explanation

A nucleotide, the basic unit of DNA, consists of a 5-carbon sugar (deoxyribose), a nitrogenous base, and a phosphate group.

These components link together to form the DNA's double-helix structure.

Explanation

A strain is when a muscle is stretched too much and part of it tears.

It is also called a pulled muscle.

Explanation

Explanation

Explanation

Explanation

Explanation

Explanation

Explanation

Predator

Carnivores are meat-eating organisms, most often animals.

Carnivores that hunt other animals are called predators.

Hunted animals are called prey.

The animal diet determines where in the food chain, a series of organisms that provide energy and nutrients to other organisms.

Explanation

The main driver of climate change is the greenhouse effect.

Some gases in the Earth's atmosphere act a bit like the glass in a greenhouse, trapping the sun's heat and stopping it from leaking back into space and causing global warming.

Explanation

Scientists know that the core is metal because:

The density of Earth's surface layers is much less than the overall density of the planet, as calculated from the planet's rotation.

The interior must be denser than average if the surface layers are less dense.

Explanation

Solar energy is radiated from the sun in the form of electromagnetic waves of shorter wavelength of 0.2 to 0.4 micrometers.

Out of all the solar energy radiations reaching the earth's atmosphere,

8% is ultraviolet radiation,

40% is visible range light 

46% is by infrared radiation.

Explanation

Cell biology  is a branch of biology that studies the structure, function, and behavior of cells.

All living organisms are made of cells.

also cellular biology or cytology

Explanation

The seat of memory and intelligence in the human brain is the cerebral cortex.

the cerebrum is the part that is designated as the seat of intelligence and voluntary action control. 

while

 cerebellum is part of your brain that helps coordinate and regulate a wide range of functions and processes in both your brain and body.

NA21-8-2023

Explanation

• The Golgi apparatus is a membrane-bound organelle that contains enzymes.
• It is responsible for processing and modifying proteins and lipids synthesized by the endoplasmic reticulum.
• It is a key component of the cellular machinery involved in protein secretion and cell signaling.

Explanation

The most abundant naturally occurring gas is nitrogen (N2), which makes up about 78% of air.

Oxygen (O2) is the second most abundant gas at about 21%.

The inert gas argon (Ar) is the third most abundant gas at 0.93%.

Explanation

Soil fertility can be maintained without adding extra nutrients due to microbial activity.

Microbes increase the amount of nutrients in the soil that are available to plants

Explanation

Most  eucalyptus trees grow much faster than other trees

Some eucalyptus species can grow 6 to 12 feet per year. 

Eucalyptus trees thrive in warm climates with sufficient water and sunlight. 

Eucalyptus trees are widely cultivated for their timber, essential oils, and ornamental value. 

Explanation

Transcription is the process by which the information in a strand of DNA is copied into a new molecule of messenger RNA .

Explanation

Soil pollution can be caused by acid rain.

It is a type of precipitation that contains high levels of sulfuric and nitric acid.

This can occur when fossil fuels are burned, releasing sulfur dioxide and nitrogen oxides into the atmosphere, which then combine with water and oxygen to form acid rain.

Acid rain can alter the pH of the soil, making it more acidic and potentially harmful to plants and microorganisms.