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Process involving movement of substances against the concentration gradient using ATP.

Active transport is the process involving movement of substances against the concentration gradient using ATP. The reason the process is referred... View Article

Name sources of energy that are not ultimately derived from the sun’s energy? a)Bio-mass b)Geothermal energy c)Wind energy d)Nuclear energy

The correct option is d) Nuclear energy The energy that is required for fusing two nuclei is provided by the fission reactions. There is no... View Article

Explain why coils of electric toasters and electric irons made of an alloy rather than a pure metal?

Coils of electric toasters and electric irons made of an alloy rather than a pure metal due to the following reasons: The resistivity of an... View Article

What is the sum of the numbers 6.68 and 0.8?

During addition, the result cannot have more digits to the right of the decimal point than either of the original numbers. Since there is only 1... View Article

How are the alveoli designed to maximize the exchange of gases?

Answer: The human respiratory tract is made up of the nostril, larynx, nasal chamber, pharynx, trachea, epiglottis, alveoli, bronchioles,... View Article

The root mean square (R.M.S.) Speed V of the molecules of an ideal gas is given by the expressions, v = sqrt (3RT/M) and v = sqrt (3KT/m) where R is universal gas constant, T is the absolute (Kelvin) temperature M is the molar mass, K is Boltzman’s constant and M is the molecular mass. The R.M.S. speed of oxygen molecules (O2) at temperature T1 is V1. When the temperature is doubled, if the oxygen molecules are dissociated into atomic oxygen, what will be R.M.S. speed of oxygen atoms? (Treat the gas as ideal).

We have V1 = sqrt (3RT1/M) or V1 = sqrt (3kT1/m) on dissociation the molar mass as well as the molecular mass gets halved. Using the second... View Article

Select the incorrectly matched pair with regard to the C4 cycle. (1) Primary CO2 fixation product – PGA (2) Site of initial carboxylation – Mesophyll cells (3) Primary CO2 acceptor – PEP (4) C4 plant – Maize (5) Location of enzyme RuBisCO – Bundle sheath cells

Answer: (1) Primary CO2 fixation product - PGA The primary CO2 fixation product in C4 plants is oxaloacetic acid, which is converted to malic... View Article

In PCl5, the three P- Cl bonds in plane are called as

For molecules adopting trigonal bipyramidal geometry there are 5 bonds. The three bonds in the plane called planar bonds or equatorial bonds. And... View Article

Under what conditions is the work done i) maximum and ii) minimum?

Work done = FsCosθ Were θ is the angle between Force(F) and displacement(s). (i) Work done will be maximum when Cos θ is maximum, at θ = 0... View Article

Medicines that helps us to get rid of pain are called as:

Medicines that help us to get rid of pain are called as analgesics. Analgesics reduce or abolish pain without causing impairment of... View Article

An electric lamp of 100 Ohms, a toaster of resistance 50 Ohms, and a water filter of resistance 500 Ohms are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?

Given parameters: Resistance of electric lamp (R1) = 100 Ω Resistance of toaster (R2) = 50 Ω Resistance of water filter (R3) = 500 Ω A... View Article

Kingdom Plantae has five divisions. Riccia and Funaria belongs to which category?

Riccia and Funaria are non-vascular plants which are found on land. They require water for survival and reproduction. They are also known as the... View Article

A stone of 1 kg is thrown with a velocity of 20 m s^-1 across the frozen surface of a lake and comes to rest after travelling a distance of 50 m. What is the force of friction between the stone and the ice?

Given The initial velocity of the stone, u= 20 m/s The final velocity of the stone, v= 0 Distance covered by the stone, s= 50 m Find out... View Article

Name the blood vessel that has the lowest concentration of urea.

Urea is excreted out by the kidneys. Therefore, the blood vessel that leaves the kidneys will have the least concentration of urea and other... View Article

Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?

The cabinet will move with constant velocity only when the net force on it is zero. As the velocity of the cabinet is constant, its acceleration... View Article

Answer the following questions on thermionic emission. a. Define Thermionic Emission. b. Mention an application of Thermionic Emission. c. Name a substance that is a good thermionic emitter.

a. The emission of electrons when heat energy is supplied to a metal surface is known as thermionic emission. b. Thermionic emission is used in... View Article

A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits blood group A or O is dominant? Why or why not?

Answer: The dominance of a trait is tested over at least 3 generations. In the above discussed situation, data from only two generation is... View Article

Infants are vaccinated against many diseases. By vaccination their immune system gets

In the process of vaccination, infants immune system is activated so that in next invasion of the causative agent, the body could recognize and... View Article

Why does an ionic compound conduct electricity?

Answer: A solution of ionic compounds in water contains ions, which moves to the opposite electrodes when electricity is passed through the... View Article

Natural phenomenon like fog, mist or frost are caused due to (fill in the blank). a.Evaporation b.Transpiration c.Condensation d.Freezing

Fog, mist or frost are caused due to condensation. Condensation is a process when water is condensed or cooled to form vapour or gas.... View Article

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