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The continuous excretion of watery subst...

The continuous excretion of watery substance from stump of a well wateredd pot plant after cutting off the shoot slightly aboce the base is due to
Exudation of xylem is due to

A

Root pressure

B

Guttation

C

Transpiration

D

Imbibition

Text Solution

Verified by Experts

The correct Answer is:
A
Root pressure is the transverse osmotic pressure within the cells of a root system that causes sap to rise through a plant stem to the leaves
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A cylindrical container of height 3L and cross sectional area A is fitted with a smooth movable piston of negligible weight. It contains an ideal diatomic gas. Under normal atmospheric pressure P_(0) the piston stays in equilibrium at a height L above the base of the container. The gas chamber is provided with a heater and a copper coil through which a cold liquid can be circulated to extract heat from the gas. Volume occupied by the heater and the liquid coil is negligible. Following set of operations are performed to take the gas through a cyclic process. (1) Heater is switched on. At the same time a tap above the cylinder is opened. Water fills slowly in the container above the piston and it is observed that the piston does not move. Water is allowed to fill the container so that the height of water column becomes L. Now the tap is closed. (2) The heater is kept on and the piston slowly moves up. Heater is switched off at the time water is at brink of overflowing. (3) Now the cold liquid is allowed to pass through the coil. The liquid extracts heat from the gas. Water is removed from the container so as to keep the position of piston fixed. Entire water is removed and the gas is brought back to atmospheric pressure. (4) The circulation of cold liquid is continued and the piston slowly falls down to the original height L above the base of the container. Circulation of liquid is stopped. Assume that the container is made of adiabatic wall and density of water is rho . Force on piston due to impact of falling water may be neglected. (a) Draw the entire cycle on a P–V graph. (b) Find the amount of heat supplied by the heater and the amount of heat extracted by the cold liquid from the gas during the complete cycle.

Optical Fibre: Optical fibre works on the principle of total internal reflection. Light rays can be used to transmit a huge amount of data, but there is a problem here - the light rays travel in straight lines. So unless we have a long straight wire without any bends at all, harnessing this advantage will be very tedious. Instead, the optical cables are designed such that they bend all the light rays' inwards (using TIR). Light rays travel continuously, bouncing off the optical fibre walls and transmitting end to end data. It is usually made of plastic or glass. Modes of transmission: Single-mode fibre is used for long-distance transmission, while multi mode fiber is used for shorter distances. The outer cladding of these fibres needs better protection than metal wires. Although light signals do degrade over progressing distances due to absorption and scattering. Then, optical Regenerator system is necessary to boost the signal. Types of Optical Fibres: The types of optical fibers depend on the refractive index, materials used, and mode of propagation of light. The classification based on the refractive index is as follows: • Step Index Fibres: It consists of a core surrounded by the cladding, which has a single uniform index of refraction. • Graded Index Fibres: The refractive index of the optical fibre decreases as the radial distance from the fibre axis increases. Light signal through optical fibre may degrade due to:

Optical Fibre: Optical fibre works on the principle of total internal reflection. Light rays can be used to transmit a huge amount of data, but there is a problem here - the light rays travel in straight lines. So unless we have a long straight wire without any bends at all, harnessing this advantage will be very tedious. Instead, the optical cables are designed such that they bend all the light rays' inwards (using TIR). Light rays travel continuously, bouncing off the optical fibre walls and transmitting end to end data. It is usually made of plastic or glass. Modes of transmission: Single-mode fibre is used for long-distance transmission, while multi mode fiber is used for shorter distances. The outer cladding of these fibres needs better protection than metal wires. Although light signals do degrade over progressing distances due to absorption and scattering. Then, optical Regenerator system is necessary to boost the signal. Types of Optical Fibres: The types of optical fibers depend on the refractive index, materials used, and mode of propagation of light. The classification based on the refractive index is as follows: • Step Index Fibres: It consists of a core surrounded by the cladding, which has a single uniform index of refraction. • Graded Index Fibres: The refractive index of the optical fibre decreases as the radial distance from the fibre axis increases. Optical fibre works on the principle of:

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Rajeev Lochan Das is the only owner of a shirt manufacturing factory . He took a loan of ₹ 20 lakh from a finance company for expansion of his business . In the beginning his business was running well but later on he started incurring losses and due to continuous losses he was not able to repay the loan . After receiving many reminders from the finance company , Rajeev planned to close the business He sold all his machine and other assets and realised ₹ 15 lakh . He requested the finance company to settle the accounts at ₹ 15 lakh . But the finance company refused , and on his failure to pay the total debt , it filed a case against him in the court . Rajeev gave an argument in the court that he had sold all his business assets , and the loan was taken by him for business , not for his personal use . So the finance company must settle the account at ₹ 15 lakh . The court did not agree with the argument of Rajeev and gave the decision in favour of the finance company . He was ordered to pay full amount of loan by selling off his personal assets . (a) Identify the form of business carried on by Rajeev Lochan Das. (b) State the feature of the form of business identified in (a) which is considered by the court while giving the judgement . (c) State why Rajeev's argument was not correct.