Recent questions tagged ch9

Which one of the following yields edible oils?

asked Jul 15, 2014 by sreemathi.v

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Which one of the following yields jute ?

asked Jul 15, 2014 by sreemathi.v

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Protoplasts from different varieties or spices can be fused with the help of

asked Jul 15, 2014 by sreemathi.v

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The first report of successful production of haploid plants from anther culture was made from

asked Jul 15, 2014 by sreemathi.v

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Many of the sugarcane varieties cultivated today are

asked Jul 15, 2014 by sreemathi.v

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A plant which is cultivated by tissue culture technique is

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Mutations can be induced by

asked Jul 15, 2014 by sreemathi.v

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Selection of homozygous plant is

asked Jul 15, 2014 by sreemathi.v

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Modern,bread wheat Triticum aestivum is

asked Jul 15, 2014 by sreemathi.v

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In tissue culture medium,the embryoids formed from pollen grains is due to

asked Jul 15, 2014 by sreemathi.v

2 answers

Haploid plantlets can be produced by

asked Jul 15, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:'Embryo rescue' is culturing of young embryo,fertilised ovule or pollinated ovary.}\\\text{Reason:'Embryo rescue' is performed to protect the development of embryo.}\end{array}$

asked Jul 15, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Our present day crop plants are entirely different from their wild ancestors.}\\\text{Reason:Almost all our present day crops are the result of selections carried out by the prehistoric human beings.}\end{array}$

asked Jul 15, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:To obtain maximum advantage of heterosis,hybrid seeds must be produced every year.}\\\text{Reason:Heterosis is lost by inbreeding.}\end{array}$

asked Jul 15, 2014 by sreemathi.v

1 answer

Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Somatic tissues formed embryoids by tissue culture technique.}\\\text{Reason:Embryoids look like normal seed embryos.}\end{array}$

asked Jul 15, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Somaclonal variations occur in tissue culture processes.}\\\text{Reason:Variations cannot occur in nature.}\end{array}$

asked Jul 15, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Virus-free plants can be produced from virus infected plants by means of meristems tissue culture .}\\\text{Reason:The virus fails to grow during the growth of host tissue in the artificial medium.}\end{array}$

asked Jul 15, 2014 by sreemathi.v

1 answer

Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Protoplast fusion is one of the major advantages of tissue culture.}\\\text{Reason:The naked protoplasts of two different plants fuse of form a hybrid.}\end{array}$

asked Jul 15, 2014 by sreemathi.v

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Given the Assertion and Reason below, Choose one of the following responses $\begin{array}{1 1}\text{Assertion:Cloning is also known as 'Micropropagation'.}\\\text{Reason:This technique is helpful in propagating many valuable and commercially useful plants.}\end{array}$

asked Jul 15, 2014 by sreemathi.v

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Removal of stamens in an inter-sexual flower before they dehisce is called

asked Jul 15, 2014 by sreemathi.v

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Which of the following is/are the aspects of crop improvements?

asked Jul 15, 2014 by sreemathi.v

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Which one of the following yields edible oils?

asked Jul 15, 2014 by sreemathi.v

1 answer

Which one of the following yields jute?

asked Jul 15, 2014 by sreemathi.v

1 answer

Protoplasts from different varieties or species can be fused with the help of

asked Jul 15, 2014 by sreemathi.v

1 answer

The first report of successful production of haploid plants from anther culture was made from

asked Jul 15, 2014 by sreemathi.v

1 answer

Many of the sugarcane varieties cultivated today are

asked Jul 15, 2014 by sreemathi.v

1 answer

Mutations can be induced by

asked Jul 15, 2014 by sreemathi.v

1 answer

Modern,bread wheat Triticum aestivum is

asked Jul 15, 2014 by sreemathi.v

1 answer

A water tank is constructed on the top of a building with what speed will the water come out of a tank 8m below the water level the tank?Assume steady flow and that the pressure above the water level is equal to $P_{atm}$.

asked May 12, 2014 by sreemathi.v

1 answer

The profile of a dam is an arc of a circle,the arc having a radius of 30m and subtending an angle of $60^{\large\circ}$ at the centre of curvature which lies in the water surfaces.Determine the load on the dam in N/m

asked May 12, 2014 by sreemathi.v

1 answer

A tank with vertical sides is square in plane with 3m long sides.The tank contains oil of relative density 0.9 to a depth of 2.0m which is floating on water a depth of 1.5m.Calculate the force on the walls.(Consider one wall of the tank).

asked May 12, 2014 by sreemathi.v

1 answer

A closed tank has an orifice $0.025m$ diameter in one of its vertical sides.The tank contains oil to a depth of 0.61m above the centre of the orifice and the pressure in the air space above oil is maintained at $13780N/m^2$ above atmospheric.What is the discharge from the orifile.(Coefficient of discharge of the orifice is 0.61 relative density of oil is 0.9)

asked May 12, 2014 by sreemathi.v

1 answer

The face of a dam is vertical to a depth of 17m below the water surface from slopes at $60^{\large\circ}$ to the vertical.If the depth of water is 7.5m.What is the $F_{resultant}$ on the whole face?

asked May 9, 2014 by sreemathi.v

1 answer

What height would a water barometer need to be to measure atmospheric pressure?

asked May 9, 2014 by sreemathi.v

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At what depth below the surface of oil,relative density 0.8,will produce a pressure of $120KN/m^2$?

asked May 9, 2014 by sreemathi.v

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What will the absolute pressure of water at depth 12m below the surface?$(\rho_{water}=1000Kg/m^3,P_{atm}=101KN/m^2)$

asked May 9, 2014 by sreemathi.v

1 answer

Water flows in a horizontal tube as shown in figure.The pressure of water changes by $600N/m^2$ between A and B where the areas of cross section are $30cm^2$ and $15cm^2$ respectively.Find the rate of flow of water through the tube

asked May 9, 2014 by sreemathi.v

1 answer

A metal piece of mass 160g lies in equlibrium inside a glass of $H_2O$.The piece touches the bottom of the glass at a small number of points.If the density of the metal is $8000Kg/m^3$.Find the normal force exerted by the bottom of the glass on the metal piece

asked May 9, 2014 by sreemathi.v

1 answer

The area of cross section of the wider tube shown in figure is $900cm^2$.If the boy standing on the piston weights 45Kg then difference in the levels of water in the two tubes are ($\rho_{water}=1000Kg/m^3)$

asked May 9, 2014 by sreemathi.v

1 answer

In a test experiment on a model aeroplane in a wind tunnel,the flow speeds on the upper and lower surfaces of the wing are $70ms^{-1}$ respectively.What is the lift on the wing if its area is $2.5m^2$?Take the density of air to be $1.3Kgm^{-3}$

asked May 9, 2014 by sreemathi.v

1 answer

A U-tube contains water and methylated spirit separated by mercury.The mercury columns in the two arms are in level with 10cm of water in one arm & 12.5cm of spirit in the other.What is specific gravity of spirit ?

asked May 9, 2014 by sreemathi.v

1 answer

In Milikan's oil drop experiment,what is the terminal speed of an uncharged drop of radius $2\times 10^{-5}m$ and density $1.2\times 10^3Kgm^{-3}$?Take the viscocity of air at the temperature of the experiment is $1.8\times 10^{-5}pas$.How much is the viscous force on the drop at the speed?Neglect byoyancy of the drop due to air.

asked May 9, 2014 by sreemathi.v

1 answer

What is the pressure inside the drop of mercury of radius 3mm at room temperature?S.T of mercury at that temperature $(20^{\large\circ}C)$ is $4.65\times 10^{-1}Nm^{-1}$.The $P_{atm}=1.01\times 10^4pa$.Also give excess pressure inside the drop

asked May 9, 2014 by sreemathi.v

1 answer

U-shaped wire is dipped in a soap solution,and removed.The thin film formed between the wire and the light slider,supports a weight of $1.5\times 10^{-2}N$(which includes the small weight of the slider).The length of slider is 30cm.What is the surface tension of the film?

asked May 9, 2014 by sreemathi.v

1 answer

From the figure below,(A) & (B) refer to the study of flow of a (non-viscous) liquid.Which of the two figures is incorrect?($P_1$ & $P_2$ represents pipe)

asked May 9, 2014 by sreemathi.v

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There is a small hole near the botttom of an open tank filled with a liquid.The speed of water ejected does not depend on

asked May 9, 2014 by sreemathi.v

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The three vessels shown in figure below have same base area.Equal volume of a liquid are passed in the three vessels.The force on the base will be

asked May 9, 2014 by sreemathi.v

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Equal mass of three liquids are kept in three identical cylindrical vessel A,B and C.The densities are $\rho_A,\rho_B,\rho_C$ with $f_A < f_B < f_C$.The force on the base will be

asked May 9, 2014 by sreemathi.v

1 answer

A wooden object floats in $H_2O$ kept in beaker.The object is near a side of the beaker (given in diagram).Let $P_1,P_2,P_3$ be the pressures at the three points $A,B$ and $C$ of the bottom as shown in figure.

asked May 9, 2014 by sreemathi.v

1 answer

Water is flowing through a long horizontal tube.Let $P_A$ & $P_B$ be the pressures at two horizontal points A and B of the tube.

asked May 9, 2014 by sreemathi.v

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