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351.

How do the stomata of dicots and monocots differ ?

Answer» In dicots the guard cells are kidney-shaped, while they are dumb-bell -shaped in monocots
352.

Which type of flowers are usually found in monocots and dicots ?

Answer» Trimerous flowers in monocots, and pentamerous flowers in dicots
353.

The lowest cell of suspensor is calledA. vesicleB. radicleC. hypophysisD. root cap

Answer» Correct Answer - C
354.

Are the particles of the solute present in true solution visible to the naked eye ?

Answer» Correct Answer - No.
355.

Which of the following plant tissues generally have oval or spherical and thin-walled cells ?A. CollenchymaB. SclerenchymaC. ParenchymaD. None of these

Answer» Correct Answer - C
356.

The upper lip pf cockroach is calledA. maxillaB. stipesC. mandibleD. ligula

Answer» Correct Answer - C
357.

The total number of segments comprising head and thorax in cockroach isA. 6B. 3C. 9D. 8

Answer» Correct Answer - C
358.

The most distant part of the leg of a cockroach isA. coxaB. tibiaC. troachanterD. Tarsus

Answer» Correct Answer - D
359.

The heart of a cockroach isA. ventrally placedB. tubularC. laterally placedD. four-chambered

Answer» Correct Answer - B
360.

When ` SO_(2)` gas is allowed to react with acidified potassium dichromate solution , the yellow colour of the solution changes to green. This is due to the formation ofA. `Cr_(2)O_(3)`B. `Cr_(2)(SO_(4))_(3)`C. `K_(2)SO_(4)`D. `H_(2)SO_(3)`

Answer» Correct Answer - B
361.

Which of these organs of a bird is not found in humas ?A. PectenB. IntestineC. LiverD. Kidney

Answer» Correct Answer - A
362.

Which of the following is the largest bird ?A. PenguinB. OstrichC. PeacockD. Crane

Answer» Correct Answer - B
363.

Keel in the breastbone of a bird serves toA. grasp foodB. digest foodC. attach flight musclesD. perch on the branch

Answer» Correct Answer - C
364.

In which part of the body of a bird would you find pecten ?A. EyeB. NoseC. LegD. Ear

Answer» Correct Answer - A
365.

Compared to the onion peel cells, cheek cells are more irregular in shape due toA. presence of cell membraneB. lack of large vacuoleC. Lack of cell wallD. lack of plastids

Answer» Correct Answer - C
366.

What kind of cells are the human cheek cells ?A. Dead animal cellsB. Living animal cellsC. Cells without nucleusD. All of these

Answer» Correct Answer - B
367.

If the cheek cells are placed on a dirty slide , what do we observe under the microscope ?A. Cells appear colouredB. Cells show stainingC. Cells are not visible clearlyD. None of these

Answer» Correct Answer - C
368.

Why is the flat end of a sterile toothpick used to scrape the inside surface of the cheek ?A. To prevent injury and infectionB. To get more cellsC. To avoid salivaD. All of these

Answer» Correct Answer - A
369.

Which of the following statements is correct regarding the particles of a solute that get dissolved in a solvent ?A. They can be separated by filtrationB. They cannot be seen under a microscopeC. They settle down at the bottom of the vessel when the solution is left undisturbedD. They scatter a beam of light

Answer» Correct Answer - A
370.

Which of the following statements is correct regarding the particles of a solute that get dissolved in a solvent ?A. They can be separated by filtration .B. They cannot be seen under a microscope.C. They settle down at the bottomm of the vessel when the solution is left undisturbed .D. They scatter a beam of light .

Answer» Correct Answer - B
371.

If the cheek cells are placed on a dirty slide, what do we observe under the microscope ?A. Cells appear colouredB. Cells show stainingC. Cells are not visible clearlyD. None of these

Answer» Correct Answer - C
372.

Which of the following is a partially permeable membrane in a cell ?A. Cell wallB. cytoplasmC. Cell membraneD. All of these

Answer» Correct Answer - C
373.

The membrane which allows the solvent molecules to pass through it and not the solute molecules is calledA. impermeable membraneB. semipermeable membraneC. permeable membraneD. none of the above

Answer» Correct Answer - B
374.

The region between the nucleus and cell membrane in a cheek cell is occupied byA. protoplasmB. cytoplasmC. vacuoleD. None of these

Answer» Correct Answer - B
375.

Spirogyra representsA. multicellular organisationB. filamentous algaeC. photosynthetic aquatic organismD. All of these

Answer» Correct Answer - D
376.

A partially permeable membrane of a cell facilitates the process ofA. diffusionB. plasmolysisC. osmosisD. imbibition

Answer» Correct Answer - C
377.

Which of the following processes is used to separate the components of a mixture of sulphur and charcoal ?A. EvaporationB. DistillationC. FiltrationD. Dissolution in carbon disulphide

Answer» Correct Answer - C
378.

A raisin placed in a concentrated salt solution, shrinks becauseA. salt enters its cellsB. water comes out of its cells to establish an equilibriumC. the cytoplasm of its cells begins to decomposeD. salt comes out of its cells

Answer» Correct Answer - B
379.

A raisin placed in a concentrated salt solution, shrinks becauseA. slat enters its cellsB. water comes out of its cells to establish an equilibriumC. the cytoplasm of its cells begins to decomposeD. salt comes out of its cells

Answer» Correct Answer - B
380.

Spirogyra is an example ofA. blue-green algaeB. brown algaeC. red algaeD. green algae

Answer» Correct Answer - D
381.

A student soaked 5 g of raisins in beaker (A) containing 25mL of ice-chilled water and another 5 g of raisins in beaker (B) containing 25 mL of tap water at room temperature. After one hour the student observed that:A. The raisins in ice-chilled water will absorb more water than the raisins in tap waterB. The raisins in tap water will absorb more water than the raisins in ice-chilled waterC. The amounts of water absorbed by the raisins in both the conditions will be equalD. No water will be absorbed by the raisins in either condition .

Answer» Correct Answer - B
382.

During the melting of ice, temperature .A. decreasesB. increasesC. remains fixedD. first increases then decrease

Answer» Correct Answer - C
383.

Binary fission takes place inA. unfavourable conditionsB. favourable conditionsC. hot conditionsD. all conditions

Answer» Correct Answer - B
384.

Define binary fission

Answer» Binary fission is the division of a single parent cell into two similar daughter cells .
385.

When water freezes into iceA. temperature increasesB. temperature decreasesC. heat is absorbedD. heat is released

Answer» Correct Answer - D
386.

A student soaked 5 g of raisins in beaker (A) containing 25mL of ice-chilled water and another 5 g of raisins in beaker (B) containing 25 mL of tap water at room temperature. After one hour the student observed that:A. The raisins in ice-chilled water will absorb more water than the raisins in tap water.B. The raisins in tap water will absorb more water thant the raisins in ice-chilled water.C. The amounts of water absorbed by the raisins in both the conditions will be equal .D. No water will be absorbed by the raisins in either condition.

Answer» Correct Answer - B
387.

During binary fission nucleus dividesA. amitoticallyB. mitoticallyC. meioticallyD. none of these

Answer» Correct Answer - A
388.

Binary fission is the mode of reproduction inA. AlgaeB. FungiC. AmoebaD. yeast

Answer» Correct Answer - C
389.

Which organelle divides first during binary fission ?

Answer» Correct Answer - Nucleus
390.

The boiling point of water at 1 atmospheric pressure isA. `100^(@)`B. `0^(@)`CC. `100.5^(@)` CD. `-5^(@)` C

Answer» Correct Answer - A
391.

The temperature at which a liquid starts boiling is calledA. its melting pointB. its freezing pointC. its boiling pointD. none of these

Answer» Correct Answer - C
392.

The boiling point of water at 1 atmospheric pressure isA. `100^(@)C `B. `0^(@)C`C. `100.5^(@)C `D. `-5^(@)C `

Answer» Correct Answer - A
393.

The temperature at which liquid starts boiling is calledA. its melting pointB. its freezing pointC. its boiling pointD. none of the above

Answer» Correct Answer - C
394.

Name the type of nuclear division that occurs during binary fission

Answer» Correct Answer - Amitosis
395.

When water freezes into iceA. Temperature increases.B. temperature decreasesC. heat is absorbedD. heat is released

Answer» Correct Answer - D
396.

Which of the following is not a homogeneous mixture ?A. Aqueous solution of sugarB. Aqeous solution of common saltC. Oil mixed with waterD. Limewater

Answer» Correct Answer - B
397.

Does sulphur present in ferrous sulphide dissolve in carbon disulphide ?

Answer» Correct Answer - No.
398.

A mixture of iron filings and sulphur is treated with a solvent in which sulphur dissolves . Name the solvent .A. WaterB. HoneyC. MilkD. Carbon disulphide

Answer» Correct Answer - D
399.

Which of the following does make a homogeneous mixture ?A. Fine sand in waterB. Sugar in waterC. soil in waterD. Powdered marble in water .

Answer» Correct Answer - B
400.

A mixture of iron filings and sulphur is treated with a solvent in which sulphur dissolves. Name the solvent.A. WaterB. HoneyC. MilkD. Carbon disulphide

Answer» Correct Answer - A