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May 2022

Home2022MayPage 7

Assertion : A person sitting in an artificial satellite revolving around the earth feels weightless. Reason : There is no gravitational force on the satellite.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : For a satellite revolving very near to earth’s surface the time period of revolution is given by 1 hour 24 minutes. Reason : The period of revolution of a satellite depends only upon its height above the earth’s surface.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

The stem of female Cycas plant is a

(a)  Monopodium                    (b)  Sympodium (c)   Rhizomatous                     (d)  Dichotomous Ans. a   (13)

Assertion : If earth were a hollow sphere, gravitational field intensity at any point inside the earth would be zero. Reason : Net force on a body inside the sphere is zero.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Cycas circinalis is a source of

(a)  Resin                                  (b)  Timber (c)   Essential oil                       (d)  Starch (Sago) Ans. d (10)

Vascular bundles of Cycas stem are

(a)  Conjoint (b)  Collateral and closed (c)   Conjoint, collateral and open (d)  Conjoint, collateral and closed Ans. c (8)

Leaves in Cycas show

(a)  Hydrophobic characters (b)  Xerophytic characters (c)   Mesophytic characters (d)  Lithophytic characters Ans. b (12)

51. Number of ovules present on megasporophyll of Cycas is

(a)  Only one                            (b)  One pair (c)   1 – 6 pairs                          (d)  Absent Ans. c (93)

In Cycas

(a)  Male strobilus and megasporophylls occurs on the same individual (b)  The same cone consists of both micro and megasporophylls...

Secondary wood of Cycas is devoid of

(a)  Tracheids                           (b)  Vessels (c)   Protoxylem                    (d)   Metaxylem Ans. b...

Male and female Cycas plants show which type of growth

(a)  Monopodial in both (b)  Sympodial in both (c)   Monopodial in male and sympodial in female plant (d)  Sympodial in...

Which species of Cycas is having largest male cones

(a)  Cycas revoluta                   (b)  C. rumphii (c)   C. circinalis                        (d)  C. beddomei Ans. c (16)

The secondary growth in stem of Cycas is brought about by

(a)  Persistant cambium (b)  Short lived cambium (c)   Number of cambia produced in succession (d)  Isolated strips of cambium Ans....

Ptyxis in Cycas is

(a)  Simple                                (b)  Circular (c)   Circinate                            (d)  None of these Ans. c (7)

Assertion : If earth suddenly stops rotating about its axis, then the value of acceleration due to gravity will become same at all the places. Reason : The value of acceleration due to gravity is independent of rotation of earth.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Transfusion tissue, a modified vascular tissue is present in the leaves of

(a)  Pinus                                  (b)  Dryopteris (c)   Lycopodium                       (d)  Dalbergia Ans. a (15)

Assertion : We can not move even a finger without disturbing all the stars. Reason : Every body in this universe attracts every other body with a force which is inversely proportional to the square of distance between them.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Coralloid roots of Cycas are useful in

(a)  N2-fixation                         (b)  Absorption (c)   Transpiration                    (d)  Fixation Ans. a (34)

Fern character in Cycas is

(a)  Coralloid roots                  (b)  Tap root system (c)   Circinate venation            (d)  Reticulate venation Ans. c (45)

Assertion : The binding energy of a satellite does not depend upon the mass of the satellite. Reason : Binding energy is the negative value of total energy of satellite.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

In which plant largest sperms are found

(a)  Cycas                                  (b)  Pinus (c)   Mango                                (d)  Sunflower Ans. a (10)

Diploxylic or polyxylic vascular bundles are found in

(a)  Pinus                                  (b)  Dryopteris (c)   Cycas                                  (d)  Funaria Ans. c (5)

Assertion : Space rockets are usually launched in the equatorial line from west to east. Reason : The acceleration due to gravity is minimum at the equator.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : A body becomes weightless at the centre of earth. Reason : As the distance from centre of earth decreases, acceleration due to gravity increases.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Generally the path of a projectile from the earth is parabolic but it is elliptical for projectiles going to a very large height. Reason : The path of a projectile is independent of the gravitational force of earth.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : When distance between two bodies is doubled and also mass of each body is also doubled, gravitational force between them remains the same. Reason : According to Newton’s law of gravitation, force is directly proportional to mass of bodies and inversely proportional to square of distance between them.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The time period of revolution of a satellite close to surface of earth is smaller than that revolving away from surface of earth. Reason : The square of time period of revolution of a satellite is directly proportional to cube of its orbital radius.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : Two different planets have same escape velocity. Reason : Value of escape velocity is a universal constant.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Assertion : The principle of superposition is not valid for gravitational force. Reason : Gravitational force is a conservative force

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

The wing in Pinus seed originates from

(a)  Integument (b)  Adaxial surface of ovuliferous scale (c)   Bract scale (d)  Cone axis Ans. b (13)

Seed of Pinus shows three generations as

(a)  Parent sporophyte, gametophyte and future sporophyte (b)  Parent gametophyte, sporophyte and future gametophyte (c)   Parent sporophyte, sporophyte, future gametophyte...

Assertion : The time period of geostationary satellite is 24 hours. Reason : Geostationary satellite must have the same time period as the time taken by the earth to complete one revolution about its axis.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

In Pinus male gametes are produced in the pollen tube by the division of which of the following cells

(a)  Body cell                            (b)  Stalk cell (c)   Tube cell                            (d)  Prothallial cell Ans. a (6)

Assertion : Earth has an atmosphere but the moon does not. Reason : Moon is very small in comparison to earth.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

Pinus is

(a)  Deciduous                         (b)  Dioecious (c)   Monoecious                       (d)  None of these Ans. c (21)

Assertion : If an earth satellite moves to a lower orbit, there is some dissipation of energy but the satellite speed increases. Reason : The speed of satellite is a constant quantity.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

14. Assertion : Orbital velocity of a satellite is greater than its escape velocity. Reason : Orbit of a satellite is within the gravitational field of earth whereas escaping is beyond the gravitational field of earth.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

The seed of Pinus sp. is

(a)  Uneconomic and nonendospermic (b)  Abaxial and rounded (c)   Adaxial and endospermic (d)  Hypogeal and monocotyledonous Ans. c (14)

Assertion : A planet moves faster, when it is closer to the sun in its orbit and vice versa. Reason : Orbital velocity in orbital of planet is constant.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...

In Pinus male and female reproductive structures occur

(a)  On different branches of the same plant (b)  On different plants (c)   On same branch (d)  None of these...

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