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2022

Home2022Page 49

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...

The pollination in Pinus is

(a)  Entomophilous                 (b)  Anemophilous (c)   Hydrophilous                    (d)  Malscophilous Ans. b (15)

Assertion : Even when orbit of a satellite is elliptical, its plane of rotation passes through the centre of earth. Reason : According to law of conservation of angular momentum plane of rotation of satellite always remain same.

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

In Pinus only lower part of oospore is concerned with the development of embryo, such development is

(a)  Meroblastic                       (b)  Periblastic (c)   Mesoblastic                       (d)  None of these Ans. a (7)

Assertion : Gravitational potential of earth at every place on it is negative. Reason : Every body on earth is bound by the attraction of earth.

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

In Pinus female gametophyte develops only from

(a)  Upper most haploid megaspore (b)  The lower most haploid megaspore (c)   Penultimate megaspore (d)  The 3rd megaspore Ans. b...

Assertion : The ratio of inertial mass to gravitational mass is equal to one. Reason : The inertial mass and gravitational mass of a body are equivalent.

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

Female cone of Pinus is considered equivalent to

(a)  Dwarf shoot                       (b)  Long shoot (c)   Needles                              (d)  Scale leaves Ans. b (10)

Assertion : A force act upon the earth revolving in a circular orbit about the sun. Hence work should be done on the earth. Reason : The necessary centripetal force for circular motion of earth comes from the gravitational force between earth and sun.

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

Siphonogamous fertilization takes place in

(a)  Bryophytes                        (b)  Selaginella (c)   Fern                                   (d)  Pinus Ans. d (9)

The giant tree among the pines belongs to

(a)  Cedrus                                (b)  Pinus (c)   Dalbergia                           (d)  Sequoia Ans. d (11)

Assertion : There is no effect of rotation of earth on acceleration due to gravity at poles. Reason : Rotation of earth is about polar axis

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

Plant of pine is

(a)  Annual herb                      (b)  Biannual herb (c)   Evergreen tree                  (d)  Deciduous tree Ans. c (12)

Assertion : The difference in the value of acceleration due to gravity at pole and equator is proportional to square of angular velocity of earth. Reason : The value of acceleration due to gravity is minimum at the equator and maximum at the pole.

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion. (b)       If...
A shell of mass M and radius R has a point mass m placed at a distance r from its...

The spur of Pinus occelsa is

(a)  Unifoliar                            (b)  Bifoliar (c)   Trifoliar                             (d)  Pentafoliar Ans. d (7)

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