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May 2022

Home2022MayPage 8

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)

The seed of Pinus represents

(a)  One generation                 (b)  Two generations (c)   Three generations            (d)  Four generations Ans. c (8)

The correct graph representing the variation of total energy

The correct graph representing the variation of total energy  (Et )kinetic energy  (Ek )and potential energy (U) of a satellite...

A microsporophyll in Pinus has

(a)  One microsporangium on the adaxial side (b)  One microsporangium on the abaxial side (c)   Two microsporangia on the abaxial...

Winged pollen grain is the characteristic feature of

(a)  Cycas                                  (b)  Ephedra (c)   Gnetum                              (d)  Pinus Ans. d (9)

The wood of pinus is

(a)  Pycnoxylic and monoxylic (b)  Pycnoxylic and heteroxylous (c)   Manoxylic and homoxylous (d)     Manoxylic and heteroxylous Ans. a (15)

5. Assertion : If a pendulum is suspended in a lift and lift is falling freely, then its time period becomes infinite. Reason : Free falling body has acceleration equal to acceleration due to gravity.

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

Time lapse between fertilization and seed formation in Pinus is

(a)  6 years                               (b)  2 years (c)   1 ½ years                          (d)  1 year Ans. d (12)

Assertion : The value of acceleration due to gravity does not depend upon mass of the body on which force is applied. Reason : Acceleration due to gravity is a constant quantity.

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

Assertion : The universal gravitational constant is same as acceleration due to gravity. Reason : Gravitational constant and acceleration due to gravity have same dimensional formula.

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

The microsporophylls of Pinus has

(a)  Many microsporangia (b)  No microsporangia (c)   2 microsporangia (d)  Only one microsporangium Ans. c (12)

Assertion : Gravitational force between two particles is negligibly small compared to the electrical force. Reason : The electrical force is experienced by charged particles only.

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

1. Assertion : Smaller the orbit of the planet around the sun, shorter is the time it takes to complete one revolution. Reason : According to Kepler’s third law of planetary motion, square of time period is proportional to cube of mean distance from sun.

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

Annual rings are well seen in

(a)  Selaginella stem                (b)  Cycas wood (c)   Pinus wood                        (d)  All the above Ans. c (12)

Which of the following tissue is present in the leaves of Pinus and serve to conduct water and food

(a)  Xylem                                 (b)  Phloem (c)   Transfusion tissue            (d)  Conducting tissue Ans. c   (14)

The winged pollen grain of Pinus sp. are produced in

(a)  Pollen chamber                (b)  Anther (c)   Tapetum                            (d)  Microsporangium Ans. d (12)

The part of the ovule in the Pinus which has megaspore mother cells dividing to form haploid megaspores is

(a)  Nucellus                             (b)  Embryo (c)   Gametangia                       (d)  Gametophore Ans. a (9)

Pinus shows

(a)  Heterospory                      (b)  Polyembryony (c)   Homospory                        (d)  One type of branching Ans. b (6)

Microsporophyll of Pinus is equivalent to

(a)  Pollen grain of angiosperms (b)  Stamen (c)   Male gametophyte (d)  Inflorescence Ans. d (21)

Female cone of Pinus can be compared to which part of the plant

(a)  Flower                                (b)  Megasporophyll (c)   Inflorescence                    (d)  Microsporophyll Ans. c (10)

The curves for potential energy (U) and kinetic energy

The curves for potential energy (U) and kinetic energy  (Ek) of a two particle system are shown in figure. At...

Pinus seed shows

(a)  Hypogeal germination (b)  Epigeal germination (c)   Dormancy (d)  None of the above Ans. b (6)

Pinus shows

(a)  Simple polyembryony (b)  Cleavage polyembryony (c)   Both simple and cleavage polyembryony (d)  None of the above Ans. c (14)

Endosperm of Pinus is

(a)  Male gametophyte            (b)  Female gametophyte (c)   Sporophyte                       (d)  None of the above Ans. b (8)

In Pinus megaspore on germination forms

(a)  Pollen tube with two motile sperms (b)  Endosperm with archegonia (c)   Endosperm with sperms (d)  Endosperm with embryo sac...

Which of the following graphs represents the motion of a planet moving about the sun

Answer: c (13)
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