May, 2022Flame Institute

The pollination in Pinus is

(a) Entomophilous (b) Anemophilous (c) Hydrophilous (d) Malscophilous Ans. b (12)

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 both assertion and reason are true but reason is not the correct explanation of the assertion. (c) If assertion is …

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 (5)

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

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 (8)

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.

Female cone of Pinus is considered equivalent to

(a) Dwarf shoot (b) Long shoot (c) Needles (d) Scale leaves Ans. b (8)

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.

Siphonogamous fertilization takes place in

(a) Bryophytes (b) Selaginella (c) Fern (d) Pinus Ans. d (7)

The giant tree among the pines belongs to

(a) Cedrus (b) Pinus (c) Dalbergia (d) Sequoia Ans. d (9)

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

Plant of pine is

(a) Annual herb (b) Biannual herb (c) Evergreen tree (d) Deciduous tree Ans. c (10)

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 shell of mass M and radius R has a point mass m placed at a distance r from its centre. The gravitational potential energy U (r) vs r will Answer: c (20)

The spur of Pinus occelsa is

(a) Unifoliar (b) Bifoliar (c) Trifoliar (d) Pentafoliar Ans. d (6)

The seed of Pinus represents

(a) One generation (b) Two generations (c) Three generations (d) Four generations Ans. c (6)

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 with its distance from the centre of earth is Answer: c (14)

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 side (d) Two microsporangia on the adaxial side (e) Four microsporangia on the lower side Ans. c (9)