May, 2022Flame Institute

89. Under elastic limit the stress is

(a) Inversely, proportional to strain (b) Directly proportional to strain (c) Square root of strain (d) Independent of strain Answer-b (16)

Replicate septum of Spirogyra is characterised by

(a) Ring like growth (b) A peg like protuberance (c) A spiral outgrowth (d) A perforation in the plate Ans. b (21)

Zygotic meiosis takes place in

(a) Selaginella (b) Spirogyra (c) Pinus (d) Brassica Ans. b (9)

A spore of Spirogyra sp. after resting period is

(a) Haploid (b) Diploid (c) Aplanospore (d) Zygospore Ans. a (13)

Reproduction in Spirogyra is

(a) Asexual (b) Conjugation (c) (a) and (b) both (d) None of these Ans. c (5)

Sexual reproduction in Spirogyra is morphologically characterised by

(a) Oogamy (b) Anisogamy (c) Isogamy (d) Isogamy and oogamy both Ans. c (8)

Spirogyra differs from Mucor in having

(a) Uninucleate gametangia (b) Multicellular gametes (c) Anisogamete (d) Sexual reproduction Ans. a (14)

88. The modulus of elasticity is dimensionally equivalent to

(a) Surface tension (b) Stress (c) Strain (d) None of these Answer-b (16)

The zygote containing 4 meiospores in Spirogyra is called

(a) Akinete (b) Parthenospore (c) Incipient sporophyte (d) Chlamydospore Ans. c (6)

87. A force F is applied on the wire of radius r and length L and change in the length of wire is l. If the same force F is applied on the wire of the same material and radius 2r and length 2L, Then the change in length of the other wire is

(a) l (b) 2l (c) l/2 (d) 4l Answer-c (10)

86. In solids, inter-atomic forces are

(a) Totally repulsive (b) Totally attractive (c) Combination of (a) and (b) (d) None of these Answer-c (5)

Unique character of Spirogyra vegetative cell is

(a) Cell wall is definite and thick (b) Cell wall is hygroscopic (c) Pyrenoid bodies are present (d) Nucleus is having cytoplasmic strands Ans. d (6)

The cell wall of Spirogyra is made up of

(a) Cellulose (b) Pectin (c) Lignin (d) Chitin Ans. a (7)

In Spirogyra sometimes the gametes behave directly as zygospores without fusion. Such reproductive bodies are called

(a) Azygospores (b) Hypnospores (c) Zygospores (d) Aplanospores Ans. a (8)

In Spirogyra, ladder like structure is formed in

(a) Lateral conjugation (b) Fragmentation (c) Palmella stage (d) Scalariform conjugation Ans. d (7)

When three Spirogyra filaments are participating in conjugation, the possibilities are that

(a) The middle one may be female and outer ones are male (b) The middle one may be male and outer ones are female (c) Both (a) and (b) (d) None of the above Ans. c (5)

Pyrenoid is found in one of the following part of Spirogyra

(a) Cytoplasm (b) Cell wall (c) Chloroplast (d) Nucleus Ans. c (6)

The sexual reproduction in Spirogyra is

(a) Oogamous (b) Anisogamous (c) Cleistogamous (d) None of the above Ans. d (3)

Spirogyra differs from moss protonema in having

(a) Pyrenoid (b) Branched filament (c) Discoid chloroplast (d) Rhizoidal branches Ans. a (5)

Sexual reproduction in which cells of two different Spirogyra filaments conjugate is known as

(a) Lateral conjugation (b) Scalariform conjugation (c) Parthenocarpy (d) Azygospory Ans. b (7)

In Spirogyra meiosis occurs in

(a) The developing zygospore (b) During conjugation process (c) During vegetative reproduction (d) During gamete formation Ans. a (22)

Chloroplasts of Spirogyra have

(a) Smooth margin (b) Wavy margin (c) Smooth or wavy margin (d) None of the above Ans. b (5)

Pond silk’ is the common name of

(a) Ulothrix (b) Spirogyra (c) Vaucheria (d) Oedogonium Ans. b (10)

Which structure of Spirogyra is flagellated

(a) Physiologically different male gametes (b) Physiologically different female gametes (c) Zygospore (d) None of the above Ans. d (9)

Maximum number of chloroplasts recorded in Spirogyra is

(a) 6 (b) 12 (c) 20 (d) 16 Ans. d (12)

Filaments of Spirogyra are

(a) Uniseriate and unbranched (b) Uniseriate and branched (c) Multiseriate and unbranched (d) Multiseriate and branched Ans. a (23)

Cells of Spirogyra are

(a) Uninucleate (b) Binucleate (c) Multinucleate (d) None of the above Ans. a (6)

Three rods each of length L and mass M are placed along X, Y and Z-axes in such a way that one end of each of the rod is at the origin. The moment of inertia of this system about Z axis is

(a) 2ML2/3 (b) 4 ML2/3 (c) 5 ML2/3 (d) ML2/3 Ans. a (12)

The ratio of the K.E. required to be given to the satellite to escape earth’s gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth atmosphere is

(a) One (b) Two (c) Half (d) Infinity Answer: b (4)

Most primitive members of the plant kingdom are

(a) Thallophytes (b) Bryophytes (c) Pteridophytes (d) Gymnosperms Ans. a (47)

Spirogyra is a

(a) Fresh water and free floating alga (b) Marine and free floating alga (c) Fresh water and locomotory alga (d) None of the above Ans. a (6)

19. Let be the moment of inertia of an uniform square plate about an axis AB that passes through its centre and is parallel to two of its sides. CD is a line in the plane of the plate that passes through the centre of the plate and makes an angle θ with AB . The moment of inertia of the plate about the axis CD is then equal to

(a) l (b) l sin2θ (c) l cos2θ …

Moment of inertia of a uniform circular disc about a diameter is I. Its moment of inertia about an axis perpendicular to its plane and passing through a point on its rim will be

(a) 5 I (b) 6 I (c) 3 I (d) 4 I Ans. b (6)

14. Five particles of mass = 2 kg are attached to the rim of a circular disc of radius 0.1 m and negligible mass. Moment of inertia of the system about the axis passing through the centre of the disc and perpendicular to its plane is

(a) 1 kg m2 (b) 0.1 kg m2 (c) 2 kg m2 (d) 0.2 kg m2 Ans. b (11)

An astronaut orbiting the earth in a circular orbit 120 km above the surface of earth, gently drops a spoon out of space-ship. The spoon will

(a) Fall vertically down to the earth (b) Move towards the moon (c) Will move along with space-ship (d) Will move in an irregular way then fall down to earth Answer: c (3)