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May 2022

Home2022MayPage 27

All cells of sex organs are formed gametes in

(a)  Algae                                  (b)  Bryophyta (c)   Pteridophyta                     (d)  Gymnosperm Ans.a (8)

Palmella stage is produced

(a)  In rainy season (b)  During unfavourable conditions (c)   During favourable conditions (d)  None of the above Ans. b (10)

Zygospore is

(a)  Haploid                              (b)  Polyploid (c)   Diploid                               (d)  None of the above Ans. c (44)

77. The possible value of Poisson’s ratio is

(a)  1                                     ...

Thermal algae are forms which grow and survive

(a)  In tropical regions where the temperature range is high (b)  In hot water springs where the temperature remains around...

The value of escape velocity on a certain planet is 2 km/s. Then the value of orbital speed for a satellite orbiting close to its surface is

(a)  12 km/s                             (b)  1 km/s (c) √2   km/s                           (d)   2√2   km/s Answer: c (8)

The simplest green plants are

(a)  Yeast                                  (b)  Bacteria (c)   Algae                                  (d)  Lactobacillus Ans.c (7)

Which one of the following statements concerning the algae is wrong

(a)  Most algae are photosynthetic (b)  Algae can be classified according to their pigments (c)   All algae are filamentous (d) ...

23. More than one pyrenoid are present in

(a)  Ulothrix                              (b)  Spirogyra (c)   Oedogonium                       (d)  All the above Ans. d (14)

Algae which form motile colony is

(a)  Volvax                                (b)  Nostoc (c)   Spirogyra                           (d)  Chlamydomonas Ans. b (9)

For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is

(a)   2                                      (b) 1/2 (c)   1/√2                             ...

70. Density of rubber is d. A thick rubber cord of length L and cross-section area A undergoes elongation under its own weight on suspending it. This elongation is proportional to

(a)    dL                                     ...

Assertion : The time of vulcanisation and temperature is increased by adding accelerators. Reason : By vulcanising, a material of high tensile strength can be obtained.

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

155. A solid cube of side l is made to oscillate about a horizontal axis passing through one of its edges. Its time period will be

Ans. a (44)

69. Two wires ‘A’ and ‘B’ of the same material have radii in the ratio 2 : 1 and lengths in the ratio 4 : 1. The ratio of the normal forces required to produce the same change in the lengths of these two wires is

(a)   1 : 1                                 ...

Which among the following do you consider as the best evidence to show that two species of algae are closely related

(a)  They both respire and release CO2 (b)  They both are found in the same habitat (c)   They both reproduce...

The non-motile, greatly thickened asexual spores are called

(a)  Hypnospores                     (b)  Aplanospores (c)   Macrozoospores                (d)  Microzoospores Ans. a (7)

67. When a weight of 10 kg is suspended from a copper wire of length 3 metres and diameter 0.4 mm, its length increases by 2.4 cm. If the diameter of the wire is doubled, then the extension in its length will be

(a)       9.6 cm                                             (b)   4.8 cm (c)   1.2 cm                       ...

22. In biotechnological studies, the alga that is exploited as a rich source of protein is

(a)  Spirogyra                           (b)  Spirulina (c)   Chlamydomonas                (d)  Scytonema Ans. b (11)

154. A disc of radius R is made to oscillate about a horizontal axis passing through its periphery. Its time period would be

(a)     2π√(3R/2g) (b)    2π√(2R/3g (c)     2π√(R/g) (d)     2π√(2R/g) Ans. a (80)

153. A metre scale is suspended vertically from a horizontal axis passing through one end of it. Its time period would be

(a)   1.64 sec (b)  2 sec (c)   2.5 sec (d)  3.2 sec Ans. a (85)

152. In the above problem the angular velocity of the cylinder, after the masses fall down through distance h, will be

(a)      1/R√{(8 mgh)/(M+4m)} (b)     1/R√{8 mgh/(M+m)} (c)      1/R√{mgh/(M+m)} (d)      1/R √{8 mgh/(M+2m)} Ans....

If the radius and acceleration due to gravity both are doubled, escape velocity of earth will become

(a)      11.2 km/s                         (b)  22.4 km/s (c)   5.6 km/s                           ...

If the radius of a planet is four times that of earth and the value of g is same for both, the escape velocity on the planet will be

(a)   11.2 km/s                                  (b)...

An example of agarophyte is

(a)  Dictyota                             (b)  Fucus (c)   Nostoc                                (d)  Gelidium Ans. d (10)

Algal cell wall is composed of

(a)  Chitin                                 (b)  Cutin (c)   Cellulose                            (d)  Suberin Ans. c (9)

Which one is a parasitic algae

(a)  Vaucheria (b)  Polysiphonia (c)   Cephaleuros (d)  Batrachospermum Ans. c (49)

The velocity with which a projectile must be fired so that it escapes earth’s gravitation does not depend on

a)  Mass of the earth (b)  Mass of the projectile (c)   Radius of the projectile’s orbit (d)  Gravitational constant Answer:...

147. A mass M is supported by a mass less string would wound a uniform cylinder of mass M and radius R. On releasing the mass from rest, it will fall with acceleration

(a)    g (b)  g/2 (c)  g/3 (d) 2g/3 Ans. d (9)

The biodegradable polymer is

a. Buna- s b. Nylon-6, 6 c. Nylon 2-nylon 6 d. Nylon- 6 Ans. c (14)

59. Which of the following statements is correct

(a)  Hooke’s law is applicable only within elastic limit (b)  The adiabatic and isothermal elastic constants of a gas are...

If V, R and g denote respectively the escape velocity from the surface of the earth radius of the earth, and acceleration due to gravity, then the correct equation is

(a)    V=√gR                                   (b)  V=√ 4/3...

Gametes formed by meiosis are called

(a)  Coenogametes                  (b)  Meiogametes (c)   Mitogametes                     (d)  None of these Ans. b (28)

A motile flagellated asexual cell is called

(a)  Sperm                                (b)  Zoospore (c)   Oospore                             (d)  Androspore Ans. b (22)

The escape velocity for a body projected vertically upwards from the surface of earth is 11 km/s. If the body is projected at an angle of 45o with the vertical, the escape velocity will be

(a)  ( 11/√2 )km/s                         (b) 11√2km/s (c)   22 km/s                            ...

Fusion of mature individuals which directly act as gametes, is called

(a)  Isogamy                             (b)  Anisogamy (c)   Hologamy                          (d)  Autogamy Ans. c (13)

In physiological anisogamy

(a)  Gametes are morphologically similar but physiologically dissimilar (b)  Gametes are morphologically dissimilar but physiologicaly similar (c)   Gametes are morphologically...

Which one of the following is not a accessory pigment

(a)  Chlorophyll ‘a‘                  (b)  Chlorophyll ‘e‘ (c)   Phycocyanin                      (d)  Xanthophyll Ans. a (8)

Coenobium means

(a)  A hollow spherical colony (b)  A group of filaments (c)   Palmelloid form (d)  None of the above Ans. a...

Iodine is obtained from the members of

(a)  Green algae                       (b)  Brown algae (c)   Red algae                           (d)  Blue–green algae Ans. b (8)

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