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May 21, 2022

Home2022May21Page 5

In the Chlorophyta, the reserve food of protein surrounded by starch, form a compact body termed

(a)  Paramylum                       (b)  Pyrenoid (c)   Volutin                               (d)  Eye spot Ans. b (10)

Most important alga in research centres is

(a)  Mycoplasma                      (b)  Spirogyra (c)   Chlorella                            (d)  Blue-green algae Ans. c   (13)

Algae differ from Bryophyta in possessing

(a)  Naked sex organs (b)  Sex organs covered with sterile covering (c)   Chlorphylls a andb (d)  Aerobic respiration Ans. a...

Sex organs of thallophytes are generally

(a)  Unicellular (b)  Multicellular surrounded by a sterile jacket (c)   Multicellular but not surrounded by any jacket (d)  Unicellular with...

Plants manufacturing their own food are called

(a)  Epiphytes                          (b)  Parasites (c)   Saprophytes                      (d)  Autotrophs Ans. d (12)

Sexual reproduction in algae results in the formation of

(a)  Oospore                             (b)  Zoospore (c)   Zygote                                (d)  Zygospore Ans. d (16)

Chlamydomonas does not occur in

(a)  Fresh water                       (b)  Pond and lake (c)   River                                  (d)  Ocean Ans. d (10)

Consider a satellite going round the earth in an orbit. Which of the following statements is wrong

(a)      It is a freely falling body (b)  It suffers no acceleration (c)   It is moving with a constant speed...

85. An iron rod of length 2m and cross section area of , stretched by 0.5 mm, when a mass of 250 kg is hung from its lower end. Young’s modulus of the iron rod is

(a) 19.6×1010 N/m2                           (b)  19.6×1015 N/m2 (c)  19.6×1018 N/m2   ...

Smallest plant which contain green pigment such as higher green plant is

(a)  Schizomycetes                  (b)  Rhodophyceae (c)   Chlorophyceae                  (d)  Phaeophyceae Ans. c (14)

84. Which of the following affects the elasticity of a substance

(a)  Hammering and annealing (b)   Change in temperature (c)   Impurity in substance (d)    All of these Answer-d (7)

5. Consider a satellite going round the earth in an orbit. Which of the following statements is wrong

(a)      It is a freely falling body (b)  It suffers no acceleration (c)   It is moving with a constant speed...

Stomata are not found in

(a)  Algae                                  (b)  Mosses (c)   Ferns                                  (d)  Gymnosperm Ans. a (11)

83. If a spring is extended to length l, then according to Hook’s law

(a)  F=kl                                     ...

Marine algae flourished well during which period

(a)  Triassic                              (b)  Devonian (c)   Permian                             (d)  Ordovician Ans. d (16)

An earth satellite of mass m revolves in a circular orbit at a height h from the surface of the earth. R is the radius of the earth and g is acceleration due to gravity at the surface of the earth. The velocity of the satellite in the orbit is given by

(a)   gR2/R+h                                     ...

82. In which case there is maximum extension in the wire, if same force is applied on each wire

(a)  L = 500 cm, d = 0.05 mm (b)   L = 200 cm, d = 0.02 mm (c)   L...

Which of the following is obtained from algae

(a)  Wax                                    (b)  Butter (c)   Chocolate                           (d)  Carragenin Ans. d (11)

The element present in thyroxin is obtained from

(a)  Laminaria                          (b)  Polysiphonia (c)   Porphyra                            (d)  Gelidium Ans. a (8)

Red rust of tea is caused by

(a)  Cephaleuros                       (b)  Synchytrium (c)   Mucor                                 (d)  Fusarium Ans. a (14)

Brown algae is characterised by the presence of

(a)  Phycocyanin                      (b)  Phycoerythrin (c)   Fucoxanthin                      (d)  Haematochrome Ans. c (11)

Select the correct statement from the following

(a)      The orbital velocity of a satellite increases with the radius of the orbit (b)  Escape velocity of a particle...

In which of the following algal classes the starch and oil are present

(a)  Chlorophyceae                  (b)  Phaeophyceae (c)   Rhodophyceae                  (d)  Xanthophyceae Ans. d (10)

If r represents the radius of the orbit of a satellite of mass m moving around a planet of mass M, the velocity of the satellite is given by

(a)   v2 = g(M/r)                                 ...

Amongst plants which one of the following group has been classified on the basis of pigments

(a)  Algae                                  (b)  Fungi (c)   Bryophyta                         (d)  Pteridophyta Ans. a (11)

Pyrenoids are characteristically found in the chloroplast of

(a)  Fungi                                  (b)  Algae (c)   Pteridophytes                   (d)  Angiosperms Ans. b (44)

Floridean starch is found in

(a)  Chlorophyceae                  (b)  Rhodophyceae (c)   Myxophyceae                    (d)  Cyanophages Ans. b (5)

A filament of an alga can be differentiated from that of a fungus by

(a)  Cells are uninucleate in algae whereas they are multinucleate in fungi (b)  Chlorophyll present in algae and absent in...

Pyrenoids are the centre of formation of

(a)  Enzymes                            (b)  Proteins (c)   Fats                                    (d)  Starch Ans. d (7)

73. A fixed volume of iron is drawn into a wire of length L. The extension x produced in this wire by a constant force F is proportional to

(a) 1/L2                                     ...

Sporophytic generation is represented by zygote only in

(a)  Funaria                               (b)  Chlamydomonas (c)   Pinus                                  (d)  Selaginella Ans. b (10)

75. To keep constant time, watches are fitted with balance wheel made of

(a)  Invar                                                (b)   Stainless steel (c)   Tungsten                           ...

Rhodophyceae is red coloured due to

(a)  Xanthophyll (b)  Carotenoids (c)   g–phycoerythrin (d)  g–phycocyanin Ans.c (8)

Four particles each of mass M, are located at the vertices of a square with side L. The gravitational potential due to this at the centre of the square is

Answer: a (30)

Algae are in the same major group of plants as are the

(a)  Mosses                               (b)  Liverworts (c)   Fungi                                  (d)  Ferns Ans. c (13)

Alga rich in protein is

(a)  Chlorella                            (b)  Spirogyra (c)   Oscillatoria                         (d)  Ulothrix Ans. a (21)

There are two planets. The ratio of radius of the two planets is K but ratio of acceleration due to gravity of both planets is g. What will be the ratio of their escape velocity

(a)     ( Kg )1/2                           (b) ( Kg...

Red eye spot containing haematochrome is meant for

(a)  Photosynthesis                 (b)  Respiration (c)   Photoreception                 (d)  Movements Ans. c (9)

Pyrenoids are made up of

(a)  Core of starch surrounded by sheath of protein (b)  Core of protein surrounded by fatty sheath (c)   Proteinaceous centre...

Algae are important, we should study algae because

(a)  They are good organisms to experiment with (b)  They can be grown in large tank cultures (c)   They may...
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