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May 2022

Home2022MayPage 11

Fruits are not found in gymnosperms plants because

(a)  They are seedless plants (b)  They are not pollinated (c)   They have no ovary (d)  Process of fertilization does...

In gymnosperms pollination is exclusively by

(a)  Animals                             (b)  Wind (c)   Water                                 (d)  Insects Ans. b (9)

A mass M is split into two parts, m and (M–m), which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts

(a)  1/3                                     (b)  1/2 (c)   1/4                                     (d)  1/5 Answer: b (7)

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of earth

(a)      The acceleration of S is always directed towards the centre of the earth (b)  The angular momentum of S...

Gymnosperms do not have

(a)  Trees                                  (b)  Shrubs (c)   Lianas                                (d)  Herbs Ans.d (7)

Most of the gymnosperms have

(a)  Only antheridia (b)  Both antheridia and archegonia (c)   Archegonia but no antheridia (d)  Both absent Ans. c (8)

In which of the following groups would you place a plant which produces seeds but lacks flower and fruits

(a)  Fungi                                  (b)  Bryophytes (c)   Pteridophytes                   (d)  Gymnosperms Ans. d (6)

During adverse season, therophytes survive by

(a)  Bulbs                                  (b)  Corms (c)   Rhizomes                           (d)  Seeds Ans. d (8)

Which one of the following is not a cryptogam

(a)  Algae                                  (b)  Bryophyta (c)   Pteridophyta                     (d)  Gymnosperms Ans. d (10)

Three generations one within the other are present in the seeds of

(a)  Gymnosperms                   (b)  Dicots (c)   Monocots                           (d)  All the above Ans. a (10)

Primary development of male and female gametophytes takes place in the sporangia itself in

(a)  Selaginella                         (b)  Fern (c)   Pinus                                  (d)  Both (a) and (c) Ans. d (29)

Most gymnosperms are

(a)  Xerophytic                         (b)  Hydrophytic (c)   Halophytic                         (d)  Epiphytic Ans. a (7)

Selaginella possesses and outgrowth proximally

(a)  Ligule                                 (b)  Indusium (c)   Stipule                               (d)  Petiole Ans. a   (9)

Which of the following does not belong to Selaginella

(a)  Ramenta                            (b)  Trabeculae (c)   Rhizophore                        (d)  Ligule Ans. a (20)

Polystelic stem is seen in

(a)  Cycas                                  (b)  Riccia (c)   Selaginella                         (d)  Funaria Ans. c (8)

The antherozoid of Selaginella has

(a)  Elongated body with two flagella at one end (b)  Elongated body with many flagella at one end (c)   Top...

In Selaginella when sporophyte develops directly from female gametophyte other than oosphere, the condition is called

(a)  Apospory                           (b)  Aplanospory (c)   Apogamy                           (d)  Cleistogamy Ans. c (6)

Heterospory and seed habit are exhibited by a plant possessing

(a)  Petiole                                (b)  Ligule (c)   Bract                                  (d)  Spathe Ans. b (13)

Physiological heterospory is seen in

(a)  Chlamydomonas                (b)  Rhizopus (c)  Selaginella                          (d)...

Spores with chloroplast is present in

(a)  Selaginella                         (b)  Equisetum (c)   Puccinia                              (d)  Rhizopus Ans. a (42)

Which of the following is known as ‘resurrection plant’

(a)  Selaginella                         (b)  Welwitschia (c)   Refflesia                             (d)  Chlorella Ans. a (9)

In Selaginella, reduction division occurs during the formation of

(a)  Sperms                              (b)  Microspores only (c)   Megaspores only               (d)  Both (b) and (c) Ans. d (29)

Rhizophore in Selaginella is

(a)  A modified leaf                 (b)  A root (c)   A shoot                               (d)  Organ sui genesis Ans. d (7)

Heteromorphic alternation of generations is found in

(a)  Spirogyra                           (b)  Mucor (c)   Selaginella                         (d)  Pinus Ans. c (15)

The main plant body of Selaginella sp. is

(a)  Gametophyte (b)  Sporophyte (c)   Both gametophyte and sporophyte (d)  Halophyte Ans. b (6)

Heterosporous condition and ligulate leaves are found in

(a)  Funaria                               (b)  Selaginella (c)   All pteridophytes             (d)  All bryophytes Ans. b (8)

The basis of seed habit in Selaginella is

(a)  Heterospory (b)  Reduction in the number of megaspores (c)   Retention of a megaspores in the cone (d)  All the...

In Selaginella tapetum originates from

(a)  Wall of sporangium          (b)  Sporogenous tissue (c)   Sporophyll                         (d)  Basal part of cone Ans. b (10)

Number of megaspore in Selaginella rupestris is

(a)  One                                    (b)  Two (c)   Three                                 (d)  Four Ans. b (9)

Selaginella is heterosporous. It produces two types of spores. The microspore develops into microgametophyte and the megaspore develops into megagametophyte. With respect to gametophyte, which one statement is correct

(a)  The microgametophyte is devoid of chloro~phyll at maturity (b)  The megagametophyte possesses chlorophyll at maturity (c)   The megagametophyte develops...

Development of embryo in Selaginella is

(a)  Meroblastic                       (b)  Holoblastic (c)   Aposporous                       (d)  None of the above Ans. a (9)

Rhizophore in Selaginella is

(a)  Exogenous in origin (b)  Endogenous in origin (c)   Internal in origin (d)  None of the above Ans. a (11)

Microsporangia and megasporangia are found in same strobilus in

(a)  Fern                                   (b)  Selaginella (c)   Pinus                                  (d)  Moss Ans. b (15)

One character common for Selaginella and fern is

(a)  Heterospory (b)  Protostele (c)   Development of sporangium (d)  Absence of ovule Ans. d   (7)

Positively geotropic structure rhizophore of Selaginella is

(a)  Root (b)  Stem (c)   A new organ called sui generis (d)  None of the above Ans. c (9)

Selaginella is characterized by the presence of

(a)  Homospory                        (b)  Ligule (c)   Flowers                              (d)  None of the above Ans. b (10)

Rhizophore of Selaginella has

(a)  Diarch stele                       (b)  Triarch stele (c)   Monoarch stele                 (d)  Tetrarch stele Ans. c (5)

Adaxial outgrowth from the base of leaves in Selaginella is called

(a)  Stipule                               (b)  Ligule (c)   Trabaculae                        (d)  Velum Ans. b (11)

The stem of Selaginella is anatomically characterised by the presence of

(a)  Siphonostele (b)  Amphiphloic siphonostele (c)   Protostele (d)  Ectophloic siphonostele Ans. c (10)

The number of male prothellial cells in Selaginella are

(a)  One                                    (b)  Two (c)   Four                                   (d)  Nil Ans. a (9)
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