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May 2022

Home2022MayPage 13

‘Male shield fern’ is

(a)  Dryopteris                         (b)  Pteris (c)   Adiantum                           (d)  None of these Ans. a (7)

What is not true for Dryopteris

(a) Mature archegonia secretes maleic acid (b)  Antherozoids are sickle shaped and multi flagellate (c)   Archegonia has one binucleate neck...

123. There is no change in the volume of a wire due to change in its length on stretching. The Poisson’s ratio of the material of the wire is

(a)   + 0.50                                     (b)   – 0.50 (c)   0.25                                         (d)   – 0.25 Answer-b (11)

Distinct alternation of generation is found in

(a)  Rhizopus                             (b)  Bacteria (c)   Viruses                               (d)  Pteris (Fern) Ans. d   (7)

The site of spore formation in Dryopteris is

(a)  Sorus                                  (b)  Sporophyll (c)   Sporophore                       (d)  Sporangium Ans. d (12)

Kidney- shaped covering of Dryopteris is

(a)  Ramentum                        (b)  Placenta (c)   Indusium                           (d)  Sporophyll Ans. c (7)

Brown hair found at the base of Pteris leaves are

(a)  Modified stipules              (b)  Modified leaflets (c)   Ramenta                            (d)  Spines Ans. c (9)

Neck canal cells in Dryopteris are

(a)  One with two nuclei         (b)  Two (c)   One with one nucleus      (d)  Four Ans. a (7)

121. The value of Poisson’s ratio lies between

(a) –1 to   1/2                                 ...

Presence of ciliated antherozoids in Dryopteris indicates

(a)  Terrestrial habit               (b)  Aquatic ancestry (c)   Both (a) and (b)               (d)  None of these Ans. b (9)

Which one controls dehiscence of sporangium in Dryopteris

(a)  Annulus                             (b)  Tapetum (c)   Sorus                                  (d)  Indusium Ans. a (8)

120. A rubber cord 10 m long is suspended vertically. How much does it stretch under its own weight (Density of rubber is 1500

A rubber cord 10 m long is suspended vertically. How much does it stretch under its own weight (Density of...

In Dryopteris, the antherozoids are

(a)  Biflagellate sickle-shaped (b)  Multiflagellate sickle shaped (c)   Multiflagellate spirally coiled (d)  Biflagellate spirally coiled Ans. c (11)

In Pteridophytes/ Dryopteris meiosis occurs at the time of

(a)  Gamete formation            (b)  Spore formation (c)   Formation of prothallus  (d)  Formation of sex organs Ans. b (9)

119. A substance breaks down by a stress of

A substance breaks down by a stress of 106 N/m2. If the density of the material of the wire is...

In Dryopteris, the sori are borne

(a)  Laterally                            (b)  Abaxially (c)   Adaxially                           (d)  Marginally Ans. b (7)

Placenta in Dryopteris is the place of attachment of

(a)  Ovules                                (b)  Ramenta (c)   Sporangia                          (d)  Archegonia Ans. c (8)

Pteridium possess

(a)  Polycyclic dictyostele (b)  Actinostele (c)   Siphonostele (d)  Amphiphloic siphonostele Ans. a (6)

118. A wire of cross section

A wire of cross section 4 mm2 is stretched by 0.1 mm by a certain weight. How far (length) will...

Two distinct generations in a single life history are common in

(a)  Bacillus                               (b)  Mango (c)   Pteris (Dryopteris)           (d)  Spirogyra Ans. c (10)

Which of the following is not heterosporous

(a)  Dryopteris                         (b)  Selaginella (c)   Marsilea                             (d)  Pinus Ans. a (8)

Multiflagellate male gametes (sperms) are found in

(a)  Chlamydomonas                (b)  Funaria (c)   Dryopteris                         (d)  Riccia Ans. c (5)

117. A wire of length 2 m is made from  10

A wire of length 2 m is made from  10 cm3 of copper. A force F is applied so that...

113. In the Young’s experiment, If length of wire and radius both are doubled then the value of  Y will become

In the Young’s experiment, If length of wire and radius both are doubled then the value of  Y will become...

Characteristic of fern is

(a)  Circinate vernation (b)  Reticulate venation (c)   Parallel venation (d)  None of these Ans. a (9)

The first plants to appear after a forest fire are the ferns, this is because of the survival of their

(a)  Spores                                (b)  Leaves (c)   Fronds                               (d)  Rhizomes (e)  Both (c) and (d) Ans. d (9)

First vascular plant is

(a)  Thallophyta                       (b)  Bryophyta (c)   Pteridophyta                     (d)  Spermatophyta Ans. c (10)

In pteridophytes, phloem is without

(a)  Sieve cells                          (b)  Sieve tubes (c)   Companion cells                (d)  Both (b) and (c) Ans. c   (9)

Ectophloic siphonostele is found in

(a)  Adiantum and Cucurbitaceae (b)  Osmunda and Equisetum (c)   Marsilea and Botrychium (d)  Dicksoni and Maidenhair fern Ans. b (5)

Monoecious condition is found in

(a)  Cycas                                  (b)  Selaginella (c)   Pinus                                  (d)  Pteridium Ans. d (8)

116. Young’s modulus of perfectly rigid body material is

(a)   Zero                                        (b)   Infinity (c)  1×1010 N/m2                        (d) ...

115. A wire of diameter 1mm breaks under a tension of 1000 N. Another wire, of same material as that of the first one, but of diameter 2 mm breaks under a tension of

(a)   500 N                                      (b)   1000 N (c)   10000 N                                 (d)   4000 N Answer-d (12)

114. Minimum and maximum values of Poisson’s ratio for a metal lies between

(a)   -∞ to +∞                            (b)   0 to 1 (c)  -∞ to 1                                 (d)   0 to 0.5 Answer-d (12)

A fern prothallus is bisexual. If fertilization takes place between their gametes then it is known as

(a)  Cros fertilization               (b)  Self fertilization (c)   Isogamous                         (d)  Viviparous Ans. b (9)

Which is the most important group on earth

(a)  Mosses                               (b)  Tracheophyta (c)   Bryophyta                         (d)  Liverworts Ans. b (9)

During fertilization in ferns, male gamete reaches the female gamete through the agency of

(a)  Water                                 (b)  Insects (c)   Chemicals                          (d)  Winds Ans. a (10)

To which of the groups would you assign plant which has a vascular supply, lacks ovules and reproduces by means of spores

(a)  Gymnosperms                   (b)  Thallophyta (c)   Bryophyta                         (d)  Pteridophyta Ans. d (7)

Female gametophyte in heterosporous ferns is

(a)  Archegonium                    (b)  Protonema (c)   Prothallus                          (d)  Megasporangium Ans. c     (8)

Disposal of spores in fern takes place through

(a)  Annulus                             (b)  Stomium (c)   Both (a) and (b)               (d)  Indusium Ans. c (7)

Protonema stage is found in

(a)  Ferns                                  (b)  Mosses (c)   Liverworts                         (d)  Fungi Ans. a (11)
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