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4

Which of the following statement(s) is/are correct about gemmae ?
(i) These are specialised structures by which asexual reproduction take place in liverworts.
(ii) They are green, multicellular and asexual buds.
(iii) They develop in small receptacles called gemma cups.
(iv) They detach from parent body and germinate to form new individuals.

A. (i) and (ii)

B. (ii) and (iii)

C. (i), (ii) and (iii)

D. All of these

Correct Answer :

D. All of these


Gemmae are a means of asexual reproduction found in many bryophytes (e.g, liverworts). They are 1 to many celled, specially produced clonal plant fragments. They are green, multicellular, asexual buds which develop in small receptacles (called gemma cups) located on the thalli. Gemmae become detached from the parent body and germinate to form new individuals.

Related Questions

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4

Which of the following statements about algae is/are correct?
(i) Algae are chlorophyll bearing simple, thalloid, heterotrophic and aquatic (both fresh water and marine) organisms.
(ii) Algae reproduce by vegetative means only.
(iii) Fusion of two gametes dissimilar in size is termed as oogamous.
(iv) A few of the massive forms of algae such as kelps, form massive plant bodies.

A. Only (i)

B. Both (i) and (iii)

C. Only (iv)

D. All of these

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4

Which of the following group of plant is being described by the given statements ?
(i) They are plants in which the ovules are not enclosed by any ovary wall and remain exposed before and after fertilization.
(ii) The giant red wood tree Sequoia is one of the tallest tree species of the group.
(iii) The roots are generally tap roots.
(iv) They are heterosporous and they produce haploid microspores and megaspores.

A. Algae

B. Bryophytes

C. Gymnosperms

D. Pteridophytes

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4

Cycas and Adiantum resemble each other in having

A. seeds

B. motile sperms

C. cambium

D. vessels

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4

Angiosperms have dominated the land flora primarily because of their

A. power of adaptability in diverse habitat.

B. property of producing large number of seeds.

C. nature of self pollination.

D. domestication of man.

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4

Which of the following statement(s) is/are correct?
(i) Green algae are the members of chlorophyceae.
(ii) Brown algae are found primarily in marine habitates
(iii) Some red algae are found in fresh water, mostly occur in salt water, some are in brackish water.
(iv) The food in red algae is stosed as floridean starch.
(v) Red alga may occur in both well-lighted regions close to water-surface and also at great depths in oceans where light penetration is little.

A. (i) and (v) only

B. (ii), (iii) and (iv) only

C. All of the above

D. None of the above

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4

Protonema and leafy stage are the predominant stage of the life cycle of

A. moss

B. dicots

C. liverwort

D. gymnosperm

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4

If the cells of root in wheat plant have 42 chromosomes, then the no. of chromosome in the cell of pollen grain is

A. 14

B. 21

C. 28

D. 42

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4

In class phaeophyceae, the plant body is usually attached to the substratum by a A and has a stalk, the B and leaf like photosynthetic organ-the C .

A. A holdfast, B stipe, C frond

B. A stipe, B holdfast, C frond

C. A frond, B stipe, C holdfast

D. A stipe, B frond, C holdfast

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4

Which of the following statements (i) - (v) are correct ?
(i) In Equisetum, the female gametophyte is retained on the parent sporophyte.
(ii) In Ginkgo, male gametophyte is not independent.
(iii) The sporophyte in Riccia is more developed than that in Polytrichum.
(iv) Sexual reproduction in Volvox is isogamous.

A. Two

B. Three

C. Four

D. One

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4

Match the classes of pteridophytes given in column I with their examples given in column II and choose the correct option
Column -IColumn-II
(Classes of pteridophytes)(Examples)
A. PsilopsidaI. Selaginella
B. LycopsidaII. Psilotum
C. SphenopsidaIII. Dryopteris
D. PteropsidaIV. Equisetum

A. A II; B I; C IV; D III

B. A I; B II; C IV; D III

C. A II; B I; C III; D IV

D. A II; B IV; C I; D III

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4

Refer the statement and answer the question. They usually reproduce vegetatively by fragmentation and asexually by non - motile spores and sexually by non - motile gametes.
Identify the group of plants and its example.

A. Mosses, Funaria

B. Red algae, Polysiphonia

C. Brown algae, Laminaria

D. Pteridophytes, Selaginella

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4

Which one of the following is a correct statement?

A. Pteridophyte gametophyte has a protonemal and leafy stage.

B. In gymnosperms, female gametophyte is free-living.

C. Antheridiophores and archegoniophores are present in pteridophytes.

D. Origin of seed habit can be traced in pteridophytes.

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4

Deep in the tropical rain forest, a botanist discovered an unusual plant with vascular tissues, stomata, a cuticle, flagellated sperm, conelike reproductive structures bearing seeds, and an alternation-of-generations life cycle. He was very excited about this discovery because it would be rather unusual for a plant to have both

A. a cuticle and flagellated sperm.

B. vascular tissues and alternation of generations.

C. seeds and flagellated sperm.

D. alternation of generations and seeds.

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4

Which of the following class of algae is mostly found in salt water ?

A. Phaeophyceae

B. Rhodophyceae

C. Chlorophyceae

D. Both (a) and (b)

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4

Mosses are of great ecological importance because of

A. its contribution to prevent soil erosion.

B. its contribution in ecological succession.

C. its capability to remove CO from the atmosphere.

D. both (a) and (b)

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4

Which of the following groups of plants play an important role in plant succession on bare rocks/soil ?

A. Algae

B. Bryophytes

C. Pteridophytes

D. Gymnosperms

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4

Moss peat is used as a packing material for sending flowers and live plants to distant places because

A. it reduces transpiration.

B. it serves as a disinfectant.

C. it is easily available.

D. it is hygroscopic.

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4

Match the column-I with column-II and choose the correct option.
Column-IColumn-II
(System of classification)(Characteristics)
A. Artificial systemI. Based on few morphological of classification characters
B. Natural systemII. Based on evolutionary of classification relationships between the various organisms
C. PhylogeneticIII. Based on natural affinities system of among the organisms and classification consider external as well as internal features.

A. A II; B I; C III

B. A I; B III; C II

C. A III; B II; C I

D. A I; B II; C III

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4

Pyrenoids in green algal cells are related to

A. starch formation

B. protein storage

C. general metabolism

D. enzyme secretion

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4

Algin, carrageen and proteins are obtained from

A. red algae, brown algae, green algae respectively.

B. brown algae, red algae, green algae respectively.

C. red algae, green algae, brown algae respectively.

D. green algae, brown algae, red algae respectively.

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4

Which of the following branch of science is being described by the given statements ?
(i) It can easily done by using computers based on all observable characters.
(ii) Numbers and codes are assigned to all the characters and the data are then processed.
(iii) Each character is given equal weightage and at the same time hundred of characters can be considered.

A. Cytotaxonomy

B. Numerical taxonomy

C. Chemotaxonomy

D. ??-taxonomy

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4

Which of the following, examples belongs to the same class of algae?

A. Chara, Fucus, Polysiphonia

B. Volvox, Spirogyra, Chlamydomonas

C. Porphyra, Ectocarpus, Ulothrix

D. Sargassum, Laminaria, Gracilaria

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4

Which of the following pair is incorrectly matched ?

A. Chlorophyceae Major pigments are chl a and b.

B. Phaeophyceae Cell wall is made up of cellulose and algin.

C. Rhodophyceae Stored food is mannitol.

D. Chlorophyceae Cell wall is made up of cellulose.

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4

Which one of the following statement concerning the algae is incorrect ?

A. Most algae are photosynthetic.

B. Algae can be classified according to their pigments.

C. All algae are filamentous.

D. Spirogyra does not produce zoospores.

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4

In angiosperms, a mature male gametophyte is derived from a pollen mother cell by

A. three mitotic divisions.

B. one meiotic and two mitotic divisions.

C. two meiotic divisions.

D. a single meiotic division.

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4

Chemotaxonomy is connected with

A. classification of chemicals found in plants.

B. use of phytochemical data in systematic botany.

C. application of chemicals on herbarium sheets.

D. use of statistical methods in chemical yielding plants.

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4

Which of the following group of plant is being described by given statements ?
(i) The plant body is thalloid.
(ii) Asexual reproduction takes place by fragmentation of thalli, or by the formation of specialized structures called gemmae.
(iii) The sporophyte is differentiated into a foot, seta and capsule.
(iv) They grow usually in moist and shady habitats.

A. Liverworts

B. Moss

C. Fern

D. Gymnosperm

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4

A bryophyte differs from pteridophytes in having

A. archegonia.

B. lack of vascular tissue.

C. swimming antherozoids.

D. independent gametophytes.

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4

Statement 1: Members of phaeophyceae vary in colour from olive green to various shades of brown.
Statement 2: Phaeophyceae possess chlorophyll a, c, carotenoids and xanthophylls.

A. Both statements -1 and statement - 2 are true and statement - 2 is the correct explanation of statement - 1.

B. Both statements -1 and statement - 2 are true but statement - 2 is not the correct explanation of statement - 1.

C. Statement -1 is true and statement - 2 is false.

D. Statement -1 is false and statement - 2 is true.

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4

Which of the following statement is incorrect ?

A. Double fertilization is unique to gymnosperms and monocotyledons.

B. Sequoia, a gymnosperm, is one of the tallest tree species.

C. Phaeophyceae members possess chlorophyll a, c, carotenoids and xanthophylls.

D. Moss is a gametophyte which consists of two stages namely, protonemal stage and leafy stage.