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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

Correct Answer :

B. 21


Number of chromosome in root cells of wheat plant is 2n = 42 so n = 21 The number of chromosome in the cell of pollen grain is 21 because pollen grains are haploid (n) in nature.

Related Questions

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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

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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

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

Statement 1: Double fertilization is a characteristic feature of angiosperms.
Statement 2: Double fertilization involves two fusions.

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(s) is/are correct ?

A. In angiosperms, each embryo sac has a three-celled egg apparatus one egg cell and two synergids, three antipodal cells and two polar nuclei.

B. All seed bearing plants i.e., gymnosperms and angiosperms follow dipontic life patterns of plants.

C. In gymosperms, roots in some genera have fungal association in the form of mycorrhiza (Pinus) while in some others (Cycas) small specialized roots called coralloid are associated with N2 fixing cyanobacteria.

D. All of the above

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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

Phylogenetic classification system is based on the

A. morphological characters of various organisms.

B. anatomical characters of various organisms.

C. physiological characters of various organisms.

D. evolutionary relationships between the various organisms.

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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

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

Match column-I with column-II and choose the correct option.
Column-IColumn-II
A. Amphibian of theI. Sphagnum plant kingdom
B. Specialized structuresII. Angiosperms in liverworts for asexual reproduction
C. Monocotyledons andIII. Bryophytes dicotyledons
D. A plant which hasIV. Gemmae capacity to holding water

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

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

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

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

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4

Classification of plants proposed by Carolus Linnaeus was artificial because it was based on

A. only a few morphological characters.

B. evolutionary tendencies which are diverse.

C. anatomical characters which are adaptive in nature.

D. physiological traits alongwith morphological characters.

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4

Match column-I with column-II and choose the correct option.
Column-IColumn-II
A. PhaeophyceaeI. Have an elaborate mechanism of spore dispersal
B. RhodophyceaeII. first terrestrial plant with vascular tissue-phloem and xylem
C. MossesIII. Asexual reproduction by biflagellate zoosposes
D. PteridophytesIV. Polysiphonia, Porphyra, Gracilaria

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

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

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

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

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4

You are given an unknown plant to study in the laboratory. You find that it has chlorophyll, no xylem. Its multicellullar sex organs are enclosed in a layer of jacket cells. Its gametophyte stage is free living. The plant probabily belongs to

A. chlorophyceae

B. bryophyte

C. pteridophyte

D. gymnosperm

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4

Fruits are not formed in gymnosperms because of

A. absence of pollination.

B. absence of seed.

C. absence of fertilization.

D. absence of ovary.

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4

A student was given a sample to observe under the microscope. He observed and found that the sample is the most common type of spore involved in asexual reproduction in algae. Identify the spore.

A. Zoospore

B. Endospore

C. Hypnospore

D. None of the above

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4

Match column-I with column-II and choose the correct option.
Column-IColumn-II
A. AgarI. Single cell protein, used as food supplements by space travellers
B. AlginII. Red algae
C. CarrageenIII. Brown algae
D. ChlorellaIV. Gelidium, Gracilaria Spirullina

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

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

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

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

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4

Cytological information like chromosome number, structure, behaviour are related with

A. numerical taxonomy

B. cytotaxonomy

C. chemotaxonomy

D. all of the above

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4

What is the number and position of insertions of flagella in rhodopyceae class of algae ?

A. 2 - 8, equal, apical

B. 2, unequal, lateral

C. 2 - 6, equal, lateral

D. Absent

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4

Match the column I with column II and choose the option which shows its correct combination.
Column-IColumn-II
(Pattern of life cycle in plant)(Examples)
A. HaplonticI. Bryophytes, Pteridophytes, life cycle Ectocarpus, Polysiphonia, Kelps
B. DiplonticII. Seed bearing plants life cycle (Gymnosperm and Angiosperm), Fucus
C. Haplo-diplonticIII. Many algae (Volvox, life cycle Spirogyra) and some species of Chlamydomonas

A. A III; B II; C I

B. A I; B II; C III

C. A II; B I; C III

D. A III; B I; C II

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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

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

If you are asked to classify the various algae into distinct groups then which of the following characters you should choose for the classification ?

A. Nature of habitat

B. Structural organization of thallus

C. Chemical composition of the cell wall

D. Types of pigments present in the cell.

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4

Which of the following pteridophytes belong to class pteropsida?

A. Equisetum and Psilotum

B. Lycopodium and Adiantum

C. Selaginella and Pteris

D. Pteris and Adiantum

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4

What is common in all the three, Funaria, Dryopteris and Ginkgo?

A. Independent sporophyte

B. Presence of archegonia

C. Well developed vascular tissues

D. Independent gametophyte

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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

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.

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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 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

In order to colonize land, plants needed to acquire which of the following characteristics?

A. A mechanism for moving water throughout the plant.

B. A mechanism to prevent desiccation of tissues.

C. An ability to screen ultraviolet radiation.

D. Both (b) and (c)

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4

The unique feature of bryophytes compared to other plant groups is that

A. they produce spores.

B. they lack vascular tissues.

C. they lack roots.

D. their sporophyte is attached to the gametophyte.