Identify the incorrect statement:

(1) The earliest systems of classification used only gross superficial morphological characters.

(2) Linnaeus classification of plants was a natural classification as it was based on the androecium structure.

(3) Artificial systems gave equal weightage to vegetative and sexual characteristics.

(4) Natural classification systems are based on natural affinities among the organisms

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Identify the incorrecty statement:

(1) Numerical Taxonomy is based on all observable characteristics.

(2) More weightage is given to reproductive characters and all other characters are given equal importance in numerical taxonomy.

(3) Cytotaxonomy is based on cytological information like chromosome number, structure, behaviour

(4) Chemotaxonomy uses the chemical constituents of the plant

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Match each term with its definition and choose your answer from the codes given:

I.

Isogamy

1.

The union of two gametes

II.

Syngamy

2.

Two gametes, one larger than the other

III. 

Heterogamy  

3.  

Two kinds of gametes, one motile and other non motile

IV.

Anisogamy

4.

Two kinds of morphologically distinct gametes

V.

Oogamy

5.

Both gametes morphologically indistinguishable

Codes:

 

I  

II

III

IV

V

(1)   

1     

2     

3     

4     

5

(2)

4

1

2

3

4

(3)

5

1

2

4

3

(4)  

3

1

2

4

5

 

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Difficulty Level:


Identify the incorrectly matched pair:

(1)  

Chlamydomanas:  

Microscopic unicellular algae

(2)

Volvox:

Colonial algae

(3)

Ulothrix:

Filamentous algae

(4)

Fucus:

Isogamous algae

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Difficulty Level:


Identify the incorrect statement regarding algae:

(1) At least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis.

(2) Around 70 species of freshwater algae can be used as food.

(3) Certain marine brown and red agae produce large amounts of hydrocolloids (water holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially.

(4) Agar, obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies.

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What is not true for red algae?

(1) Lack centriole and flagella

(2) Accessory pigments include phycocyanin, phycoeythrin and allophycocyanin

(3) They reproduce using alternation of generation

(4) The stored food is floridean starch very similar to cellulose

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Identify the incorrect statement reagrding green algae?

(1) They contain chl a, chl b as well as carotenoids.

(2) The chloroplasts may be discoid, plate-like, reticulate, cup-shaped, spiral or ribbon-shaped in different species.

(3) Most members have one or more storage bodies called pyrenoids located outside the chloroplasts.

(4) They usually have a rigid cell wall made of an inner layer of cellulose and an outer layer of pectose.

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Consider the following statements regarding brown algae:

I. The pigments are chl a, c and xanthophylls, fucoxanthin

II. Storage food is laminarin and mannitol 

III. The cellulosic cell wall is covered with algin

IV. They have a centrally located vacuole

V. Their photosynthetic organs are called as fronds - leaf like structures

VI. They have pear shaped biflagellate zoospores

VII. They have two unequal laterally attached flagella.

The number of correct statements is

(1) 5

(2) 6

(3) 7

(4) 4

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Consider the following adaptations seen in plants:

I. Lack of cuticle

II. Presence of stomata for exchange of gases

III. Evolution of leaf

IV. Dominance of sporophyte

V. Structural support of vascular tissue

Which of the above adaptations would be required in a plant if it has to be successfully adapted to life on land?

(1) All but I

(2) All but I and III

(3) I, II, III and IV

(4) All

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Identify the incorrect statement regarding mosses:

(1) Leaves are one cell thick except at the midrib and lack stomata

(2) The first gametophyte stage is protonema that is creeping and green

(3) The second stage is the leafy stage, which develops from the secondary protonema as a lateral bud.

(4) Rhizoids are elongated and unicellular

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Difficulty Level: