The pyrenoids are made up of                                        [1995]

(a) Proteinaceous centre and starchy sheath

(b) Core of protein surrounded by fatty sheath

(c) Core of starch surrounded by sheath of protein

(d) Core of nucleic acid surrounded by protein sheath 

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Consider the following features:

I. Chlorophyll a and Chlorophyll c

II. Fucoxanthin

III. Floridean starch

IV. Flagella 2 in number, unequal and lateral

Which of these are seen in Phaeophyceae?

(1) I, II, III

(2) I, II, IV

(3) II, III, IV

(4) I, II, III, IV

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The endosperm of a gymnosperm develops _______ fertilization, whereas the endosperm of an angiosperm develops _________ fertilization.

(1) before, before

(2) after, after

(3) after, before

(4) before, after

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In Pinus,

I. The stem is branched

II. Roots have fungal association in the form of mycorrhiza

III. The male and female strobili are borne on different trees

Of the above statements:

(1) Only I is correct

(2) Only II is correct

(3) Only I and II are correct

(4) I, II and III are correct

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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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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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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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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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