Plant Kingdom Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about algae is incorrect?

Algae perform about half of the total carbon dioxide fixation on Earth.
Sexual reproduction in algae can be isogamous, anisogamous, or oogamous.
All algae produce hydrocolloids like algin and carrageen.
Agar is obtained from algae like Gelidium and Gracilaria.
3

Only certain marine brown and red algae produce hydrocolloids like algin and carrageen, not all algae.

Which of the following statements about gymnosperms is correct?

Gymnosperms have ovules enclosed within an ovary wall.
The megaspore mother cell in gymnosperms undergoes meiosis to form four megaspores.
Gymnosperms produce flowers for reproduction.
The female gametophyte in gymnosperms is free-living.
2

The megaspore mother cell in gymnosperms divides meiotically to form four megaspores, one of which develops further.

Which of the following statements about Phaeophyceae is incorrect?

Phaeophyceae vary from simple filamentous forms to large kelps.
Their zoospores are pear-shaped with two unequal lateral flagella.
Phaeophyceae produce algin, a commercially used hydrocolloid.
Phaeophyceae are found only in freshwater habitats.
4

Phaeophyceae are primarily marine, with rare freshwater forms, not restricted to freshwater habitats.

Which pigment gives brown algae their characteristic color?

Chlorophyll a
Chlorophyll b
Fucoxanthin
Phycoerythrin
3

Fucoxanthin, a xanthophyll pigment, gives brown algae (Phaeophyceae) their characteristic color.

Which algae is used as a source of agar, a solidifying agent for microbial cultures?

Ulothrix
Gelidium
Chara
Ectocarpus
2

Gelidium, a red alga (Rhodophyceae), is a major source of agar used in microbial culture media.

Which of the following statements about Chlorophyceae is correct?

Chlorophyceae have chlorophyll c as their dominant pigment.
Their chloroplasts can be cup-shaped or reticulate.
Chlorophyceae store food as laminarin.
All Chlorophyceae are multicellular and marine.
2

Chlorophyceae chloroplasts vary in shape, including discoid, plate-like, reticulate, and cup-shaped.

Which type of sex organs are present in bryophytes?

Unicellular
Multicellular
Vesicular
Nuclear
2

In bryophytes, the sex organs (antheridium and archegonium) are multicellular.

Which of the following statements about algae is incorrect?

Algae vary in size from microscopic forms to massive kelps.
Some algae live in association with animals, like on sloth bears.
All algae store food as starch in pyrenoids.
Algae are classified into three classes based on pigments and stored food.
3

Not all algae store food as starch in pyrenoids; e.g., Phaeophyceae store laminarin and mannitol, and Rhodophyceae store floridean starch.

Which of the following statements about Rhodophyceae is correct?

Rhodophyceae have flagellated gametes.
They store food as floridean starch.
Rhodophyceae are primarily freshwater green algae.
Their dominant pigment is fucoxanthin.
2

Rhodophyceae, or red algae, store food as floridean starch, similar to amylopectin and glycogen.

Which of the following algae is colonial?

Chara
Spirogyra
Volvox
Ulothrix
3

Volvox is a colonial green alga that forms spherical colonies composed of many individual cells.

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