Plant Kingdom - Online Test
Q1. In Phaeophyceae, the food stored in the form of
Answer : Option D
Explaination / Solution:
In Phaeophyceae, food is stored as complex carbohydrates which may be in the form of laminarin or mannitol.
Q2. Kelps are
Answer : Option D
Explaination / Solution:
Kelps are marine algae of class phaeophyceae or brown algae. The body of kelp may reach upto 100 meter long. They vary in colour from olive green to various shades of brown depending upon xanthophyll pigments , fucoxanthin present in them.
Q3. An algae having ribbon shaped chloroplast is
Answer : Option C
Explaination / Solution:
The shape of a chloroplast varies from species to species. It may be cup-shaped (e.g., Chlamydomonas), (e.g., Vaucheria), Girdle (e.g., Ulothrix), Stellate or Star-shaped (e.g., Zygnema), Reticulate or net-like (e.g., Cladophora, Oedogonium), Spiral or ribbon or scalariform (e.g., Spirogyra), ovoid or disc or spheroid in higher plants
Q4. Laminaria and Fucus belong to
Answer : Option B
Explaination / Solution:
The common forms of Brown algae or Phaeophyceae are Ectocarpus, Dictyota, Laminaria, Sargassum and Fucus.2
Q5. Angiosperm: roots :: Phaeophyceae:
Answer : Option B
Explaination / Solution:
The plant body of phaeophyceae is usually attached to the substratum by a holdfast whereas the angiosperms attach to the substratum with the help of roots.
Q6. The half of the total carbon dioxide fixation on earth is carried out by algae through
Answer : Option C
Explaination / Solution:
Being photosynthetic, algae increase the level of dissolved oxygen in their immediate environment.
Q7. In Ulothrix or Spirogyra, reduction division (meiosis) occurs at the time of
Answer : Option A
Explaination / Solution:
In Ulothrix/Spirogyra reduction division (meiosis) occurs at the time of zygospore germination. Plant body of Ulothrix and Spirogyra, is gametophytic (haploid), they produce zoogametes (n) which fuses to form zygosporic (2n) diploid, which is a resting spore. Onset of favourable condition zygospore undergoes reductional division, or meiosis to produce zoo- meiospores.
Q8. The cell wall of green algae is made up of
Answer : Option C
Explaination / Solution:
Green algae usually have a rigid cell wall made of an inner layer of cellulose and an outer layer of pectose.
Q9. Which classes of algae possess chlorophyll a, chlorophyll b, carotenoids and xanthophylls?
Answer : Option B
Explaination / Solution:
Phaeophyceae possess chlorophyll a, c, carotenoids and xanthophylls. They vary in colour from olive green to various shades of brown depending upon the amount of the xanthophyll pigment, fucoxanthin present in them.
Q10. The process of fusion between one large and non-motile female gamete with smaller, motile male gamete is termed as
Answer : Option D
Explaination / Solution:
Fusion between one large, non-motile female gamete and a smaller, motile male gamete is termed as oogamous e.g., Volvox, Fucus.
