Question

Ground becomes slippery during rainy season because of:

• A. blue algae
• B. green algae
• C. blue green algae
• D. mosses

Answer 1

The correct option is C

blue green algae

The correct option is C.

Explanation of the correct option:

1. Blue-green algae are correct because they are actually types of bacteria known as Cyanobacteria.
2. They normally look green and sometimes may turn bluish when scums are dying.
3. Blue-green algae can cause health issues in humans and problems with taste and odour.
4. Large quantities of blue-green algae may be toxic to humans.

Explanation of the incorrect option:

Option A:

1. Blue algae are incorrect because it is toxic to humans and cause severe sickness.
2. They can cause death to animals as they drink or swim in contaminated water and induces problems in the liver.

Option B:

1. Green algae are incorrect because they are a large, informal grouping of algae consisting of the Chlorophyta.
2. Green algae contain two forms of chlorophyll, which they use to capture light energy to fuel the manufacture of sugars.
3. Food is stored as starch in pyrenoids which are the proteinaceous cores within the plastids.

Option D:

1. Mosses are incorrect because it is a phylum of non-vascular plants and produces spores for reproduction instead of seeds and don't grow flowers, wood, or true roots.
2. Mosses come under the division of plants called the Bryophyta.
3. Mosses break down exposed substrata, releasing nutrients for the use of more complex plants.

Final answer: Ground becomes slippery during the rainy season because of blue-green algae, also known as cyanobacteria.