Home
Class 11
BIOLOGY
Algal bloom is caused by...

Algal bloom is caused by

A

Availability of excess nutrients

B

Lack of nutrients

C

Increase in non - biodergradable pollutants

D

Decreased BOD

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Algal Bloom**: - Algal bloom refers to the rapid increase in the population of algae in a water body, which can lead to discoloration of the water. The color can vary based on the type of algae present. 2. **Causes of Algal Bloom**: - The primary cause of algal bloom is the availability of excess nutrients, particularly nitrogen and phosphorus. These nutrients often come from agricultural runoff, where fertilizers are used extensively. 3. **Impact of Nutrients**: - When fertilizers enter the water body, they increase the nutrient levels, which promotes the rapid growth of algae. This can lead to dense algal mats that block sunlight from penetrating the water. 4. **Consequences of Algal Bloom**: - As algae grow excessively, they can deplete oxygen levels in the water, leading to hypoxic conditions. This can result in the death of aquatic organisms that rely on oxygen for survival. 5. **Evaluating Options**: - **Option 1: Availability of excess nutrients** - This is correct as it directly leads to algal bloom. - **Option 2: Lack of nutrients** - This is incorrect because a lack of nutrients would inhibit algal growth. - **Option 3: Increase in non-biodegradable pollutants** - This is also incorrect as these pollutants do not promote algal growth. - **Option 4: Decrease in BOD** - This is incorrect because a decrease in BOD indicates less organic matter, which does not contribute to algal growth. 6. **Conclusion**: - The correct answer to the question "Algal bloom is caused by" is **Option 1: Availability of excess nutrients**. ---
Promotional Banner

Similar Questions

Explore conceptually related problems

Algal blooms are

Algal bloom in lakes

A factory drains its waste water into the nearly lake. It has caused algal bloom. (a) How was the algal bloom caused ? (b) What would be the consequences ? (c) Name the phenomenon that caused it .

Algal bloom in a lake

Algal bloom cause a. fish mortality. b. deterioration of water quality. c. increased oxygen in water body. d. control of water pollution.

Plenty of algal bloom is observed in a pond in your locality. a) Write what has caused this bloom and how does it affect the quality of water. b) Suggest a preventive measure.

The Algal bloom

The Algal bloom

Algal blooms in winter bodies cause

How does an algal bloom cause eutrophication of a water body? Name the weed that can grow in such a eutrophic lake.