Bissoy.com
Doctors Medicines MCQs Q&A

In freshwater and marine cultures, rotifers impair the growth of algae what can be done to curb this?

In freshwater and marine cultures, rotifers impair the growth of algae what can be done to curb this? Correct Answer Lowering the pH

Growth off rotifers in freshwater and marine micro-algal cultures can be checked by lowering the pH of the pond to a value between 2 to 3 and allowing to stand for 1-2 hours. The pH can then be readjusted to 7.5 using potassium hydroxide.

Related Questions

In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct 1. Marine biology is the study of organisms in the ocean. P. At a fundamental level, marine life helps determine the very nature of our planet. Q. Marine life is a vast resource. R. Shorelines are also shaped and protected by marine life. S. Marine organisms contribute significantly to the oxygen cycle. 6. Marine biology covers a great deal, from the microscopic to the huge whales.
In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into fourparts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations iscorrect. 1. Marine biology is the study of organisms in the ocean.
P. At a fundamental level, marine life helps determine the very nature of our planet.
Q. Marine life is a vast resource.
R. Shorelines are also shaped and protected by marine life.
S. Marine organisms contribute significantly to the oxygen cycle.
6. Marine biology covers a great deal, from the microscopic to the huge whales.
Which of the following statements are true? 1. Algae contain chlorophyll. 2. Algae can prepare their own food. 3. Algae do not require water for photosynthesis. 4. Algae needs oxygen as raw material for photosynthesis.
Match List I with List I List I List II Concept Characteristic A. People who live in individualist cultures I. opposes Western approaches to the study of personality in non‐Western settings B. People who live in collectivist cultures II. tests Western ideas about personality in other cultures C.  The cultural‐comparative approach III.  value social harmony, respectfulness, and group needs D. The indigenous approach IV value independence, competition, and personal achievement Choose the correct answer from the options given below:
In each question below is given a statement numbered I, II and III. An assumption is something supposed or taken for granted. You have to consider the following assumption and decide which of the assumption is implicit in the statement. Statement: The June 2018 quarter results of Infosys reflect that the investors waiting for the company to perform as good, if not better, than its largest peer Tata Consultancy Services (TCS) may have to wait a little longer. Infosys, the country’s second-largest software exporter reported slower sequential growth in revenue and profit than TCS for the June quarter (Q1). It also lagged on the fronts of employee attrition and growth in the banking, financial services, and insurance (BFSI) vertical.  Assumptions: I. On the positive side, Infosys continued to add large clients – four in the above $100-million billing category compared with the previous quarter. It continued to retain guidance of 6-8% revenue growth for FY19 while retaining the operating margin band of 22-24%. II. In the near term, the stock performance of TCS is likely to overshadow Infosys given the difference in their growth trajectories. III. The growth momentum of Infosys has slowed relative to TCS. The year-on-year growth in trailing 12-month (TTM) revenue of Infosys in each of the four quarters up to the June 2018 quarter has lagged TCS after leading in the previous five quarters.
Which of the following statements are incorrect about the growth of tourism industry in the world? (A) Steady growth in real incomes of the people in the world has contributed to growth of tourism (B) Increased desire of the people to experience different cultures and landscapes has contributed to tourism growth over time (C) Many countries haste heavily invested in development of tourism infrastructure to encourage tourism (D) There are little range of destinations open for the middle-income group travellers (E) People from developing countries now dominate the global tourism Choose the correct answer from the options given below:
It is possible to produce algae-based biofuels, but what is/are the likely limitation(s) of developing countries in promoting this industry? 1. Production of algae-based biofuels is possible in seas only and not on continents. 2. Setting up and engineering the algae-based biofuels production requires high level of expertise/technology until the construction is completed. 3. Economically viable production necessitates the setting up of large scale facilities which may raise ecological and social concerns. Select the correct answer using the code given below:
In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/ passage and find out which of the four combinations is correct. 1.During a research experiment, a marine biologist placed a shark into a large holding tank and then released several small bait fish into the tank. P. Again, the shark quickly attacked.  This time, however, the shark slammed into the fibreglass divider and bounced off. Q. As you would expect, the shark quickly swam around the tank, attacked and ate the smaller fish. R. The marine biologist then inserted a strong piece of clear fibreglass into the tank, creating two separate partitions.She then put the shark on one side of the fibreglass and a new set of bait fish on the other. S. Eventually, about an hour into the experiment, the shark gave up. 6. The marine biologist then removed the fibreglass divider, but the shark didn’t attack.  The shark was trained to believe a barrier existed.
Consider the following statements regarding algae: 1. Algae are chlorophyll-bearing simple, thalloid, autotrophic and largely aquatic organisms. 2. Algae reproduce only by asexual formation of different types of spores Which of the statements given above is/are correct?
Which of the following statements about Corals is/are correct? 1. Corals have the highest biodiversity among all the ecosystems. 2. Corals are in symbiotic association with the Zooxanthellae algae. 3. Corals provide a protective environment to the algae while algae provides the food to coral by photosynthesis. 4. The Corals are very sensitive to temperature and increase in temperature leads to coral bleaching. Choose the correct answer from the options given below: