Question Video: Relating Number of Organisms Produced to Levels of Parental Care | Nagwa Question Video: Relating Number of Organisms Produced to Levels of Parental Care | Nagwa

# Question Video: Relating Number of Organisms Produced to Levels of Parental Care Biology • Third Year of Secondary School

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A list of organisms and the average number of offspring they produce per successful fertilization is given below: 1. Human body louse: 4500 eggs (180 a day) 2. Lion: 2–5 cubs 3. Blue whale: 1 calf 4. Clown fish: 100–1,000 eggs. Which organism would you expect to invest the most time and energy in parental care?

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### Video Transcript

A list of organisms and the average number of offspring they produce per successful fertilization is given below. (1) Human body louse: 4500 eggs, 180 a day. (2) Lion: two to five cubs. (3) Blue whale: one calf. (4) Clown fish: 100 to 1000 eggs. Which organism would you expect to invest the most time and energy in parental care?

The question lists four organisms and the average number of offspring they produce per successful fertilization. You might recall that the number of offspring that an organism produces is a tradeoff between quality and quantity. What does this mean? Some organisms, like frogs and fish, will invest their energy into producing a large number of offspring. However, they will not exhibit much parental care, and only a few of their offspring will survive.

Other organisms take a different approach. They use a smaller amount of energy to produce few offspring but use much of their energy in aiding their offspring’s growth and development. Some examples of organisms that use this approach would be penguins or us, humans. So the number of offspring that an organism produces is inversely related to the amount of parental care that they can exhibit.

An inverse relationship just means that as one variable increases, the other will decrease. In this case, as the number of offspring increases, the amount of parental care will decrease. Therefore, an organism that produces the most offspring is predicted to exhibit the least amount of parental care. On the other hand, if an organism produces only one or two offspring, we would expect them to be very engaged in parental care.

Now that we have reviewed the relationship between parental care and number of offspring, we are able to answer our question correctly. Our question asks, “Which organism would you expect to invest the most time and energy in parental care?” So our answer choice should be the organism that produces the fewest offspring. Therefore, the correct answer to this question is the blue whale.

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