Download App

Organisms and Populations — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYOrganisms and Populations3 Marks
Question
Why is predation important and required in a community with rich biodiversity? Explain with the help of suitable examples.

OR

What is 'predation"? Explain with the help of suitable examples, why it is required in a community with rich biodiversity.

✓

Answer

  1. Predators act as conduits for energy transfer across trophic levels. They transfer the energy fixed by the plants to higher trophic levels.
  2. They help in maintaining species diversity by reducing the intensity of competition among the prey species.
  • In the rocky intertidal zones of the American Pacific Coast, the starfish Pisaster is a predator.
  • In a field experiment, when all the starfish were removed from an enclosed area, more than ten species of invertebrates became extinct within a year, due to interspecific competition.
  1. They keep the prey population under control and thereby prevent the ecosystem instability.
  • A cactus introduced into Australia in 1920s caused havoc by spreading rapidly into millions of hectares of the land.
  • Later, this was brought under control by introducing a cactus-feeding moth (a predator) from its natural habitat.

Predation is the interspecific interaction in which a large animal, called predator, kills and consumes a smaller animal, called prey.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from Organisms and Populations→Organisms and Populations — all question types→BIOLOGY STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

If a double stranded DNA has 20 per cent of cytosine, calculate the per cent of adenine in the DNA.
→
What are ecological pyramids. Which point should be kept in mind while calculating it. Draw a diagram of energy pyramid of a grass ecosystem.
→
Answer the following questions with reference to opioids, the commonly abused drug :
a. Where in our body are the specific opioid receptors present?
b. What is heroin chemically known as?
c. Write the scientific name of the plant from which opioids are extracted.
→
What are the measures one has to take to prevent from contracting STDs?
→
Which part in the male reproductive system stores sperms?
→
How is DNA recombinant technology helpful in detecting the presence of mutated genes in the cancer patients?
→
During his studies on genes in Drosophila that were sex-linked T.H. Morgan found F2 -population phenotypic ratios deviated from expected 9:3:3:1. Explain the conclusion he arrived at.
→
Two independent monohybrid crosses were carried out involving a tall pea plant with a dwarf pea plant. In the first cross, the offspring population had equal number of tall and dwarf plants, whereas in the second cross it was different. Work out the crosses, and explain giving reasons for the difference in the offspring populations.
→
What is the significance of the slope of regression in a species-area relationship?
→
Identify giving reasons, the salient features of genetic code by studying the following nucleotide sequence of mRNA strand and the polypeptide translated from it.
AUG UUU UCU UUU UUU UCU UAG
Met - Phe - Ser - Phe - Phe - Ser
→