Question
How do scientists extrapolate the total number of species on Earth?
✓
Answer
Scientists make a statistical comparison of the temperate-tropical species richness of an exhaustively studied group of insects and extrapolate this ratio to other groups of animals and plants to come up with a gross estimate of the total number of species on earth.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Draw a labelled diagram of male reproductive system.
The following graph represents the organismic response to certain environmental condition (e.g. temperature):
- Which one of these, 'a' or 'b', depicts conformers?
- What does the other line graph depict?
- How do these organisms differ from each other with reference to homeostasis?
- Mention the category to which humans belong.
Study the table showing the population interaction between species Z and Y respectively. Assign the appropriate +/- signs for A, B, D, E and respective interactions for C and F.
| Species 'Z' | Species 'Y' | Name of Interaction |
| A | B | Mutualism |
| - | - | C |
| D | E | Parasitism |
| + | O | F |
Is there any relationship between dedifferentiation and the higher degree of success achieved in plant tissue culture experiments?
- Write the importance of measuring the size of a population in a habitat or an ecosystem.
- Explain with the help of an example how the percentage cover is a more meaningful measure of population size than more numbers.
Explain the pyramid of energy in ecosystem. ###What is meant by ecological pyramid? Describe an ideal pyramid of energy with diagram.
Answer the following questions:
Why is geitonogamy also referred to as genetical autogamy?
Why is geitonogamy also referred to as genetical autogamy?
- How is ozone formed in the 'stratosphere'?
- CFCs contribute to ozone hole formation. Explain.
Some parents wrote a complaint letter to the local municipality to remove all the hoardings in the city, advertising the use of condoms and matters relating to AIDS prevention. The children of these parents came to know about the matter and raised their voice against removal of the hoardings. The parents were convinced by the awareness level of their children and withdrew the complaint.
- Parents considered the hoarding as inappropriate. Do you agree/ disagree with their view?
- What are the methods by which AIDS spreads?
- What is AIDS?
- What values are promoted by the children protesting against their parents?
What is cancer? How is a cancer cell different from the normal cell? How do normal cells attain cancerous nature?