Question
  1. 'Organisms may be conformers or regulators'. Explain this statement and give one example of each.
  2. Why are there more conformers than regulators in the animal world?

Answer

  1. Some organisms are called conformers because they cannot maintain constant internal environment, e.g. plants. On the other hand, certain organisms are called regulators as they can maintain their internal environment in response to external conditions, e.g. humans.
  2. In the animal world, conformers are more than the regulators because thermoregulation is energetically expensive for many organisms. This is specially true for small animals like shrews and humming birds. Heat loss and heat gain is a function of surface area. Since, small animals have a larger surface area relative to their volume, they tend to loose body heat very fast.

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

Similar questions

Draw a schematic transverse section of a mature anther of an angiosperm. Label its epidermis, middle layers, tapetum, endothecium, sporogenous tissue and the connective.
Explain co-evolution with reference to parasites and their hosts. Mention any four special adaptive features evolved in parasites for their parasitic mode of life.
OR
Explain parasitism and co-evolution with the help of one example of each.
AIDS.
Explain the following two components of Darwin's theory of natural selection.
  1. Variations.
  2. Formation of new species.
Enlist the different parts of the brain.
Draw a diagram of the microscopic structure of human sperm. Label the following parts in it and write their functions.
  1. Acrosome.
  2. Nucleus.
  3. Middle piece.
OR
Draw a diagram of a human sperm. Label only those parts along with their functions, that assist the sperm to reach and gain entry into the female gamete.
Name the hormonal composition of the oral contraceptive used by human females. Explain how does it act as a contraceptive?
Monocistronic structural genes in eukaryotes have interrupted coding sequences. Explain. How are they different in prokaryotes?
What are the three divisions of nervous system? What are their chief functions?
Two types of aquatic organisms in a lake show specific growth patterns as shown below, in a brief period of time. The lake is adjacent to an Time - agricultural land extensively supplied with fertilisers. Answer the questions based on the facts given above.
  1. Name organisms depicting patterns A and B.
  2. State the reason for the growth patterns seen in A.