Question
Give scientific Reson
Closed circulation is more efficient than open circulation.

Answer

  1. Closed circulation considerably enhances the speed, precision and efficiency of circulation.
  2. The blood flows more rapidly, it takes less time to circulate through the closed system and return to the heart.
  3. This fastens the supply and removed of materials to and from the tissues by the blood as compared to open circulation.
  4. In open circulation, there are no blood vessels such as arteries or veins, to pump the blood.
  5. Therefore, the blood pressure is very low.
  6. Organisms with an open circulatory system typically have a relatively high volume of hemolymph and low blood pressure. Closed circulation is thus more efficient than open circulation.

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

Explain why Bt cotton flowers undergo pollination by butterflies and bees inspite of being insect pest resistant?
  1. What are transgenic animals?
  2. Name the transgenic animal having the largest number amongst all the existing transgenic animals.
  3. Mention any three purposes for which these animals are produced.
What are Cry proteins? Name an organism that produce it. How has man exploited this protein to his benefit?
Explain convergent and divergent evolution with the help of one example of each.
Enlist dominant and recessive characters in pea plant with respect to the position of flower, colour of seed and colour of a pod in tabulated form.
As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.
Study the figure given:
  1. Pick out and name the cells that undergo spermiogenesis.
  2. Name 'a' and 'b' cells. What is the difference between them with reference to the number of chromosomes?
  3. Pick out and name the motile cells.
  4. What is 'f'cell? Mention its function.
  5. Name the structure of which the given diagram is a part.
Explain with the help of an example each, male and female heterogamety mechanisms of sex determination.
Answer the following questions:
How does cleistogamy ensure autogamy?
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