CIE Biology Paper-4: Specimen Questions 4 - 6 of 120

Question number: 4

One Liner Question▾

Write in Brief

On which basis ecological pyramids are classified. Define energy relationship in pyramids.

Explanation

Ecological pyramids are classified on different parameters like population number, biomass and energy transfer level. Energy pyramid shows how much energy is available to each organism at each level of food web. The total amount of energy utilizes by different trophic level organisms of an ecosystem in particular area over a fix time. Greater amount of energy is available at producer level then consumer level.

Question number: 5

One Liner Question▾

Write in Brief

Although, DNA stores the information for protein synthesis and RNA carries out the instructions encoded in DNA. What are the main functions of three types of RNA in protein synthesis.

Explanation

  • mRNA carries the genetic information copied from DNA in the form of a series of three-base code
  • tRNA read the message of nucleic acids (nucleotides) and translate it into proteins (amino acids).
  • rRNA in the large subunit of the ribosome and ribosomes translate mRNA into protein

Question number: 6

One Liner Question▾

Write in Brief

Name a disease which caused by genetic abnormality in the gene. Write down its symptoms

Explanation

Sickle cell disease is caused due to genetic abnormality in the gene for hemoglobin, which results in the production of sickle hemoglobin. In this abnormal blood cells block the small blood vessels that supply the body’s tissue.

Symptoms-

  • Anemia
  • Strokes
  • Severe infections
  • sudden changes in body temperature
  • dehydration
  • Sometimes yellowish color of the skin
  • Blockage of blood flow in the spleen or liver
Share