ENRICHMENT ACTIVITY

Why does the lymph node swell and become painful?

• Because fats clog in it

• Because the lymph node did not grow properly

• Because there are too many harmful substances in the lymph node

• Because the food supply is low

When a person is suffering from night sweating, night fever, chest pain, loss of weight and blood in sputum, what respiratory ailment is he most likely afflicted with?

• tuberculosis

• asthma

• atelectasis

• emphysema

Discrete variations are differences in characteristics that have a definite form with a limited number of possibilities. Which among these traits is an example of discrete variation?

• arm span

• type of ear lobe (free or joined)

• artistic ability

• height

A Mendelian trait is controlled by one locus and gives a simple inheritance. The following are Mendelian traits in humans EXCEPT _____.

• albinism

• widow’s peak

• wet or dry ear wax

• shortness of fingers and toes

Answer explanation

Mendelian inheritance refers to an inheritance pattern that follows the laws of segregation and independent assortment in which a gene inherited from either parent segregates into gametes at an equal frequency.

People are born with albinism when they inherit an albinism gene from their parents.

Which of these organisms would most likely be found at the second trophic level of the food pyramid in a pond ecosystem?

• phytoplankton

• zooplankton

• waterfowl

• fish

Which statement describes the difference between photosynthesis and respiration?

• Photosynthesis occurs in the presence of sunlight; while respiration occurs at all times.

• In photosynthesis, oxygen is absorbed, while respiration, carbon dioxide is absorbed.

• Photosynthesis occurs in the mitochondria, while respiration occurs in chloroplasts.

• Photosynthesis releases energy, while respiration absorbs energy.

In general, the more complex an ecosystem is, the more likely it is to recover after being disturbed. In which biome will damage caused by human activity persist for a long time?

• temperate deciduous forest

• tropical rainforest

• tundra

• taiga

A non-polar covalent bond is formed when atoms share their electrons equally. This usually occurs when two atoms have the same electron affinity. Which of the following compounds is held together by a non-polar covalent bond?

• 
• 
• 
• 

What type of bond is formed between metals and non-metals?

• non-polar covalent bond

• polar covalent bond

• hydrogen bond

• ionic bond

Which statement describes metallic bonds?

• It is the attraction between ions of opposite charge.

• It is the attraction that involves sharing of electrons.

• It is the attraction that involves transfer of electrons.

• It is the attraction between conduction electrons and positively charged metal ions.