BIOLOGY 9

Levels of endangerment of species from least to most severe.

• endangered, vulnerable, critically endangered

• vulnerable, critically endangered, endangered

• vulnerable, endangered, critically endangered

• critically endangered, vulnerable, endangered

Species which is likely to become endangered if no conservation had taken place.

• vulnerable

• critically endangered

• extinct

• endangered

In a human, how many chromosomes are present?

• 22

• 23

• 44

• 46

How asthma affects the respiratory system?

• causes inflammation and narrowing of the airways= difficulty in breathing

• increases the production of surfactant in alveoli= lung collapse

• enhances the elasticity of lungs=improving breathing

• permanently damages alveoli= loss of lung function

How would you differentiate the effects of emphysema and chronic bronchitis?

• emphysema=reversible with medication;
  bronchitis=irreversible

• emphysema=airways obstruction;
  bronchitis=destruction of alveolar walls

• emphysema=enlargement and destruction of alveoli;
  bronchitis=inflamed airways and excessive mucus production

• both are characterized by destruction of the bronchial tubes and alveoli

Difference between the function of bronchi and bronchioles.

• bronchi=gas exchange;
  bronchioles=air filtration

• bronchi=oxygen absorption;
  bronchioles=removes carbon dioxide from blood stream

• both have same function

• bronchi=air transport into lungs;
  bronchioles= regulate airflow and distribute air to the alveoli for gas exchange

What do you think will happen if you kept on inhaling using your mouth?

• enhances the filtration process

• increasing the likelihood of inhaling dust, pollens and other particles

• allows better humidification

• reduces the risk of infection

What do you call the upper chambers of the heart?

• atria

• septa

• valves

• ventricles

What do you call the lower chambers of the heart?

• atria

• septa

• valves

• venticles

Function of veins in the circulatory system.

• To carry blood back to the heart

• to transport nutrients to the heart

• to carry blood away from the heart

• to carry oxygen-rich blood from the heart