Directions: This group of questions deals with biological situations. Each situation is followed by a set of questions. Select the best answer for each question.

Here are the answers to questions 31-42:

31) The process that releases carbon dioxide into the atmosphere is:
C. Respiration.
Respiration is the metabolic process by which organisms obtain energy by reacting oxygen with glucose to produce carbon dioxide and water.

32) Controls balance and posture:
B. Cerebellum.
The cerebellum is a major part of the brain responsible for coordinating voluntary movements, balance, and posture.

33) A pair of non-identical genes for the same characteristics:
D. Heterozygous.
A heterozygous individual has two different alleles for a particular gene.

34) An association between two organisms in which both benefit:
C. Mutualism.
Mutualism is a symbiotic relationship where both organisms involved benefit from the association.

35) A natural self-sustaining unit:
D. Ecosystem.
An ecosystem consists of a community of living organisms interacting with their non-living environment, forming a self-sustaining unit.

36) Produced during fright:
D. Adrenaline.
Adrenaline (epinephrine) is a hormone released by the adrenal glands in response to stress or fear, preparing the body for a "fight or flight" response.

37) Causes malaria:
A. Plasmodium.
Malaria is caused by the Plasmodium parasite, which is transmitted to humans through the bite of infected female Anopheles mosquitoes.

38) Its deficiency will lead to anaemia:
C. Iron.
Iron is a crucial component of hemoglobin, the protein in red blood cells that carries oxygen. A deficiency in iron can lead to iron-deficiency anemia.

39) Used for tearing of flesh:
B. Canine.
Canine teeth are pointed and sharp, adapted for piercing and tearing food, especially flesh in carnivores and omnivores.

40) Is an air pollutant:
A. Lead particles.
Lead particles, often from industrial emissions or historical use of leaded gasoline, are a significant air pollutant with harmful health effects.

41) When red blood corpuscles were mounted in distilled water for 20 minutes, only cell fragments remained in solution. This is due to:
B. Osmosis.
Red blood cells placed in distilled water (a hypotonic solution) will absorb water by osmosis, swell, and eventually burst (hemolysis) because they lack a cell wall to prevent over-expansion.

42) In many perennial plants, soluble products of photosynthesis are transported from the leaves to underground storage organs. This is possible through:
C. Translocation.
Translocation is the process by which sugars and other organic molecules produced during photosynthesis are transported through the phloem from source (e.g., leaves) to sink (e.g., storage organs, roots).