31. From the information above, determine the percentage of water in the given soil sample?
- A. 20%
- B. 25%
- C. 40%
- D. 50%
32.
I. Stomata –> Spirogyra
II. Alveoli –> Earthworm
III. Malpighian tubule -> Mammal
IV. Contractile vacuole -> Protozoa
Which of the above structures is correctly matched with the organisms in which it is found?
- A. II
- B. I
- C. IV
- D. III
33. The sequence of the one-way gaseous exchange mechanism in a fish is
- A. mouth –> operculum -> gills
- B. mouth -> gills > operculum
- C. operculum > gills -> mouth
- D. gills -> operculum –> mouth
34. Which of the following is true in blood transfusion?
- A. A person of blood group AB can donate blood only to another person of blood group AB
- B. Persons of blood groups A and B can donate or receive blood from each other
- C. A person of blood group AB can receive blood only from persons of blood group A or B
- D. A person of blood group O can donate only to a person of blood group O
35. The plants that grow in deserts or very dry areas are referred to as
- A. hydrophytes
- B. epiphytes
- C. xerophytes
- D. mesophytes
36. A pollutant that is biodegradable is
- A. heavy metals
- B. cellophane
- C. sewage
- D. crude oil
37. The movement of part of a plant in response to external stimulus of no particular direction is
- A. taxism
- B. tropism
- C. haptotropic movement
- D. nastic movement
38. The mutation theory of organic evolution was propounded by
- A. Gregor Mendel
- B. Hugo de Vries
- C. Jean Lamarck
- D. Charles Darwin
39. If both parents are heterozygous for a trait. the probability that an offspring will be recessive for that trait is
- A. 1/2
- B. 1/4
- C. 1
- D. ¾
40. Blood circulation in a mammal is said to be double because
- A. it passes twice through the heart in a complete circuit
- B. it moves in both arteries and veins
- C. it circulates in both the heart and other organs
- D. the heart contains auricles and ventricles
