LET Reviewer -General Education-Natural Science Part-4 (50 Items)

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NATURAL SCIENCE (4)
1) Solar eclipse occurs when ________.
a. The Moon is between the Earth and the Sun.
b. The Earth is between the Moon and the Sun.
c. The Sun is between the Earth and the Moon.
d. The Earth is behind the Sun.

2) What phase of the Moon is observed when it cannot be seen at all because it passes directly between the Earth and the Sun?
a. New Moon
b. First quarter
c. Last Quarter
d. Full Moon

3) Fossils are mostly to be found in ________.
a. Sedimentary rocks
b. Igneous rocks
c. Metamorphic rocks
d. Plutonic rocks

4) Tropical disturbances are classified as tropical depression, tropical storm or typhoon. This classification is based on the ________.
a. Amount of rainfall
b. Strength of the accompanying winds
c. Amount of rainfall and strength of accompanying winds
d. Origin of formation

5) The Philippines lies in the region where many volcanoes are active. This region is known as:
a. Wheel of Fire
b. Ring of Fire
c. Volcanic Rim
d. Archipelagic Fault Line

6) The following means help in controlling floods, EXCEPT:
a. Reforestation
b. Deforestation
c. Crop rotation
d. Construction of flood ways

7) Petroleum is formed by the ________.
a. decay of microorganisms under heat and pressure
b. heat from radioactive substances found in the mantle
c. volcanic eruptions that burn living matters
d. steam trapped underneath a geologic column

8) Farmers add commercial fertilizers to the soil to ________.
a. Speed up the decay of bacteria
b. Add mineral content
c. Activate the growth of earthworms
d. Enhance the growth of the roots

9) All of the following are reasons why terraces are built in Mountain Province, EXCEPT:
a. to accommodate excess run of water
b. to provide space for planting rice
c. to make the place beautiful
d. to provide steps for the natives to go up hill

10) When a plant cell is placed in a hypertonic solution, the plant cell will:
a. expand
b. rupture
c. shrink
d. have no effect on the plant cell.

11) Which of the following organisms is included in the Kingdom Plantae?
a. Magnolidae
b. Fungi
c. Protozoa
d. Prokaryotes

12) Which part of the brain is responsible for intelligence, memory and learned behavior?
a. Cerebellum
b. Cerebrum
c. Medulla
d. Thalamus

13) What is most likely happen when a species cannot adapt to the changes in the environment?
a. It will be transform to another form
b. It will become extinct
c. It will be isolated
d. It will grow old

14) A cold-blooded animal is one that ________.
a. lacks red corpuscles
b. lacks white corpuscles
c. has a variable body temperature
d. has a fixed body temperature

15) Spiders can be distinguished from insects by the fact that spiders have ________.
a. hard outer covering
b. four pairs of legs
c. large abdomens
d. biting mouth parts

16) A lot of malnourished children in Africa are found to have poor teeth and eyesight. This is believed to be caused by deficiency in ________.
a. Vitamin A and D
b. Iodine
c. Vitamin C
d. Iron

17) The two chemical factors that can cause decomposition are:
a. death and cellular respiration
b. autolysis and photosynthesis
c. autolysis and putrefaction
d. putrefaction and respiration

18) How will genetic drift affect the population of rabbits that are living in a stable habitat with no changes in the environment?
a. It will increase the population of the rabbits.
b. It will decrease the genetic variation of the rabbits
c. It will develop the dominance and superior traits of the rabbits. d. It will enhance the appearance of new traits of the rabbits.

19) Which of the following is under the grass family?
a. Bamboo
b. Fern
c. Moss
d. Mushroom

20) The appendix, though a part of the large intestine, has no digestive function. It is therefore called:
a. a heterogeneous organ
b. a vestigal structure
c. an addendum organ
d. an analogous structure

21) Which of the following is the by-product of photosynthesis?
a. Oxygen
b. Nitrogen
c. Carbon dioxide
d. Carbohydrates

22) The protein shell of a virus is called ________.
a. Nucleolus
b. Capsid
c. Nucleus
d. Nucleic acid

23) What theory of evolution accounts for snake’s disappearance of legs and development of giraffe’s long neck?
a. Theory of use and disuse
b. Theory of natural selection
c. Theory of chromosomal change
d. Theory of action and interaction

24) ________ is an aquatic blood-sucking annelid worm that can be used to facilitate anticoagulation:
a. Earthworm
b. Leech
c. Flatworm
d. Remora

25) Which of the following is an example of non-pathogenic microorganisms?
a. Probiotics such as lactobacilli
b. Yersenia pestis
c. Plasmodium vivax
d. Influenza SP

26) What stage in chicken pox considered very contagious?
a. When wounds are peeling off
b. When wounds have swollen
c. When all wounds have disappeared
d. During the first week

27) The main organ for respiration is the ________.
a. Nose
b. Lungs
c. Esophagus
d. Trachea

28) Which chemical substance produced by the body regulates and coordinates the functions and activities of bodily organs:
a. gene
b. deoxyribonucleic acid
c. hormone
d. enzyme

29) All of the following are autotrophs, EXCEPT:
a. Fern
b. Grasshopper
c. Herb
d. Grass

30) What organism would most likely be in arctic environment?
a. Frog
b. Tutle
c. Rice birds
d. Walrus

31) Which of the following best describes the science of Ecology?
a. Living things
b. Rocks
c. Life and Environment
d. Weather and Climate

32) What do you call the natural environment where a certain organism lives and thrives?
a. Community
b. Habitat
c. Country
d. Ecosystem

33) When water from a river is mixed with sewage in a septic tank, water pollution occurs and this is called ________.
a. Eutrophication
b. Hypertrophication
c. Hydrolysis
d. Water condensation

34) The Kyoto Protocol requires the reduction of greenhouse gases in the environment. This practice advocates:
a. Environmental protection
b. Energy conservation
c. Ecological destruction
d. Sustainable development

35) Which body organ is responsible for the removal of waste from the blood and body fluids?
a. liver
b. pancreas
c. kidney
d. large intestine

36) At present, scientists report about the formation of holes in the ozone layer of the atmosphere. This dangerous trend is being blamed on which of the following wrong practices?
a. The use of ozone itself on the surface or the Earth.
b. The excessive use of aerosols.
c. Removal of the protective cover like the green plants.
d. The use of soil fertilizers on Earth.

37) Where do producers obtain their energy?
a. From other producers
b. From the consumers
c. From the decomposers
d. From the sun

38) What term is used to describe the ability to maintain a constant internal environment?
a. Metabolism
b. Growth and Development
c. Homeostasis
d. Thermoregulation

39) What is the most common cause of cardiovascular disease?
a. Fatty deposits in the arteries
b. Inadequate supply of red blood cells
c. Lack of sodium in the diet
d. Increased heartbeat

40) Which is the smallest unit of life that can survive and reproduce on its own?
a. Cell
b. Organ
c. Tissues
d. Population

41) Which region of a vertebrate forebrain is considered with the neutral-endocrine control of visceral activities?
a. Cerebellum
b. Thalamus
c. Hypothalamus
d. Pituitary

42) Which of the following is the building block of carbohydrates?
a. Amino acid
b. Nucleotide
c. Fatty acid
d. Monosaccharide

43) Why it is necessary men have more red blood cells per cubic millimeter of blood than women?
a. Man does strenuous activities and need more energy
b. They have bigger physique and need more blood
c. Man waste more blood cells and need extra
d. They are more prone to anemia disorders

44) Which of the following is the building block of protein?
a. Amino acid
b. Nucleotide
c. Fatty acid
d. Monosaccharide

45) Why are our lips “redder” than our palm?
a. There is increased blood flow in the lips
b. Lips are heavily keratinized
c. Lip epidermis is thinner
d. Many blood vessels are located around the lips

46) What is the branch of zoology that is devoted to the study of fish?
a. Helminthology
b. Ichthyology
c. Entomology
d. Ornithology

47) We feel warmer just before it rains because __________.
a. Heat is released by the evaporation of water
b. The clouds prevent heat from escaping the earth
c. There is an increased relative humidity
d. Heat is released by the condensation of water vapor

48) Which of the following is not considered as a reproductive cell?
a. Gamete
b. Somatic cell
c. Egg cell
d. Sperm cell

49) What is that flap-like structure that prevents the food from going the wrong way during swallowing?
a. Epiglottis
b. Larynx
c. Esophagus
d. Pharynx

50) Where does ectopic pregnancy occur?
a. Uterus
b. Ovary
c. Cervix
d. Fallopian tube

NATURAL SCIENCE (4) ANSWERS:
1. A
2. A
3. A
4. B
5. B
6. B
7. A
8. B
9. C
10. C
11. A
12. B
13. B
14. C - Amphibians and reptiles are examples of cold-blooded animals. The body temperature of cold-blooded animals changes with the temperature of the environment.
15. B - The spiders is one of the organisms that belongs to class Arachnida. Arachnids have four pairs of legs while insects have only three pairs of legs.
16. A
17. C
18. C
19. A - Bamboo is considered as the largest grass.
20. B
21. A
22. B
23. A
24. B
25. A - Non-pathogens are microorganisms that do not cause diseases. Lactobacilli, which are inside the intestine helps digests food.
26. D
27. B
28. C
29. B
30. D
31. C
32. B
33. B
34. A
35. C
36. B
37. D
38. C
39. A
40. A
41. C
42. D
43. A
44. A
45. C
46. B
47. D
48. B
49. A
50. D


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