LET Reviewer in General Education
|LET Reviewer for General Education|
GENERAL | NATURAL SCIENCE
1. Which is not considered as adaptive mechanism of living things?
a. Modification of body parts to suit the environment.
b. Presence of specialized structures like thorns and fins.
c. Possession of camouflage features like color, pattern or shape.
d. Reproduction for the preservation of a certain species.
2. Biologists are at present involved in gene manipulation by altering the genes in nuclei. Which aims seem to be the most important of such manipulation?
a. to cure ancient genetic diseases like cancer
b. to prolong life
c. to create new types of agricultural plants and animals
d. to make significant changes in man himself
3. Which chemical substance produced by the body regulates and coordinates the functions and activities of bodily organ?
b. Deoxyribonucleic acid
4. Which endocrine abnormality is characterized by dwarfness, low intelligence and sex immaturity?
5. What is the present connotation of symbiosis?
a. a give and take relationship of organism
b. any type of relationship between two dissimilar organisms living together
c. a one- sided relationship between two species
d. neutral relationship that exist between two organisms
6. Living things are classified either as aerobic or anaerobic as they grow or metabolize in the presence or absence of:
a. carbon dioxide
7. What is the structural difference between plants and animals?
a. Plant cells have plastids but animal cells do not.
b. Plant cells have a stiff cell wall of cellulose but animal cells do not.
c. Animal cells have centriole but the cells of higher plants do not.
d. Plant cells have only a thin membrane but animals do not.
8. Only living things can respond to stimuli, to physical and chemical changes in their environment. Such a characteristic is called:
d. specific organization
9. The preservation of specie is made possible through:
10. Which process involves in the movement of dissolved molecules (solute) through a differentially permeable membrane?
c. Brownian movement
11. Which refers to the earth’s entire zone of air, land and water which occupied by living things?
12. Which body organ is responsible for the removal of waste from the blood and body fluids?
d. large intestine
13. What is meant by excretion?
a. Elimination of waste and undigested food from the anus.
b. Removal from the cells and blood streams of substances which are no further use in the body.
c. Release from the cell of some substance that is utilized elsewhere in some bodily process.
d. Absorption of soluble food by the body cells.
14. The clotting of the blood is essentially the function of:
a. red blood cells
b. white corpuscles
15. All living things have a tendency to maintain uniformity or stability in their internal environment called:
16. What is an ecosystem?
a. A basic unit that shows interaction between living things and their environment.
b. A recognizable unit which shows plant and animal distribution as influenced primarily by climate.
c. A fundamental unit that shows various types of relationship among organism.
d. A distinct unit that shows how physical factor can affect other abiotic components in the environment.
17. Which plant structure transports organic nutrients both up and down the stem and roots?
b. vascular bundle
18. Under what condition does a living organism live best or has the greatest chance of survival?
19. Which traps light energy from the sun for use in the photosynthesis?
a. carbon dioxide
20. Smoking cigarettes:
a. causes ulcer
b. decreases the vital capacity of the stomach
c. leads to emphysema and lung cancer
d. leads to abnormal life
21. Blood cells and plasma factors are important:
a. immune defense
c. external defenses
d. internal defenses
22. A spinal nerve is:
a. motor nerve
b. sensory nerve
d. mixed nerve
23. The anterior pituitary stimulates the:
a. motor coordination
c. sense reception
24. What do all methods of birth control have in common?
a. they all use some device
b. they are all expensive
c. they interrupt lovemaking
d. they prevent the egg from coming in contact with the sperm
25. Pregnancy begins:
a. upon successful implantation
b. during the follicular phase
c. when the egg is fertilized
d. when ovulation occurs
26. The fact that many insects are now immune to DDT is an example of:
a. natural selection
b. genetic drift
c. geographical isolation
27. The nutrient glucose is useful to the body:
a. to prevent goiter
b. as a source of energy
c. active reabsorption
d. during the process of respiration
28. Radiant energy is covered into chemical energy during:
29. Which of the following is not a form of vegetative reproduction?
c. spore formation
d. vegetation by runners
30. Nitrogenous waste is produced by the metabolism of:
31. Which of the following is a reflex act?
32. In an ecosystem:
a. only energy is recycled
b. only materials are recycled
c. both materials and energy are recycled
d. neither materials nor energy is recycled
33. Distribution of plants is affected by:
a. type of soil
b. amount of light
c. amount of rainfall
d. A, B, and C are correct
34. Which decoction contains traces of iron to arrest hemorrhage?
a. corn silk
b. ampalaya leaves flowers
d. coconut milk
35. Hyperacidity can destroy the lining of the stomach. Which of the following substance can ease the discomfort?
a. water therapy
b. milk of magnesia
c. starch solution
36. Deficiency of carbohydrates is characterized by:
d. bone deformation
37. Salt as a preservative causes:
a. cell shrinkage
38. What do you call the practical or industrial application based on scientific principles?
a. scientific method
39. What is the principal cause of earthquakes?
c. nuclear explosions
d. volcanic eruptions
40. Purification of metals can be done best by:
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