R#1: NATURAL SCIENCE1. 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 cancerb. to prolong lifec. to create new types of agricultural plants and animalsd. 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?a. geneb. Deoxyribonucleic acidc. hormoned. enzyme

4. Which endocrine abnormality is characterized by dwarfness, low intelligence and sex immaturity?a. myxedemab. cretinismc. tetanyd. acromegaly

5. What is the present connotation of symbiosis?a. a give and take relationship of organismb. any type of relationship between two dissimilar organisms living togetherc. a one- sided relationship between two speciesd. 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 dioxideb. nitrogenc. waterd. oxygen

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:a. metabolismb. irritabilityc. movementd. specific organization

9. The preservation of specie is made possible through:a. reproductionb. adaptationc. metabolismd. growth

10. Which process involves in the movement of dissolved molecules (solute) through a differentially permeable membrane?a. diffusionb. osmosisc. Brownian movementd. dialysis

11. Which refers to the earths entire zone of air, land and water which occupied by living things?a. biosphereb. biomec. bioassayd. biomass

12. Which body organ is responsible for the removal of waste from the blood and body fluids?a. liverb. pancreasc. kidneyd. 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 cellsb. white corpusclesc. plasmad. hemoglobin

15. All living things have a tendency to maintain uniformity or stability in their internal environment called:a. anabolismb. metabolismc. epigenesistd. homeostasis

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?a. xylemb. vascular bundlec. parenchymad. phloem

18. Under what condition does a living organism live best or has the greatest chance of survival?a. maximalb. minimalc. optimumd. standard

19. Which traps light energy from the sun for use in the photosynthesis?a. carbon dioxideb. waterc. chlorophylld. oxygen

20. Smoking cigarettes:a. causes ulcerb. decreases the vital capacity of the stomachc. leads to emphysema and lung cancerd. leads to abnormal life

21. Blood cells and plasma factors are important:a. immune defenseb. invadersc. external defensesd. internal defenses

22. A spinal nerve is:a. motor nerveb. sensory nervec. neurond. mixed nerve

23. The anterior pituitary stimulates the:a. motor coordinationb. consciousnessc. sense receptiond. homeostasis

24. What do all methods of birth control have in common?a. they all use some deviceb. they are all expensivec. they interrupt lovemakingd. they prevent the egg from coming in contact with the sperm

25. Pregnancy begins:a. upon successful implantationc. when the egg is fertilizedb. during the follicular phased. when ovulation occurs

26. The fact that many insects are now immune to DDT is an example of:a. natural selectionb. genetic driftc. geographical isolationd. translocation

27. The nutrient glucose is useful to the body:a. to prevent goiterc. active reabsorptionb. as a source of energyd. during the process of respiration

28. Radiant energy is covered into chemical energy during:a. oxidationb. glycosisc. respirationd. photosynthesis

29. Which of the following is not a form of vegetative reproduction?a. regenerationb. buddingc. spore formationd. vegetation by runners

30. Nitrogenous waste is produced by the metabolism of:a. fatsb. carbohydratesc. proteinsd. starches

31. Which of the following is a reflex act?a. breathingb. blinkingc. walkingd. sleeping

32. In an ecosystem:a. only energy is recycledc. both materials and energy are recycledb. only materials are recycledd. neither materials nor energy is recycled

33. Distribution of plants is affected by:a. type of soilb. amount of lightc. amount of rainfalld. A, B, and C are correct

34. Which decoction contains traces of iron to arrest hemorrhage?a. corn silkb. ampalaya leaves flowersc. gumamelad. coconut milk35. Hyperacidity can destroy the lining of the stomach. Which of the following substance can ease the discomfort?a. water therapyb. milk of magnesiac. starch solutiond. gelatin

36. Deficiency of carbohydrates is characterized by:a. sluggishnessb. pallorc. obesityd. bone deformation

37. Salt as a preservative causes:a. cell shrinkageb. ionizationc. hydrolysisd. hydration

38. What do you call the practical or industrial application based on scientific principles?a. scientific methodb. technologyc. theoryd. experimentation

39. What is the principal cause of earthquakes?a. faultingb. landslidesc. nuclear explosionsd. volcanic eruptions

40. Purification of metals can be done best by:a. filtrationb. flotationc. aerationd. electrolysis