Unit Test1 REVIEWER FOR 7 TH GR SCIENCE PREPARED BY MRS. L. TRAYA SCIENCE TEACHER WAMS

Which cell organelle is affected due to turgor pressure? A.Nucleus C. Cell Membrane B.Cytoplasm D. Vacuole

Answer: D. Vacuoles

A Plant’s respond due to dehydration or lack of water is called- A.Turgid or Rigid B.Wilting C.Healthy D.A and C

Answer: B. Wilting

The plant below is showing the process of photosynthesis. Which energy transformation occurs during photosynthesis process? A. mechanical  chemical B. radiant  chemical C. heat  mechanical D. radiant  mechanical

Answer: B. Radiant energy to Chemical energy

The structures on the leaves above are called stomata. Which Of these is the correct job of the stomata during photosynthesis? F. Stomata absorb water from the soil G. Stomata capture radiant energy from the sun H. Stomata allow exchange of carbon dioxide and oxygen I. The job of stomata cannot be determined

Answer: H. Stomata allow exchange of carbon dioxide and oxygen gases during photosynthesis.

Plants during photosynthesis process, use special Cell structures or organelles called Chloroplasts to make glucose. Which of these correctly describes the function of the chloroplasts? A.Allow exchange of gases CO 2 and O 2 B.Capture or trap radiant energy and convert it to chemical energy C.Absorb O 2 and release CO 2 during photosynthesis. D.Absorb glucose and release radiant energy

Answer: B. Capture or trap radiant energy and convert it to chemical energy

Plants’ roots grow downwards, not up. This is an example of – A.an organism responding to an internal stimulus. B.an organism responding to an external stimulus. C. a signal being detected. D. a signal being interpreted.

B. an organism responding to an external stimulus - Gravity Answer:

INORGANIC COMPOUNDS ORGANIC COMPOUNDS NaCl H 2 O CO 2 NO 3 C 6 H 12 O 6 _________ CHO 4 C 2 H 4 O 2 Which molecule listed below will complete the Organic compounds chart? 1.Fe2O3 2.CaCl 3.NaSO2 4.CH4

Answer: CH 4 (methane) Carbon and Hydrogen Bonded together

Name the basic elements found in every Organic compounds.. ________________ and ________________

CARBON AND HYDROGEN ANSWER:

All organisms in a pond pass on chemical energy from one level to the next. Using arrows, correctly arrange the organisms listed below according to their correct level in a food chain starting from the sun.. Small fish. Algae. Eagle. Large fish. Sun

ANSWER: SUN  ALGAE  SMALL FISH  LARGE FISH  EAGLE

WHICH ENERGY TRANSFORMATION OCCURS DURING PHOTOSYNTHESIS? A.Mechanical to Chemical B.Chemical to Radiant C.Radiant to Mechanical D.Radiant to Chemical

ANSWER: D. RADIANT TO CHEMICAL

JOHN USES A FORCE OF 10 N TO LIFT A BOX A DISTANCE OF 1 METER UP THE TRUCK. DAVID USES A FORCE OF 5 N TO PUSH THE SAME MASS OF BOX A DISTANCE OF 2 METER UP THE TRUCK. WHICH OF THEM DID MORE WORK LOADING IDENTICAL BOX ONTO THE TRUCK? Use grids to show both answers.

ANSWER: W= FXD BOTH OF THEM DID THE SAME WORK AS SHOWN IN THE CALCULATION. JOHN DID 10 N X 1 M = 10 JOULES OF WORK DAVID DID 5 N X 2 M = 10 JOULES OF WORK CONCLUSION: WORK REMAINS THE SAME FOR THEY ARE BOTH WORKING ON IDENTICAL BOXES WITH THE SAME AMOUNT OF MASS.

PHYSICAL OF CHEMICAL DIGESTION? 1. Which type of digestion occurs when the teeth and saliva break and soften the food. Physical Digestion or Chemical Digestion? Justify your answer.

ANSWER: Physical or Mechanical Digestion because Only the force of the teeth and the softening Of the food due to saliva are involved. There was no evidence of chemical reaction.

2. If the enzymes in the saliva in your mouth, stomach, and small intestines are involve in the breaking of food, how do you call the type of digestion. Physical Digestion or Chemical Digestion? Justify your answer.

Answer: Chemical Digestion because ENZYMES are chemical substance that are capable of breaking the chemical make up of food. The large molecules of food will be broken down into simpler substances to release the nutrients from food.

Using a ramp or inclined plane versus not using It, will make you apply – A. no work on the box B.lesser force on the box C.more force on the box D.A and C

Answer: B. apply lesser force on the box and work remains the same.

The plant inside the box bent around the blocks because it is responding to an external stimulus- A.Gravity B.Water C.Light D.A and B

Answer: C. Light

The plants above are bending towards the Light. This tropism is known as- F. Gravitropism G. Thigmotropism H. Phototropism I. Geotropism

Answer: H. Phototropism

What concept is Illustrated in the Diagram? A.Interaction between organisms B.Photosynthesis C.Cycling of matter D.A and B

Answer: C. Cycling of Matter

Which of these best describes the role of decomposers in the cycling of matter in an environment and on earth? Decomposers- A.Take in carbon dioxide B.Break down molecules of dead organisms C.Trap radiant energy from the sun D.Produce glucose and oxygen

Answer: B. Break down molecules of dead organisms