Name ____________________________________________ Date __________________________ Period ___________

7th-Grade Life Science Review1) A) Leaf is simple (one leaf on the petiole)..................Go to B

Leaf is compound (multiple leaves on petiole).........Go to C

B) Leaf is lobed......................................................Go to DLeaf is simple and not lobed.................................Go to E

C) Leaves have rounded tips.....................................MimosaLeaves have pointed tips......................................Go to F

D) Lobes are pointed at tips................................Scarlet oakLobes are rounded at tips.................................White oak

E) Leaf veins are pronounced........................American beechLeaf veins are barely visible...........................Black cherry

F) There are 9 smaller leaves on the petiole...Bitternut hickoryThere are 7 smaller leaves on the petiole...........Green ash

Use the dichotomous key to identify the leaf pictured above.

A) White oakB) Scarlet oakC) Black cherryD) American beech

2) Eddie’s assignment is to prepare a dichotomous key for several objects. His first task was to arrange the objects. The objects are a lightning bug, a butterfly, a ladybug, an ant, and a canary. The best arrangement to complete his assignment is

A) in alphabetical order.B) from largest item to smallest item.C) from smallest item to largest item.D) in two groups with similar characteristics

3) The main prey for the frogs in a certain pond are dragonflies. If the number of dragonflies is greatly reduced because of pesticide usage, how could the frogs adapt in order to survive?

A) They could find a new mate.B) They will grow longer tongues.C) They will learn to jump farther.D) They could find a new food source.

4)  Selective breeding happens

A) in one generation.B) in two generations.C) over many generations.D) over thousands of generations.

5)  Which box in the

chart shows an

organ system?

A) P B) Q C) R D) S

6)  All energy in any ecosystem starts asA) carbohydrates.B) electricity.C) sunlight.D) water.

7)  Frogs need water to lay their eggs. It has not rained for many months. The lake is getting smaller. Billy does not see many tadpoles at the lake because

A) the frogs have laid fewer eggs.B) the lake is overcrowded with fish.C) the fish ate all of the frog eggs.D) the frog eggs won't hatch in hot weather.

8)  An animal cell: the human body. Different but also alike. Your brain is the control center of your body. What is the control center of this animal cell?

A) nucleus

B) ribosome C) Golgi body D) mitochondria

9) In sexually reproducing animals, once fertilization of the egg takes place, the ___________ exists as a single cell until cell division begins.

A) egg B) larva C) sperm D) zygote

10)  In this process, the soft tissue of organisms, usually plants, fish, or insects, are preserved when the organism is buried in sediment. Then the hydrogen, oxygen, and nitrogen within the organism's body turn to gases and escape. The remaining element leaves a black film in the rock. This type of fossil is called a

A) cast. B) carbon film. C) trace fossil. D) petrification.

11)  Bill is a fisherman on the Gulf Coast, and he has noticed that over the past several years, the shrimp population has grown smaller. He wants to come up with a way to keep fishing for shrimp, but at the same time, he doesn't want

the shrimp numbers to drop any further.

How could Bill accomplish this?

A) Keep fishing for shrimp, but at a different location.B) Stop fishing for shrimp to let the population rebound.C) Keep fishing for shrimp, but start fishing for other fish as well.D) Keep fishing for shrimp, but at a rate that lets the shrimp population start to grow again.

12)

 The Venn diagram represents two eukaryote kingdoms. Based on the

characteristics shown, A represents __________ and B represents

__________. A) plants; fungi B) fungi; animals

C) fungi;bacteria D) plants; animals

13) This is a standard table of genetic code. A cell’s proteins are made in response to the genetic code contained in the cell’s DNA. Where is this DNA found?

A) in the ribosomes, which are located in the nucleusB) in the chromosomes, which are located in the nucleusC) in the ribosomes, which are located in the cytoplasmD) in the chromosomes, which are located in the cytoplasm

14) The bee above is inadvertently pollinating this flower. The bee transfers

pollen from the _________ on one blossom to the __________ on this one.

A) stigma; style B) anther; ovary C) anther; stigma D) filament; anther

15) A food chain is a circle. The transfer of energy moves from plant to animals to decomposer and back to plant. What supplies the energy the plants need?

A) animalsB) sunC) waterD) wind

16) Letter drawn by group Mutation if any Result/Trait(s)

A AAGGGCUUAUUC Extra long nails on digits

B GGCUUAUUC No digits on hands; hands paddle-like C AUGGGCUUAUAC Normal D AUGGGCGGCUUAUAC Hands fused in front of body; no range of arm motion E UACAUGGGCUUA Webbing hands and feet F AUGGGCAUAUAC No peripheral vision G AUGGCCUUAUAC Blind H GGGAUAUCG Short legs; correct number of digits on hands and feet

The process of evolution involves changes in the genetic makeup of a population over a period of time. Sexual reproduction enhances variability among offspring. The random alteration of DNA from parent to offspring, called mutations, also produces variable characteristics in offspring. Some mutations can be helpful, while others can be harmful and hinder survival. In this experiment, students mimicked random mutations. The mutations affected eyesight and appendages. Data was collected by the students to determine if the mutations were helpful or harmful when trying to collect and eat food.

Based on the phenotypic results of the mutations, which group or groups would be LEAST LIKELY to survive?A) Groups B and DB) Groups D and GC) Groups F and GD) All groups other than C

17) Four stages of mitotic cell division are shown in the diagram.

 In which stage do the chromatids get separated and move toward opposite ends of the cell?

A) P B) Q C) R D) S

18) Vertebrates that are cold blooded, breath with gills, and spend their entire life in the water would be classified as

A) amphibian B) bird C) fish D) reptile

19) Gene flow is the movement of genes between different populations. Which of these would NOT be a barrier to gene flow?

A) OceansB) Big desertsC) Large mountain rangesD) Natural bridges connecting islands

20) Take a deep breath. Where does that air you breath in go? It goes into your lungs, but that's not the end! Your circulatory system helps to move the oxygen to all of your cells. What carries the oxygen to every cell in your body?

A) blood B) food C) heart D) veins

21) ________ are responsible for recycling matter back into the food web once an organism has died.

A) CarnivoresB) DecomposersC) OmnivoresD) Producers

22) The genetic information contained in the cells resulting from meiosis

A) has no role in determining traits of organismsB) determines the traits of the parent organism that produces the cellsC) determines the traits of offspring resulting from sexual reproductionD) determines the traits of offspring resulting from asexual reproduction

23)  Fungi are both beneficial and destructive. This fungus is living in and on the tree seen here. This is a ____________ relationship and could cause the tree to ______________.

A) helpful; grow B) parasitic; die C) helpful; make fruit D) symbiotic; reproduce

24)  If a cell starts with 48 chromosomes, then each new cell, or gamete, produced at the end of the process will contain ________ chromosomes.

A) 12B) 24C) 48D) 96

25) The finches that Darwin studied in the Galapagos islands have evolved with different types of beaks: drilling, cracking, tearing, and fishing. This is an example of

A) predation.B) adaptive radiation.C) warning coloration.D) protective resemblance.

26)  Drought has multiple effects on entire ecosystems. From increasing risks of forest fire to reducing harvests of crops, drought can affect plants, animals, and people. Which of these best describes how river- dwelling fish could be negatively impacted by a drought?

A) People go fishing more often when water levels are low, which

increases the risk for fish of being caught.

B) They would be forced to relocate to oceans, and would not survivevery long surrounded by unfamiliar predators.

C) As water levels decrease, rivers heat up more quickly, making water temperatures too high for fish and other wildlife.

D) With less water for migration and spawning, fish would be forced to move to human-populated areas, increasing risk of dying.

27)  In paramecia and bacteria, __________ is a reproductive process that allows recombination of genetic information.

A) conjugation B) fission C) mitosis D) reconstitution

28)  In this aerial picture of the Sahara Desert in Africa, what is a

physical characteristic of the area?

A) high humidity B) distinct seasonal changes C) less than 10 inches of rain per year D) more than 200 inches of rain per year

29) The Culpepper basin in Virginia, as well as some smaller basins near Richmond, have many rocks filled with fish fossils and dinosaur tracks. These rocks are MOST LIKELY

A) igneous.B) intrusive.C) sedimentary.D) metamorphic.

30) Review the chart of all the domesticated rabbits. The different types of rabbits are listed by their scientific names. If you were a rabbit breeder,which rabbits could you breed to produce fertile offspring? Explain.

A) All of the rabbits listed. They are all rabbits.B) None of these rabbits. They are all different species.C) Any of the cottontail rabbits They are the same species.D) Any of the rabbits on the same branch in the chart because that means

they are closely related.

31)  Malaria is a disease caused by a protozoan. This protozoan lives in the salivary glands of certain mosquitoes without causing the mosquito any harm or benefiting the mosquito. When a mosquito bites a human, some of these protozoa may be transferred to the human, causing a malarial infection. What type of interspecies interactions are the malaria protozoans exhibiting?

A) mutualism with both the mosquito and the humanB) parasitism with both the human and the mosquitoC) commensalism with the human and parasitism with the mosquito

D) commensalism with the mosquito and parasitism with the human

32) It is estimated that fifty million people world-wide have this type of dysentery. It is contracted from contaminated water, and from fruits and vegetables grown in areas where human wastes are used as fertilizer. The protist enters through the mouth and eventually invades the walls of the intestines, causing ulcers and inflammation.

 This disease is caused by a protist, specifically a(n)A) algae.B) amoeba.C) euglena.D) paramecium.

33)  Several teeth were found in an area of flat land covered with trees and plants. The teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. They found many other shark teeth in this area. However, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. What is the paleontologist's BEST explanation for why the teeth were found in this area?

A) Sharks used to live on flat land.

B) This area was once covered with salt water. C) This area was once covered with freshwater. D) Someone buried the shark teeth deep in the ground.

34) During the Late Carboniferous, Indiana lay close to the equator, making the climate humid and warm. Swamps and wetlands were prominent in much of the state. Dominant fossil plants from this time include lycopods, conifers, and seed ferns (extinct gymnosperms).

 Plant material accumulated in these areas of Indiana and eventually became the source of Indiana’s abundant

A) coal deposits. B) granite outcrops. C) limestone deposits. D) layers of sandstone.

35) These four finch species lived together on an island. Each species ate something different: large seeds, small seeds, insects, and leaves. As more people moved to the island and built houses, the available finch food changed. There were fewer seeds of any kind for the finches to eat. We would expect, over time,

A) that the seed eating species would disappear.B) there would be little change in the finch species.C) that the seed eating birds would eat something else.D) all the finch species would gradually become extinct.

36)  Which kingdom of organisms is usually multi-celled, heterotrophic, and has cell walls made of chitin, divided by openings called septa?

A) algaeB) animalsC) fungi

D) plants

37)  How does the speckled coat of a young deer help it to survive?A) The speckled coat is a form of mimicry.B) This is a physical adaptation that helps a doe recognize her fawn.C) The pattern of the speckled coat is used as a form of warning coloration.D) The speckled coat blends with the light that filters through the forest leaves.

38)  Assume sexual reproduction occurs. What is the number of chromosomes in the zygote if the parent's reproductive cells or gametes contain 12 chromosomes each?

A) 6 B) 12 C) 24 D) 48

39)  Amniocentesis is a process in which amniotic fluid is taken from the mother's womb to identify any genetic abnormalities in the fetus. How would the discovery of the human genome contribute to this process?

A) The defective gene can be replaced with its normal counterpart.B) The exact location of a particular disease-causing gene can be determined.C) Scientists will be able to detect new genes, causing other genetic disorders.D) Scientists can block the action of defective genes and arrest any genetic abnormalities.

40) An energy pyramid is a graphical model of energy flow in a community. The different levels represent different groups of organisms that compose a food chain. An energy pyramid’s shape shows how the amount of usefulenergy that enters each level. Chemical energy, in the form of food, decreases because some is used by the organisms in each level. The source of the chemical energy is the producers, that rearrange carbon dioxide and water in the presence oflight to make ________ through the process of ______________.

A) oxygen; respirationB) sugars; respirationC) sugars; photosynthesisD) energy; photosynthesis

41) The central vacuole in a plant cell is responsible for turgor pressure. When the vacuole loses water the cytoplasm "shrinks". When the vacuole gains water the cytoplasm seems to "puff up". One structure helpsthe plant cell keep its shape no matter how muchwater is in the vacuole. This is the

A) cell wall.B) cytoplasm.C) cytoskeleton.D) cell membrane.

42) Which body system is responsible for our movement, energy, and for moving food from one organ to another?

A) digestive B) muscular C) nervous D) skeletal

43)Human hearts have pairs of two types of chambers; the atria (plural for atrium)and the ventricles. Atria are where blood enters the heart and ventricles pump the blood out of the heart. The heart also takes in oxygen poor blood, pumps it through the lungs or gills (fish), where the blood is oxygenated, and then pumped through the rest of the body. Identify which statement is correct.

A) Fish have a three-chamber heart. B) Reptiles have a two-chamber heart. C) Mammals have a four-chamber heart. D) None of these statements are correct.

44)  A cell with chloroplasts and a cell wall made of cellulose would likely belong to a(n)A) frog from Kingdom Animalia.B) mushroom from Kingdom Fungi.C) oak tree from Kingdom Plantae.D) paramecium from Kingdom Protista.

45)  Predict the next digestive system organ in the following sequence:mouth, pharynx, esophagus, stomach, _______

A) liverB) kidneysC) small intestineD) large intestine

46)  According to the law of conservation of matter, in any food chain we know thatA) the quantity of matter in producers and consumers is always equal.B) matter is created at the start of a food web and destroyed in the end.C) matter is changed into various forms but the total quantity remains unchanged.D) the amount of matter increases as the food web progresses from the producers to the consumers.

47)  Reptiles and birds are divided into two classes, reptilia and aves. What fossil evidence would be the BEST support for this division?

A) amniotic eggs of birdsB) presence of reptilian scalesC) air chambers in the bird skeletonsD) warm-bloodedness of birds versus cold-bloodedness of reptiles

48)  With their lack of gills, dolphin must surface every 10-15 minutes to breathe using a structure called a blowhole located on the top of its head. Young dolphins, when born, also have a small amount of hair on their lips which falls off shortly after birth. Which would be the best classification group for a dolphin?

A) amphibian

B) fish C) mammal

D) reptile

49) Nephridia, the excretory organs in earthworms, are equivalent to the ____________ in humans and frogs.

A) kidneysB) lungsC) ovariesD) testes

50) True or False. Diffusion is the movement of a fluid from an area of higher concentration to an area of lower concentration.

A) True B) False