Unit 2 Chapter 4 Review

A life cycle is the set of changes an organism goes through in its life. Look at the image of a butterfly’s life cycle above. In which stage does the butterfly reproduce?

• When the caterpillar grows inside the egg

• 1. When the caterpillar changes into a chrysalis

• When the butterfly feeds on green leaves to grow

• When the butterfly lays eggs so new caterpillars will hatch

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1. There is a kind of flower that is only found on one hill in the world. A building company buys the hill and destroys all of the flowers except one.

What do you predict will happen?

• The flower will die soon because it cannot reproduce.

• The flower will make new seeds soon. Those seeds will grow into new flowers.

• 1. The flower will reproduce slowly. After many years, the hill will have flowers again.

• 1. The flower cannot reproduce by itself. The species will be gone forever when the flower dies.

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1. A scientist is interested in learning how chimpanzees live in a group. She has noticed that they look for food together. They teach each other how to use sticks as tools. She has noticed that chimpanzee mothers are very important to the group. They stay with their young and teach them how to be chimpanzees.

   How does living in groups help chimpanzees survive?

   
   

• Chimpanzees work together to meet their needs.

• It is easier for chimpanzees to find sticks when they are in groups.

• 1. Chimpanzee mothers can leave their young when they go to find food.

• 1. It is easier for scientists to study chimpanzees when they are in groups.

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1. Zebras live in large herds. When they are all together, their stripes are confusing. This makes it difficult to see where each zebra is.  How could living in a herd help a zebra to survive?

• 1. Predators are afraid of big herds of zebras. They will not attack them.

• Zebras make huffing sounds to communicate with other zebras in the herd.

• Predators will not know where to attack because of the zebra’s stripes.

• Predators like to attack big herds of zebras. They do not attack zebras who are

1. Arianna’s family got a new puppy. Arianna wants to tell her friends about the puppy. She makes a list to describe it.

   Some things on Arianna’s list are physical traits. Physical traits are details about the body that young inherit from their parents.

Which traits did the puppy inherit from its parents?

• four legs and white fur

• four legs and sits on command

• white fur and wears a blue collar

• sits on command and can fetch a ball

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1. Jamal’s cat had three kittens. Each kitten has four legs, two eyes, a tail, and whiskers. One of the kittens likes to sleep all day. The other kittens play a lot. Also, each kitten has different patterns and colors of fur.

       Which answer best explains why these kittens have different patterns and colors of fur?

• 1. The kittens eat different food.

• 1. The kittens have different mothers.

• 1. The kittens got different traits from their parents.

• 1. The kittens got the same traits from their parents, but like to do different things.

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1. Miguel wanted to compare flamingos living at the zoo to flamingos living in the wild. He created a diagram. Based on his diagram, why might the flamingos in the zoo have pale pink feathers instead of bright pink feathers?

   
   

• 1. They eat pellets

• 1. They have long necks

• They have curved beaks

• 1. They eat shrimp and algae

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1. Jeremiah helps his uncle with gardening. They plant two rose bushes. They plant one bush in the yard (Plant 1). They plant the other bush in a pot on the front porch (Plant 2).

After a few weeks, Jeremiah makes a table to compare the plants. Which statement about the rose bushes is true?

• 1. The heights of the bushes depend on where they are planted.

• The color of the bushes’ leaves depend on where they are planted.

• The color of the bushes’ flowers depend on where they are planted.

• 1. The location of the bushes is a trait that comes from the parent plants. 

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1. Unlike birds, mother sea turtles do not stay with their eggs. Mother sea turtles bury their eggs in nests on beaches. Then the mothers return to the ocean. Later, the eggs hatch all at once. Look at the data in the table. Use the data as evidence to draw a conclusion. Which statement is true about the environment and turtle traits?

   
   

• More female turtles hatch from cooler nests.

• Nest temperature does not affect whether turtles hatch as male or female.

• Sea turtle mothers control nest temperature to make their eggs male or female.

• 1. The temperature of the nest determines whether turtle eggs are male or female.

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1. Two calves (young cows) are born to the same parents on a dairy farm. The calves, named Moo and Spot, then move to two different dairy farms.

The table compares the cows after they have moved.

Which relationship is shown in the chart?

• Cows that eat more food make less milk.

• 1. Cows that weigh more produce more milk.

• 1. Cows that live in cooler temperatures make more milk.

• Cows with different parents make different amounts of milk.

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