This hard level worksheet challenges first graders with four multiple choice questions about why a whale is a mammal, what feature all birds share, and what cold blooded means. Part B has five fill in the blank sentences introducing the words vertebrate and invertebrate, explaining that animals with backbones are vertebrates and insects without backbones are invertebrates.
It also reviews which animal groups are warm blooded, stretching science vocabulary further.
Style:
Animal Groups
Part A: Multiple Choice
Circle the letter of the best answer.
1. A whale lives in the ocean. Why is a whale a mammal and not a fish?
A) It is very big
B) It breathes air and feeds its baby milk
C) It swims in the water
D) It has a tail
2. Which feature do ALL birds share?
A) They can all fly
B) They all live in trees
C) They all have feathers
D) They all eat seeds
3. What does it mean when an animal is cold-blooded?
A) It lives in a cold place
B) Its body temperature changes with the environment
C) It does not have blood
D) It is always freezing
4. An animal has a backbone inside its body. What is this animal called?
A) An invertebrate
B) An insect
C) A vertebrate
D) A plant
Part B: Fill in the Blank
Write the missing word on the line.
1. Animals with a backbone are called vertebrates.
2. Insects do not have a backbone, so they are invertebrates.
3. Mammals and birds are warm -blooded animals.
4. Reptiles and fish are cold -blooded animals.
5. A penguin cannot fly, but it is still a bird because it has feathers.
Animal Groups
★ Part A: Multiple Choice
Circle the letter of the best answer.
1. A whale lives in the ocean. Why is a whale a mammal and not a fish?
A) It is very big
B) It breathes air and feeds its baby milk
C) It swims in the water
D) It has a tail
2. Which feature do ALL birds share?
A) They can all fly
B) They all live in trees
C) They all have feathers
D) They all eat seeds
3. What does it mean when an animal is cold-blooded?
A) It lives in a cold place
B) Its body temperature changes with the environment
C) It does not have blood
D) It is always freezing
4. An animal has a backbone inside its body. What is this animal called?
A) An invertebrate
B) An insect
C) A vertebrate
D) A plant
★ Part B: Fill in the Blank
Write the missing word on the line.
1) Animals with a backbone are called vertebrates.
2) Insects do not have a backbone, so they are invertebrates.
3) Mammals and birds are warm -blooded animals.
4) Reptiles and fish are cold -blooded animals.
5) A penguin cannot fly, but it is still a bird because it has feathers.
Ready to Practice?
Choose the best answer for each multiple choice question. Then fill in the missing words.
9 Questions
20-25 minutes
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