MAP Grade 7

Bees pollinate (授粉) flowers from the same species of plants. The bees obtain food, and then the plants can reproduce. Which of the following best describes this situation?

• Competition

• Predation

• Parasitism

• Mutualism

What advantage does white fur (毛皮) give animals which live in northern Canada?

• A. The white fur helps the animal move faster.

• B. The white fur protects the animal from rain.

• C. The white fur absorbs more heat than black fur.

• D. The white fur allows the animal to blend in with the snow.

Which is the primary source of energy for Earth's climate system?

• Moon

• Sun

• Plants

• Animals

Which of the following returns carbon, nitrogen, phosphorus and other nutrients to the soil? 让营养回归土壤的是？

• producers

• carnivores

• herbivores

• decomposers

Which of the following requires a steady diet of animal to survive? 谁总需要吃动物才能生存？

• producers

• carnivores

• herbivores

• decomposers

One of the sea otters(海獭)' main foods is sea urchins(海胆). Which of the following is true?

• As the population of sea otters increases in an area, the population of sea urchins also increases.

• As the population of sea otters increases in an

  area, the population of sea urchins decreases.

• The population of the sea urchins in an area is not changed by the population of sea otters in the same area.

• The population of sea otters will increase when there is a very low population of sea urchins in the area.

Which of the following does not have a fixed volume nor a fixed shape? 以下哪个东西没有固定的体积或者形状？

• Helium in a balloon.

• Ice cubes in a cup.

• Water in a swimming pool.

• Rocks in a bucket.

A dry desert has a rainy season for a few weeks. Which of the following would you expect?

• Plant populations decrease

• Insect populations decrease

• Insect populations increase

• Birds migrate away

Which explains the higher variety and abundance of life in a jungle (热带丛林), when compared to an arctic tundra (北极冻土带)?

• The jungle has lower temperatures and more water.

• The jungle has higher temperatures and more nutrients available.

• The arctic tundra has a higher supply of fresh water.

• The arctic tundra has higher temperatures and more nutrients.

Which organelle allows plants to absorb sunlight and make sugars?

• Chloroplast 叶绿体

• Nucleus 细胞核

• Mitochondria 线粒体

• Cell Wall 细胞壁