SCIENCE 7 REVIEWER

QUESTION 11. What is the smallest level of biological organization discussed in the lesson?

Choose one answer

A. Tissue B. Organ C. Cell D. Organism

QUESTION 22. Why is a tissue considered a higher level of organization than a cell?

Choose one answer

A. A tissue contains several ecosystems. B. A tissue is made of similar cells working together C. A tissue is made of several organ systems. D. A tissue contains both living and non-living things.

QUESTION 33. Which sequence correctly shows the levels of biological organization from smaller to larger?

Choose one answer

A. Cell → Tissue → Organ → Organ System → Organism B. Cell → Organ → Tissue → Organism → Organ System C. Tissue → Cell → Organ → Organism → Organ System D. Organ → Tissue → Cell → Organ System → Organism

QUESTION 44. A pond contains tilapia, aquatic plants, insects, water, soil, and sunlight. Which level of biological organization does the entire pond represent?

Choose one answer

A. Population B. Community C. Organism D. Ecosystem

QUESTION 55. Consider the following observations in a pond:
• One tilapia is observed.
• Many tilapia of the same species live in the pond.
• Tilapia, plants, insects, and other living organisms interact there.
Which sequence correctly identifies these levels?

Choose one answer

A. Population → Organism → Ecosystem B. Organism → Population → Community C. Organism → Community → Population D. Community → Population → Organism

QUESTION 66. A group of muscle cells forms muscle tissue. Several tissues form the heart, and the heart works with blood vessels in the circulatory system. What does this example demonstrate?

Choose one answer

A. Higher levels of organization are independent of lower levels. B. Cells are more complex than organ systems. C. Each level is built from and connected to lower levels of organization. D. An organism can function even if its organs do not work together.

QUESTION 77. A student draws the following diagram:
Cell → Tissue → Organ → Organ System → Organism → Community → Population → Ecosystem → Biosphere
How should the diagram be evaluated?

Choose one answer

A. It is completely correct. B. Population and community should both come before organism. C. Ecosystem should come before population. D. Population and community are in the wrong order.

QUESTION 88. Which diagram best represents the complete hierarchy of biological organization from smallest to largest?

Choose one answer

A. Cell → Tissue → Organ → Organ System → Organism → Population → Community → Ecosystem → Biosphere B. Cell → Organ → Tissue → Organ System → Population → Organism → Ecosystem → Community → Biosphere C. Biosphere → Ecosystem → Community → Population → Organism → Organ System → Organ → Tissue → Cell D. Cell → Tissue → Population → Organ → Community → Organism → Ecosystem → Organ System → Biosphere

QUESTION 99. Which group occupies the first trophic level of a food pyramid?

Choose one answer

A. Producers B. Primary consumers C. Secondary consumers D. Tertiary consumers

QUESTION 1010. Why does the amount of available energy decrease as organisms are placed higher in a food pyramid?

Choose one answer

A. Higher organisms do not need energy. B. Plants prevent energy from moving upward. C. Organisms use much of the energy for life processes, and some is lost as heat. D. Energy increases only when organisms reproduce.

QUESTION 1111. Consider the food chain:
Palay → Grasshopper → Frog → Snake
At which trophic level is the grasshopper?

Choose one answer

A. First trophic level – Producer B. Second trophic level – Primary Consumer C. Third trophic level – Secondary Consumer D. Fourth trophic level – Tertiary Consumer

QUESTION 1212. In the same food chain,
Palay → Grasshopper → Frog → Snake
how should the frog be classified?

Choose one answer

A. Producer B. Primary consumer C. Tertiary consumer D. Secondary consumer

QUESTION 1313. A rice field contains many palay plants, fewer grasshoppers, still fewer frogs, and only a few snakes. Which explanation best accounts for this pattern?

Choose one answer

A. Less energy is available to support organisms at higher trophic levels. B. Snakes cannot live in rice fields. C. Plants receive less energy than animals. D. Every trophic level receives exactly the same amount of energy.

QUESTION 1414. Two food pyramids are compared.
Pyramid X: The producer level is widest, while the tertiary consumer level is narrowest.
Pyramid Y: All trophic levels are drawn with equal widths.
Which pyramid better represents energy availability?

Choose one answer

A. Pyramid Y, because all organisms need equal energy. B. Pyramid Y, because energy increases toward the top. C. Pyramid X, because available energy becomes lower at higher trophic levels. D. Pyramid X, because tertiary consumers produce their own food.

QUESTION 1515. A student places a snake at the bottom of an energy pyramid and rice plants at the top. How should this model be evaluated?

Choose one answer

A. It is correct because snakes have the most energy. B. It is incorrect because producers such as rice plants should form the base. C. It is correct because plants depend on animals for energy. D. It is incorrect only because the snake should be in the second level.

QUESTION 1616. Which food pyramid is scientifically most appropriate for the organisms in a rice field?

Choose one answer

A. Snake → Frog → Grasshopper → Palay B. Frog → Palay → Snake → Grasshopper C. Grasshopper → Snake → Palay → Frog D. Palay → Grasshopper → Frog → Snake

QUESTION 1717. According to the 10% rule, approximately how much energy from one trophic level is transferred to the next higher level?

Choose one answer

A. 1% B. 10% C. 50% D. 100%

QUESTION 1818. If palay plants contain 5,000 units of energy, approximately how much energy will be available to the primary consumers that eat them?

Choose one answer

A. 50 units B. 250 units C. 500 units D. 5,000 units

QUESTION 1919. An energy pyramid contains 10,000 kcal at the producer level. Based on the 10% rule, approximately how much energy would be available to a secondary consumer?

Choose one answer

A. 100 kcal B. 1,000 kcal C. 5,000 kcal D. 10,000 kcal

QUESTION 2020. Consider the food chain:
Palay → Grasshopper → Frog → Snake
If the palay contains 1,000 units of energy, which set correctly estimates the energy available at the succeeding levels?

Choose one answer

A. Grasshopper = 900, Frog = 800, Snake = 700 B. Grasshopper = 500, Frog = 250, Snake = 125 C. Grasshopper = 10, Frog = 100, Snake = 1,000 D. Grasshopper = 100, Frog = 10, Snake = 1

QUESTION 2121. A primary consumer receives approximately 300 units of energy. Based on the 10% rule, approximately how much energy was available at the producer level?

Choose one answer

A. 30 units B. 300 units C. 3,000 units D. 30,000 units

QUESTION 2222. A farmer uses a pesticide that kills most of the grasshoppers in this food chain:
Rice Plant → Grasshopper → Frog → Snake
What is the most likely effect on energy transfer?

Choose one answer

A. More energy will immediately reach the frogs. B. Energy transfer to frogs and snakes may decrease because an important link has been reduced. C. Snakes will begin producing their own food. D. The rice plants will become tertiary consumers.

QUESTION 2323. Why are there usually many producers but relatively few top predators in an ecosystem?

Choose one answer

A. Producers require more space than all animals combined. B. Top predators do not need food very often. C. Only a small portion of energy is passed to each higher trophic level, so less energy is available to support top predators. D. Energy becomes greater every time one organism eats another.

QUESTION 2424. A student makes an energy pyramid showing the following:
• Producer = 1,000 units
• Primary Consumer = 1,000 units
• Secondary Consumer = 1,000 units
• Tertiary Consumer = 1,000 units
What is the main problem with the model?

Choose one answer

A. It incorrectly shows equal energy at every trophic level. B. Producers should have the least energy. C. Tertiary consumers should have more energy than producers. D. Food pyramids cannot contain numerical values.

QUESTION 2525. A community wants to protect frogs, snakes, and other animals in a rice-field ecosystem. Which action is best supported by the concept of energy transfer in food pyramids?

Choose one answer

A. Remove most producers so predators have more space. B. Eliminate all insects because they compete with larger animals. C. Protect producers and maintain organisms at lower trophic levels because they supply energy that supports organisms above them. D. Protect only top predators because lower trophic levels are not important.