Plant, Animal & Other Cell Types — Practice · Grade 7 Science

Chapter: Cells, Transport & Cellular Energy

What this practice covers

By the end of Plant, Animal & Other Cell Types you should be able to:

8 questions, written answer and multiple choice, each with a worked explanation.

Vocabulary used: cell wall, chloroplast, vacuole, turgor, specialized cell.

Problem 1

What shared energy process occurs in both plant and animal cells?
Answer and explanation

Both can carry out cellular respiration; plant photosynthesis does not replace it.

Problem 2

What provides selective exchange in a plant cell?
Answer and explanation

The membrane, not simply the rigid cell wall. The wall contributes support and protection.

Problem 3

Does absence of chloroplasts prove a root cell is an animal cell?
Answer and explanation

No. Many plant cells are not photosynthetic; other structures and tissue context help identify them.

Problem 4

Why can a wall alone not identify a plant?
Answer and explanation

Other organisms, including many fungi and bacteria, also have walls. Additional features and context are needed.

Problem 5

Illustrative records: A has wall, enclosed nucleus, and chloroplasts; B has wall and DNA without an enclosed nucleus; C has membrane and enclosed nucleus without a wall. Identify categories supported by the combination of features and qualify the conclusions.
Answer and explanation

A fits the supplied photosynthetic plant model; B fits a prokaryotic cell; C fits a typical animal model. These are supported model comparisons, not a complete identification of species. Other organisms and specialized cells can share selected features, and microscope resolution and sample context matter.

A’s combination fits a photosynthetic plant-cell model.

B’s DNA location fits a prokaryotic model.

C fits a typical animal-cell model but needs sample context.

Response criteria

  • Explain the relevant biological process accurately.
  • Use the supplied evidence and show calculation steps with units where needed.
  • Connect a labeled model or mechanism with the claim.
  • State an assumption, evidence limitation, or useful next observation.

Problem 6

A bulb cell has a wall and nucleus but no visible chloroplasts. Must the observation be wrong?
Answer and explanation

No. Many plant tissues lack chloroplasts, and visible detail also depends on the instrument. Use tissue context and additional features.

Response criteria

  • Explain the relevant biological process accurately.
  • Use the supplied evidence and show calculation steps with units where needed.
  • Connect a labeled model or mechanism with the claim.
  • State an assumption, evidence limitation, or useful next observation.

Problem 7

Which statement is accurate?
  1. Every root cell photosynthesizes
  2. Plant cells can respire
  3. Fungi are animals because they lack chloroplasts
  4. Walls replace membranes
Answer and explanation

Plant cells can respire

Plant cells release usable energy through respiration; a wall does not replace selective membrane exchange.

Problem 8

Why might a leaf cell and root cell have different visible structures?
Answer and explanation

Their functions differ. Many leaf cells photosynthesize and contain chloroplasts; many root cells obtain and transport materials without photosynthesis.

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