Science Quiz for Grade 8

A farmer observes that their tomato plants are not producing as many fruits as usual. He decides to inspect the plants for issues. Which part of the tomato plant is primarily responsible for supporting the weight of the developing fruits?

• Flower

• Leaves

• Roots

• Stems

Which best describes the role of the vascular tissue (xylem and phloem) in a plant?

• To support the plant's structure.

• To trap sunlight for photosynthesis.

• To protect the plant from pathogens.

• To transport water and nutrients throughout the plant.

A branch of celery is soaked in a glass of water containing food dye. Soon, the tough fibers in celery branch are colored. What tissue do the tough fibers contain?

• Xylem

• phloem

• dermal tissue

• ground tissue

Which part of the plant is responsible for absorbing water and minerals from the soil?

• Flower

• Leaves

• Roots

• Stems

What is the term for the process by which plants release water vapor into the air?

• Evaporation

• Photosynthesis

• Respiration

• Transpiration

Which type of vascular tissue transports sugar and amino acids in plants?

• Epidermis

• Mesophyll

• Phloem

• Xylem

How do guard cells regulate the opening and closing of stomata?

• By absorbing water and swelling

• By responding to changes in light intensity

• By secreting hormones that stimulate opening

• By changing shape due to changes in turgor pressure

Which statements accurately describe characteristics of xylem tissue in plants? I. It primarily transports water and dissolved minerals. II. It is composed of living cells, such as sieve tube elements and companion cells. III. Its cell walls are typically lignified, providing structural support. IV. Transport within xylem is predominantly unidirectional, from roots to leaves.

• I and II only

• I and III only

• I, III, and IV only

• I, II, III, and IV

Where are the xylem and phloem typically located within a plant's structure?

• Only in the roots.

• Only in the leaves.

• Scattered throughout the ground tissue.

• Forming a ring within the vascular bundles.

Which are typical observations after placing celery in dyed water for several hours? I. The leaves of the celery stalk show colored veins. II. The color is only visible on the outer layer of the stalk. III. The dyed water travels upward through the stalk. IV. The celery becomes shorter and softer after dye uptake.

• I and II only

• I and III only

• I, III, and IV only

• I, II, III, and IV