Plant Tissues - Class 9 Science Free MCQ Test with solutions

Tracheids and vessels in xylem are tubular structures that primarily transport water and minerals vertically throughout the plant. Option A correctly identifies their function.

Aerenchyma is a specialized type of parenchyma tissue that contains large air cavities, which help aquatic plants float. Therefore, Option B is the answer.

Chlorenchyma, a type of parenchyma that contains chlorophyll, is primarily responsible for photosynthesis. Therefore, Option C is the correct answer.

The epidermis serves as a protective layer, shielding internal tissues from water loss, mechanical injury, and pathogens. Thus, Option D is correct.

In older plants, cork forms a protective layer that is impervious to gases and water, effectively serving as an external protective tissue. Option C is correct.

Sieve tubes, part of the phloem tissue, are responsible for transporting food materials from leaves to other parts of the plant. Therefore, Option B is the correct answer.

Epidermal cells in the roots often bear long hair-like structures that increase the total absorptive surface area for water and nutrients. Option B is correct.

Companion cells in phloem assist sieve tubes in the transport of food throughout the plant. Option B accurately describes their role.

The thick waxy coating on the epidermis of desert plants is to reduce water loss, crucial for survival in arid conditions. Thus, Option C is the correct answer.

Xylem fibers mainly provide structural support within the plant, helping it maintain rigidity and strength. Therefore, Option C is correct.

Guard cells regulate the opening and closing of stomata, controlling gas exchange and water evaporation, which are vital for plant survival. Option C accurately identifies their critical function.