#stomata

BOTANY

Which of the following statements about stomata is correct?

Each stoma is surrounded by two guard lls, which regulate its opening and closing. The outer walls are thin, and the inner walls are thick. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

View Details

Respiratory Quotient and Factors Affecting Respiration

Which structure in plant cells facilitates gas exchange for respiration?

Stomata in leaves and lenticels in stems facilitate gaseous exchange for respiration in plants.

Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Respiratory Quotient and Factors Affecting Respiration

View Details

Electron Transport System and Oxidative Phosphorylation

Which structure in plants facilitates oxygen intake and carbon dioxide release?

Lenticels are small openings in woody stems that facilitate gas exchange in plants.

Ref: NCERT Class 11 Biology Chapter 12: Respiration in Plants Electron Transport System and Oxidative Phosphorylation

View Details

Photosynthesis - Significance and Bacterial Photosynthesis

Why do CAM plants keep their stomata closed during the day?

CAM plants keep their stomata closed during the day to minimize water loss through transpiration in arid environments.

Ref: NCERT Class 11 Biology Chapter 11: Photosynthesis in Higher Plants Photosynthesis - Significance and Bacterial Photosynthesis

View Details

Photosynthesis - Early Experiments and Pigments

Which factor affects the opening and closing of stomata, influencing photosynthesis?

Water availability affects stomatal opening, which in turn regulates gas exchange for photosynthesis.

Ref: NCERT Class 11 Biology Chapter 11: Photosynthesis in Higher Plants Photosynthesis - Early Experiments and Pigments

View Details

Anatomy of Dorsiventral and Isobilateral Leaf

Which of the following cells in the epidermis help in the regulation of stomatal movement?

Guard cells surround the stomatal pore and regulate its opening and closing.

Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Anatomy of Dorsiventral and Isobilateral Leaf

View Details

Anatomy of Dorsiventral and Isobilateral Leaf

Which of the following statements about stomata is correct?

Each stoma is surrounded by two guard cells, which regulate its opening and closing. The outer walls are thin, and the inner walls are thick.

Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Anatomy of Dorsiventral and Isobilateral Leaf

View Details

Anatomy of Dorsiventral and Isobilateral Leaf

Which of the following statements about stomatal apparatus is correct?

Stomata are surrounded by specialized guard cells, which regulate the opening and closing of the stomatal pore.

Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Anatomy of Dorsiventral and Isobilateral Leaf

View Details

Tissue System - Epidermal Ground and Vascular

What is the function of guard cells in stomata?

Guard cells regulate the opening and closing of stomatal pores to control transpiration and gas exchange.

Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Tissue System - Epidermal Ground and Vascular

View Details

Tissue System - Epidermal Ground and Vascular

Which tissue system includes the epidermis, stomata, and trichomes?

The epidermal tissue system consists of the epidermis, stomata, and trichomes, which provide protection and regulate gas exchange.

Ref: NCERT Class 11 Biology Chapter 6: Anatomy of Flowering Plants Tissue System - Epidermal Ground and Vascular

View Details

Morphology of Flowering Plants

Which part of the leaf helps in gaseous exchange and transpiration?

Stomata are small openings on the leaf surface that regulate gaseous exchange and transpiration.

Ref: NCERT Class 11 Biology chapter - Morphology of flowering plants

View Details

Plant Classification

Stomata are absent in

During early land plant evolution, stomata composed of paired guard cells controlling gas exchange and transpiration appeared first in sporophytes of hornworts and mosses and evolved further in vascular plants with complex patterning. Liverworts uniquely among extant embryophytes completely lack true stomata on either gametophyte or sporophyte generation. They do possess simple air pores surrounded by ring of cells that cannot actively open and close, reflecting alternative ventilation strategy for photosynthetic thallus with internal air chambers. Presence of functional stomata correlates with need for regulated transpiration and homoiohydry.

Ref: Proctor 2000 Liverwort pores; Edwards 1993 Stomata evolution; Vanderpoorten Bryophytes

View Details