EVERYDAY SCIENCE

Detailed explanation-1: -(A) Guard cell : This is the correct answer. Cells enclosing the stomatal aperture are bean shaped and are known as guard cells.

Detailed explanation-2: -In plants, gases are exchanged through small openings called stomata which are present mostly on the lower surface of leaves and on green stems. Each stoma has two bean-shaped cells called guard cells.

Detailed explanation-3: -A small bean-shaped structure that is part of the body’s immune system. Lymph glands filter substances that travel through the lymphatic fluid, and they contain lymphocytes (white blood cells) that help the body fight infection and disease. There are hundreds of lymph glands found throughout the body.

Detailed explanation-4: -Guard cells are pairs of epidermal cells that control gas diffusion by regulating the opening and closure of stomatal pores. Guard cells, like other types of plant cells, are surrounded by a three-dimensional, extracellular network of polysaccharide-based wall polymers.

Detailed explanation-5: -Stomata are pores in the plant epidermis that function as gateways linking the intercellular gas spaces to the external environment. Two guard cells surround each stomatal pore, and changes in turgor pressure of the guard cells regulate the size of the pore aperture.