Tag: botany

The large sized, thin-walled, vacuolated, water containing colourless epidermal cells present on the adaxial epidermis of an isobilateral leaf or monocot leaf are called Bulliform cells. They differ from other cells in being size, structure and function.

So, the correct option is ‘large, thin-walled, vacuolated containing water’

In the monocot leaf, mesophyll is undifferentiated, shows spongy parenchyma with oval-shaped cells.

So, the correct option is ‘Mesophyll not differentiated into palisade and spongy tissues'.

A.Isobilateral leaves – Mesophyll is undifferentiated, contains spongy parenchyma only.

B.Dorsiventral mesophytic leaves – Mesophyll is differentiated into upper palisade parenchyma and lower spongy parenchyma.

C.Dorsiventral xerophytic leaves – Mesophyll is differentiated into upper and lower palisade parenchyma and middle spongy parenchyma.

D.Vertical leaves - Mesophyll is differentiated into upper and lower palisade parenchyma and middle spongy parenchyma.

So, the correct option is ‘isobilateral leaves’.

In isobilateral leaves or monocot leaves, stomata are present on both upper or adaxial epidermis as well as lower epidermis or abaxial epidermis.

So, the correct option is ‘Both upper and lower surfaces’.

Dicot leaf differs from monocot leaf anatomically in terms of presence of more number of stomata in the lower epidermis, presence of differentiated mesophyll,  and vascular bundle.

Leaf, in which both surfaces are similar in appearance are called isobilateral leaves. These are found in monocotyledons. It is due to the presence of spongy parenchyma.

So, the correct option is ‘Similarly two green surfaces’.    

• Leaves have a layer of waxy cuticle on their surface as it helps in preventing water loss due to excess transpiration. The leaves may also have hair on the lower surface which act as trichomes and protect the surface of the leaves.
• The epidermis of the leaves has minute pores called stomata through which gaseous exchange takes place.
• Endodermis and Casparian strips are present in the roots of the plants.

Bulliform cells or the motor cells are the modified epidermal cells present on the upper surface or the adaxial surface of the monocot leaf (the grasses). They are colourless, large-sized and vacuolated cells. They regulate the rolling of leaves to prevent the loss of water. When water is adequately present, they become turgid and keep the leaf open and exposed. When there is scarcity of water, the become flaccid and roll-up the leaf to prevent the loss of water.

The tissue is the group of cells from the common origin and performs a specific function and its detailed study is called as histology. Dermatology is the branch of medicine concerned with the diagnosis and treatment of skin disorders. Cardiology is the branch of medicine that deals with diseases and abnormalities of the heart. Cytology is the branches of biology and medicine concerned with the structure and function of plant and animal cells. Thus, the correct answer is option A.

The study of tissue is known as histology or, in connection with disease, histopathology. The tissues are studied by the use of paraffin block in which tissue is embedded and then sectioned, the histological stain and then observed under the microscope. Therefore, the correct answer is option D.