Tag: structure of a leaf

A. Spongy tissue – parenchyma with less number of chloroplast.

B. Palisade tissue – parenchyma with more number of chloroplast.

C. Guard tissue – modified epidermal cells with chloroplast, present in the stomata.

D. Bundle sheath – Thick walled parenchymatous sheath present around the vascular bundles in leaves.

So, the correct option is ‘Palisade tissue’.

The foliage leaf consists of three parts, namely leaf base, petiole and lamina. The leaf base is also called as hypopodium. The petiole part of the leaf is also called as mesopodium. The lamina part of the leaf is called as epipodium.

Winged petiole is the petiole in which there is a thin flange of tissue along the length of the petiole. It is a green flattened petiole. Plants like Citrus and Dionaea possess winged petiole. Thus, the correct answer is 'Citrus.'

The largest leaf belongs to Victoria regia in plant kingdom. The approximate diameter of Victoria leaf is 1.3 meter. It is an aquatic plant. It has a floating leaves. 

In grasses and many monocots, the leaf base (petiole) is broad and surrounds the stem as an envelope. Such a leaf base is known as sheathing leaf base. In grasses such as wheat, maize and grass, the sheathing leaf base protects the intercalary meristem. Hence, the plants belonging to family Poaceae have sheathing leaf base.

• Minerals crystals are found in plant cell walls in the form of calcium oxalate, carbonate or silica.
  
• Silicon is found on the leaf surface in the form of spines and other sharp bodies which are known as phytoliths.
  
• It makes the grasses abrasive and foliage indigestible to organisms feeding on them (herbivores).
• Silica incrustation is the deposition of silicon on the leaf surface, it is a defence mechanism found in closely related species of grasses which makes its leaves abrasive.
• So, the correct answer is 'Grasses'.

• Plastochron is the time interval between the two successive events during the growth of plants.
  
• As in the case, when the shoot tip of a plant grows new leaves are produced at regular time intervals.
• This time interval between the beginning of leaf growth at 2 consecutive nodes in a growing shoot apex by keeping the temperature constant is called Plastochron.
• So, the correct answer is 'Period between two successive leaf primordia'

Veins have vascular tissues xylem and phloem. Xylem fulfills the requirement of water of the leaves. Phloem transport food energy to the leaves. They also provide support for the leaf.

• Minerals crystals are found in plant cell walls in the form of calcium oxalate, carbonate or silica.
  
• Cystoliths refers to the deposition of calcium carbonate in the epidermal cells of leaves of the plants belonging to the genus Acanthaceae and Urticaceae (stinging nettles).
• So, the correct answer is 'Cystoliths'.