Special tissues - class-XI

The specialized tissue includes nectaries. Floral nectaries are generally located at the base of the perianth, so pollinators are made to brush the flower's reproductive structures, the anthers and pistil, while accessing the nectar. Nectar is a sugar-rich liquid produced by plants in glands called as nectaries, either within the flowers with which it attracts pollinating animals or by extrafloral nectaries, which provide a nutrient source to animal mutualists, which in turn provide antiherbivore protection. 
Thus, the correct answer is option C.

The entire surface of the plant consists of a single layer of cells called as epidermis or surface tissue. The entire surface of the plant has this outer layer of epidermis. Hence, it is also called as surface tissue. Most of the epidermal cells are relatively flat. The outer and lateral walls of the cell are often thicker than the inner walls. The cells forms a continuous sheet without intercellular spaces. It protects all parts of the plant. 

A xerophyte is a species of plant that has adapted to survive in an environment with little water, such as a desert or an ice or snow covered region in the Alps or the Arctic. The morphology and physiology of xerophytes are variously adapted to conserve water, and commonly also to store large quantities of water, during dry periods. Other species may be adapted to survive long periods of desiccation of their tissues, during which their metabolic activity may effectively shut down. So, thick cuticle, well developed mechanical tissue and vascular tissue are the adaptations for xerophytes. The spongy mesophyll's function is to allow for the interchange of gases (CO$ _2$) that are needed for photosynthesis.The spongy mesophyll cells are less likely to go through photosynthesis than those in the palisade mesophyll which are not required for xerophytes. 

Cotton is a soft, fluffy staple fibre that grows in a boll or protective capsule, around the seeds of cotton plants of the genus Gossypium in the family of Malvaceae. The fibre is almost pure cellulose. Under natural conditions, the cotton bolls will tend to increase the dispersion of the seeds. Cotton is a seed hair fibre produced from epidermal seed coat. Flax fibres are taken from the stem of the plant and are two to three times as strong as those of cotton. Sunn hemp is a bast fibre. Manila hemp fibres are obtained from leaf and stems. 
Thus, the correct answer is option B.

Complex tissues are those that are formed of more than one type of cells. Xylem is made up of tracheids, tracheae, xylem parenchyma and xylem fibers. Phloem is composed of sieve elements, companion cells, phloem parenchyma and phloem fibers. Hence xylem and phloem are called complex tissues. Thus the correct answer is option C.

Procambium is a primary meristematic tissue that differentiates into primary vascular tissues, specifically the primary xylem and primary phloem. It is distinct from the vascular cambium, which is a secondary meristem.

1. Vascular tissue system includes xylem and phloem and helps in food and water conduction.
2. Ground tissue system mainly consists of simple tissues such as parenchyma, collenchyma, and sclerenchyma. Parenchyma is usually present in cortex, pericycle, pith and medullary ray.
3. Epidermal tissue system forms the outer -most covering of the complete plant body. Stomata are present here.
4. Meristematic tissue contributes to the primary growth of the plant and includes apical and intercalary meristems.

Plasmodesmata are the cytoplasmic thread that connects the cell wall of the two neighbouring cells which helps in intercellular transport or exchange of materials.
Thus, the correct answer is option D.

The textile fibers are grouped as surface, soft and hard fibers.  

Parenchymatous tissues are readily used for storage of various cells like food, air and chlorophyll. An idioblast is atype of parenchyma tissue which mainly  performs various functions such as storage of reserves, excretory materials, pigments, and minerals. They contain oil, latex, gum, resin, tannin or pigments, poisonous calcium oxalate or carbonate or silica. Idioblasts are divided into three main categories: excretory, tracheoid, and sclerenchymatous.

Lacticiferous vessels are found in plants that produce latex. Laticifers are connected longitudinally to form long chains of coenocytic cells. Laticifers or lacteal ducts are located in the cortex and are specialized type of parenchymatous cells.
So, the correct answer is 'Cortex'

Vascular tissue is also called as complex tissue. It is heterogeneous in nature with different types of cells. The chief elements are xylem, phloem and pericycle. 
Thus, the correct answer is option C.

In a stele, if phloem is both external and internal to xylem, it is called as bicollateral, as found in leaves mostly and in a few stems. This can be seen in Solanaceae and Cucurbitaceae family.

Leptome is actually a phloem. The term was given by Haberlandt. It is responsible for conduction of organic substances.
Thus, the correct answer is option B.

Hydathodes are structures on leaf tips for guttation (a-3). Collenchyma is a living mechanical tissue with pectin-rich walls (b-2). Periblem is the meristematic layer that develops into the cortex (c-4). Tyloses are balloon-like outgrowths from xylem parenchyma into vessels (d-1).