18. What is lignin?
19. Draw a neat diagram of stomata
20. What is transpiration?
21. Epidermis of the desert plant is usually thick. Give reason.
22. Name the complex permanent tissues.
23. Name the different types of cells of Xylem.
24. What is the function of Xylem?
25. Name the different types of cells of Phloem.
26. What is the function of Phloem?
27. Draw a neat labelled diagram of Complex tissues in plants.
28. Describe the cells of epithelial tissues.
29. Where is the Squamous epithelium found?
30. Where is columnar epithelium found?
31. What is glandular epithelium ?
32. Describe the cells of connective tissues.
33. State the function of blood.
34. What is a ligament?
35. What is a tendon?
36 What is a cartilage?
Answers
Answer:
18) a complex organic polymer deposited in the cell walls of many plants, making them rigid and woody.
20) (of a plant or leaf) the exhalation of water vapour through the stomata
21) In desert plants epidermis is present as a thick waxy coating of cuticle because rate if evaporation is high in desert the thick layer prevent the water from evaporating from the plant. Thus, desert plant are able to survive in high temperature.
22) Complex tissues: Phloem and Xylem.
23) Xylem consists of three different types of cells: Xylem parenchyma cells and xylem fiber cells, which simply provide structural support for the most important xylem cells, the tracheary elements (TE). The TE are completely dead at maturity, and act like pipes to allow water and dissolved minterals to flow through them.
24) Xylem is the specialised tissue of vascular plants that transports water and nutrients from the plant–soil interface to stems and leaves, and provides mechanical support and storage. The water‐conducting function of xylem is one of the major distinguishing features of vascular plants.
25) There are 3 different subtypes:
pre (precursor) B cell ALL, this is the most common type in adults.
pre (precursor) T cell ALL, this is more likely to affect young adults and is more common in men.
mature B cell ALL, this type is identified by particular genetic changes.
26) Phloem is the vascular tissue in charge of transport and distribution of the organic nutrients. The phloem is also a pathway to signaling molecules and has a structural function in the plant body.
28) The cells in epithelial tissue are tightly packed together with very little intercellular matrix. ... Epithelial cells may be squamous, cuboidal, or columnar in shape and may be arranged in single or multiple layers. Simple cuboidal epithelium is found in glandular tissue and in the kidney tubules
29) Simple squamous epithelia are found in capillaries, alveoli, glomeruli, and other tissues where rapid diffusion is required. Cells are flat with flattened and oblong nuclei. It is also called pavement epithelium due to its tile-like appearance. This epithelium is associated with filtration and diffusion.
30) Simple columnar epithelial cells are some of the most prolific cells in the body, mainly because they can fulfill so many functions. They are found throughout the body's organ system, including the digestive tract and the female reproductive system. They are found in the respiratory system, including the nasal passage.
31) Glandular epithelium
Definition: A single cell or group of cells that produce and secrete specific products (e.g., mucin). Glandular epithelium commonly invaginates from surface epithelium into other tissue (e.g., connective tissue), but it is separated from the tissue by the basal lamina.
32) The common cell types in connective tissue include: fibroblasts, mast cells, plasma cells, macrophages, adipocytes, and leukocytes. ... Fibroblasts are the most common cell type of connective tissue. They produce both fibers and amorphous ground substance. Typically only the oval nuclei are visible.
33) Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues. forming blood clots to prevent excess blood loss. carrying cells and antibodies that fight infection.
34) A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.
35) A tendon is a fibrous connective tissue which attaches muscle to bone. Tendons may also attach muscles to structures such as the eyeball. ... A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.
36) Cartilage is a tough but flexible tissue that is the main type of connective tissue in the body. Around 65–80% of cartilage is water, although that decreases in older people, and the rest is a gel-like substance called the 'matrix' that gives it its form and function.
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