Question

Question 1
Name the following.
a) The collective terın for Phellogen, Phellym and Phelloderm.
b) The ring formed by Spring wood and autumn wood as alternate concentric rings.
c) Cells of cambium present between primary xylem and primary phloem
d) The cells of the medullary rays. adjoining the intrafascicular cambium that become meristematic
c) Digestive enzymes in cockroach are secreted from this organ.
f) Adhesive pads present in legs of Cockroach

Answer 1

ANSWER

ANSWERIn large trees the seasonal fluctuation will affect the growth of secondary xylem. Two types of wood formation occur during the spring season and the summer season, they are called as the spring wood and the summer wood respectively.

ANSWERIn large trees the seasonal fluctuation will affect the growth of secondary xylem. Two types of wood formation occur during the spring season and the summer season, they are called as the spring wood and the summer wood respectively. The xylem formed during the spring season contains numerous large vessels with wider lumen and possess less amount fibres. So, it acquires a greater radial width than the summer wood. The xylem formed during the summer and autumn season is very less amount since the activity of the cambium is highly reduced. The vessels are thick walled with narrow lumen and the summer woods possess mainly fibres and narrow vessels.

ANSWERIn large trees the seasonal fluctuation will affect the growth of secondary xylem. Two types of wood formation occur during the spring season and the summer season, they are called as the spring wood and the summer wood respectively. The xylem formed during the spring season contains numerous large vessels with wider lumen and possess less amount fibres. So, it acquires a greater radial width than the summer wood. The xylem formed during the summer and autumn season is very less amount since the activity of the cambium is highly reduced. The vessels are thick walled with narrow lumen and the summer woods possess mainly fibres and narrow vessels. The spring wood is also called as the early wood, whereas the summer wood or autumn wood is called as the late wood. The early wood and the late wood occur appears in the form of concentric rings known as the annual rings. Autumn wood is not differentiated from spring wood in colour of xylem and cambium. Thus, option B is correct.

Answer 2

Answer:

a. periderm

b. These are called annual rings and can provide rough estimate of the age of the tree.

c. the procambium is the primary meristematic tissue between the primary phloem and xylem.

d. form the interfascicular cambium.

e. The majority of digestive enzymes are produced in the midgut, gastric caeca and salivary glands, and these enzymes can somehow be transported to other tissues such as the foregut.

f. Plantulae

Explanation:

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