Tissues — Science STD 9 — Question

Write down four main characters of gymno-sperms.

i. Which process in meristematic tissue converts it to permanent tissue?
ii. Which feature of meristematic tissue helps aquatic plants to maintain buoyancy in water?
iii. Why epidermis of plants living in dry habitats is thicker?
iv. Identify the following.
a. Living component of xylem
b. Dead element of phloem
v. Which type of conducting tissues conduct water and minerals vertically?

1. Name the phenomenon which helps fresh water unicellular organisms (e.g. Amoeba) continuously gain water in their bodies. Also, name the mechanisms by which these organisms throw out excess of water from their bodies.
2. Give at least two examples in plants where similar phenomenon in used to gain water.

What will happen if: (a) Bone is dpiied in hydrochloric acid (HCI); (b) Bone is dried?

Give any two ways in which these tissues differ functionally from each other.

Name in which: Virus, bacterium and protozoa can be causal agent.

Why is organic matter important for crop production?