Tissues — Science STD 9 — Question

Figure X showa a trace of a sound wave produced by a particular tuning fork:

1. On the graph paper given in Figure Y, draw a trace of the sound wave which has higher frequency than that shown in Figure X.
2. On the graph paper shoen in Figure Z, draw a trace of the sound wave which has a larger amplitude than that shown in Figure X.

There are four substances W, X, Y and Z. The substance W is a dark violet solid having diatomic molecules. A solution of W in alcohol is used as a common antiseptic C. The substance X is a white solid which is usually recovered from sea water on a large scale. The substance Y is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance Z is a yet another white solid which is used in making commonly used dry cells.

1. Name (i) W (ii) X (iii) Y and (iv) Z.
2. Out of W, X, Y and Z, which substance/ substances can undergo sublimation?
3. Which substances organic in nature?
4. What is the name of substance C?
5. Which substance belongs to the halogen family?

Write a note on cattle feed.

A body starting from rest travels with uniform acceleration. If it travels 100m in 5s, what is the value of acceleration?

Describe the Rutherford’s model of an atom. State one drawback of Rutherford’s model of the atom.

State the various postulates of Dalton’s atomic theory of matter.

1. Identify the figure. What is its function?
2. Label V and W.
3. Label X, Y and Z.
4. W loses its nucleus in the mature state, still it remains alive. Explain how?

Give an illustrated account of nucleus.

How are simple tissues different from complex tissues in plants?