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Tissues

List the characteristics of cork. How are they formed? Mention their role.

05/11/2024

Science

9th

Sound

In the following statements, tick ‘T’ against those which are true, and ‘F’
against those which are false.
(a) Sound cannot travel in vacuum. (T/F)
(b) The number of oscillations per second of a vibrating object is called
its time period. (T/F)
(c) If the amplitude of vibration is large, sound is feeble. (T/F)
(d) For human ears, the audible range is 20 Hz to 20,000 Hz. (T/F)
(e) The lower the frequency of vibration, the higher is the pitch. (T/F)
(f) Unwanted or unpleasant sound is termed as music. (T/F)
(g) Noise pollution may cause partial hearing impairment. (T/F)

05/11/2024

Science

8th

Tissues

Give reasons for
(a) Meristematic cells have a prominent nucleus and dense cytoplasm but they lack vacuole.
(b) Intercellular spaces are absent in sclerenchymatous tissues.
(c) We get a crunchy and granular feeling, when we chew pear fruit.
(d) Branches of a tree move and bend freely in high wind velocity.
(e) It is difficult to pull out the husk of a coconut tree.

05/11/2024

Science

9th

Tissues

Draw well labelled diagrams of various types of muscles found in human body.

05/11/2024

Science

9th

Tissues

Describe the structure and function of different types of epithelial tissues. Draw diagram of each type of epithelial tissue.

05/11/2024

Science

9th

Tissues

Differentiate between sclerenchyma and parenchyma tissues. Draw well labelled diagram.

05/11/2024

Science

9th

Tissues

Fill in the blanks
(a) ———are forms of complex tissue.
(b) ———have guard cells.
(c) Cells of cork contain a chemical called———
(d) Husk of coconut is made of ———tissue.
(e) ———gives flexibility in plants.
(f) ———and———are both conducting tissues.
(g) Xylem transports———and———from soil.
(h) Phloem transport———from———to other parts of the plant

05/11/2024

Science

9th

Tissues

Why is epidermis important for the plants?

05/11/2024

Science

9th

Tissues

Fill in the blanks
(a) Cork cells possesses———on their walls that makes it impervious to gases and water.
(b) ——— have tubular cells with perforated walls and are living in nature.
(c) Bone possesses a hard matrix composed of———and ———.

05/11/2024

Science

9th

Tissues

Which structure protects the plant body against the invasion of parasites?

05/11/2024

Science

9th