Natural Resources — Science STD 9 — Question

Give four general characters of phylum Mollusca. Write down two examples.

A cheetah starts from rest, and accelerates at 2m/s² for 10 seconds. Calculate:
The distance travelled.

"We can treat an infectious disease by killing microbe". Justify the statement with suitable examples.

Explain why, a cricket player moves his hands backwards while catching a fast cricket ball.

Due to heavy rains and speedy winds a tree broke and fell on the road. Two persons from local shops came and begin to remove that broken part of the tree, but in vain as the log was too heavy. A passerby came to their help with a few solid heavy sticks. Consequently, the heavy log was put aside and the commutation on the road began as usual.
(a) Comment upon the value(s) displayed by the passerby?
(b) Name the energy stored when the heavy log of the tree was lifted to some height?

On the basis of the number of protons, neutrons and electrons in the samples given below identify
i. the cation.
ii. the pair of isobars, and
iii. the pair of isotopes.

Sample	Protons	Neutrons	Electrons
A	17	18	16
B	18	19	18
C	17	20	17
D	17	17	17

What is ozone hole? Where is it located? is it formed?

Write one function of squamous epithelium.