Question

CLASS - VIII
COMPREHENSIVE EXAMINATION (2019-20
SUBJECT - GENERAL SCIENCE
TIME: 3 Hrs.
(i) All questions are compulsory.
(ii) Draw diagrams wherever necessary.
(iii) Marks allocated to each question are indicated against it.
u. A metal was burnt in air. The substance formed was dissolved in water and te
red litmus paper. What result do you expect?
Name any two structures which are present in a plant cell but not in an anima
How is electronic current different from conventional current? *
Name one thermosetting plastic, which is a good insulator and is used to ma
switches.
5. Give one important use of algae. —
3.
1. Why do mountaineers usually suffer from nose bleeds at high altitudes?
17. State an advantage of galvanized iron over tin-plated iron. +​

Answer 1

Answer:

in plant cell centeriole and lysosomes are two structure which is present but not in animal ✌

Answer 2

Answer:

1. most metals show basic property when they produce any compound reacting with other elements. so litmus will turn blue

2. plant cells have plastid and cell wall which animal cells don't have

3. algae produce food by themselves as they are autophytic and help other aquatic organisms in their food intake

4. mountaineers suffer from nose bleed because there is low pressure in high ranges which the body cannot endure.

5.