KENDRIYA VIDYALAYA BAGESHWAR

PERIODIC TEST-1 (2022 – 23)

CLASS - VII
SCIENCE

Time: Maximum Marks: 40

General Instructions:
The Question Paper contains four sections.
Section A contains 12 Multiple choice questions of 1 mark and all the questions are compulsory.
Section B contains case based 12 questions of 1 mark each and all the questions are compulsory.
Section C contains 7 questions of 2 and 4 marks each, under which choices are given.

PART A
Q1Green pigment present in the leaves is called? (1 M)
(a) haemoglobin (b) globulin (c) albumin (d) chlorophyll
Q2. Bile is produced in? (1 M)
(a) Gall bladder (b) Blood (c) Liver (d) Spleen
Q3. Heat always flows? (1 M)
(a) from a colder object to a hotter object
(b) from a hotter object to a colder object
(c) in both the directions
(d) heat never flows from one object to other
Q4. How many premolars teeth found in mouth? (1 M)
(a) 2 (b) 4 (c) 6 (d) 8
Q5. Wool fibre cannot be obtained from which of the following? (1 M)
(a) Goat (b) Llama (c) Alpaca (d) Moth
Q6. Human beings can be categorised as? (1 M)
(a) heterotrophs (b) autotrophs (c) parasites (d)
saprotrophs
Q7. What is the scientific name of mulberry tree? (1 M)
(a) Magnifera indica (b) Morus alba (c) Desmodium
girence (d) None
Q8. Out of these gases which one is used in fire extinguishers? (1 M)
(a) CO2 (b) SO2 (c) NO2 (d) H2S
Q9. The finger-like outgrowths of Amoeba help to ingest food. However, the
finger-like outgrowths of human intestine help to? (1 M)
(a) digest the fatty food substances (b) make the food soluble
(c) absorb the digested food (d) absorb the undigested food
Q10. Conduction is the method of transfer of heat in? (1 M)
(a) liquids (b) solids (c) gases (d) vacuum
Q11. When the soil is too basic, plants do not grow well in it. To improve its
quality what must be added to the soil? (1 M)
(a) Organic matter (b) Quick lime (c) Slaked lime (d) Calamine
solution
Q12. Which one is filled in the bulb of a thermometer? (1 M)
(a) Mercury (b) Lead (c) Copper (d) Silver
PART B
Observe the given picture and answer the following questions: (1 x 4 =
4 M)
Indicators are substances that are used to test whether a substance is acidic or
basic ot neutral in nature. They change their color when added to a solution
containing an acidic or a basic substance. Indicators are of two types - natural
and artificial. Naturally occurring indicators are turmeric, litmus, china rose and
red cabbage.

Litmus
Litmus is a natural dye extracted from lichens. It is the most commonly used
natural indicator.
Turmeric
Turmeric compound is a naturally occurring yellow colour compound. It is an
acid-base indicator
China Rose
Soak some petals of china rose in warm water for a couple of hours. The red-
colored solution is used as an indicator for detecting an acid or a base solution.

Q13. Turmeric is a natural indicator. On adding its paste to acid and base
separately, which colours would be observed.
(a) Yellow in both acid and base
(b) Yellow in acid and red in base
(c) Pink in acid and yellow in base
(d) Red in acid and blue in base
Q14. Phenolphthalein is a synthetic indicator and its colours in acidic and basic
solutions, respectively are:
(a) red and blue
(b) blue and red
(c) pink and colourless
(d) colourless and pink
Q15. Select the source of litmus paper:
(a) Lichen (b) Cuscuta (c) Pitcher plant (d) Rhizobium
Q16. What will be the chemical nature of material which does change the colour
of red litmus paper?
(a) Acidic (b) basic (c) neutral (d) none
Read the given information and answer the following questions: (1 x 4
= 4 M)
Photosynthesis is the process by which a plant produces its food by converting
light energy into chemical energy. Plants use few substances to produce their
food. Understanding the process of photosynthesis means a clear concept about
the different cellular and chemical activities going on in the plant body. The word
photosynthesis is coined from the Greek word for meaning light along with
synthesis. This implies a synthesis i.e a chemical reaction using light energy. This
is not always for green plants only but certain bacteria and prokaryotes also use
this process to prepare their food. In green plants or algae, the synthesis takes
place within an important organelle called chloroplast where the pigment
chlorophyll is present.
Q17. The raw materials for photosynthesis are
(а) CO2 (b) CO2, O2, H2 (c) N2 water (d)
O2 water
Q18. The end products of photosynthesis are
(a) carbohydrates, oxygen (b) carbohydrates, hydrogen
(c) carbohydrates, water vapours (d) carbohydrates, oxygen and
water vapours
Q19. Which of the following organisms have a member who is able to perform
photosynthesis?
(a) Fungi (b) Dog (c) Lichens (d) Bryophytes
Q20. Tiny pores present on the surface of leaves through which gaseous
exchange occurs are called
(a) stomata (b) guard cells (c) food holes (d) gas
holes

Observe the given picture and answer the following questions. (1 x 4 =

4 M)

Q21. Enzymes present in saliva converts

(a) starch into simple sugars (b) proteins into amino acids
(c) complex sugars into simple sugars (d) fats into fatty acids and glycerol
Q22. The process of taking food in the body is known as
(a) egestion (b) ingestion (c) digestion (d) assimilation
Q23. Which of the following is the term used for the
partially digested food in the rumen of animals?
(a) Cud (b) Food (c) Juice (d)
Liquid
Q24. Ruminants can
(a) digest the cellulose (b) not digest the cellulose
(c) may or may not digest cellulose (d) all
of these
PART C
Q25. Describe the process of neutralisation with the
help of an example.
(2 M)
OR
State one similarity and one difference between clinical and laboratory
thermometer.

Q26. Explain why (ANY TWO): (2 M)

a) It is advised that the outer walls of houses be painted white
b) An antacid tablet is taken when you suffer from acidity.
c) Factory waste is neutralised before disposing it into the water bodies.
Q27. Distinguish between Parasites and Saprotrophs with one example of each.
(2 M)
OR
Distinguish between Insectivorous plants and symbiotic relationship with one
example of each.
Q28. Define any two terms from the following: (2 M)
(i) Rearing (ii) Shearing (iii) Sericulture
Q29. Answer in one word(ANY FOUR) (1 x 4 = 4M)
a) Its leaves are eaten up by silkworms.
b) A plant that has both autotrophic and heterotrophic mode of nutrition.
c) Water from the undigested food is absorbed mainly in the:
d) Ammonia is found in many household products, such as window cleaners.
It turns red litmus blue. What is its nature?
e) Long thread like structure
f) Finger like projections in the inner wall of small intertine
Q30. Draw a neat and clean diagram of Life cycle of Silk moth and label it. (4M)
OR
Draw a neat and clean diagram of Human Digestive system and label it.