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Science SA-2 (Class 7B)

Total questions: 60

Worksheet time: 31mins

Name
Class
Date
1.

The yeast is _____

a)

Unicellular

b)

Multicellular

2.

Yeast Reproduce through

a)

Sexual Reproduction

b)

Asexual Reproduction - Vegetative Propogation

c)

Asexual Reproduction - Fragmentaion

d)

Asexual Reproduction - Budding

3.

Moulds Reproduce through

a)

Sexual Reproduction

b)

Asexual Reproduction - Vegetative Propogation

c)

Asexual Reproduction - Spore Formation

d)

Asexual Reproduction - Budding

4.

Dark Radiating Rows under the head of the mushroom are called

a)

Spores

b)

Gill

c)

Trunks

d)

None of these

5.

Spore bearing structures are called

a)

Gills

b)

Sori

c)

Bulb

d)

None of these

6.

Type of alga which reproduce through Fragmentation

a)

Spirogyra

b)

Bulb

c)

Spores

d)

Blobs

7.

Under ground stem of potato is

a)

Bulb

b)

Tuber

c)

Cutting

d)

None of these

8.

Chrysanthemum are ____________ stems

a)

Underground

b)

Normal

c)

Floating

d)

None of these

9.

Bottle Gourd flowers have _______ flowers

a)

Unisexual

b)

Bisexual

c)

Both of these

d)

None of these

10.

Upon reaching the stigma, a pollen grain germinates to _________

a)

Two male reproductive cell

b)

Pollen tube

c)

Both of these

d)

None of these

11.

The fusion of male reproductive cell and the Polar Nuclei form

a)

Zygote

b)

Embryo

c)

Endosperm

d)

All of these

12.

Cockroaches use which type of respiration

a)

Spiracles

b)

Gills

c)

Lungs

d)

Skin

13.

Birds use which type of respiration

a)

Spiracles

b)

Gills

c)

Lungs

d)

Skin

14.

Birds use which type of respiration

a)

Spiracles

b)

Gills

c)

Lungs

d)

Skin

15.

Frogs use which type of respiration

a)

Spiracles

b)

Gills

c)

Lungs

d)

Skin

16.

Birds use which type of respiration

a)

Spiracles

b)

Gills

c)

Lungs

d)

Skin

17.

Which of these regulate the opening and closing of stomata

a)

Guard cells

b)

Chloroplast

c)

Vacuole

d)

Nucleus

18.

Plants also respire through ________ on stem, petiole and fruits.

a)

Spores

b)

Lenticels

c)

Spiracles

d)

All of these

19.

The respiration rate when we are resting is _______ per minute

a)

12 to 16

b)

15 to 20

c)

10 to 15

d)

7 to 10

20.

Anaerobic respiration is also called

a)

Farmentation

b)

Fragmentation

c)

Fermentation

d)

None of these

21.

The oxygen combines with the haemoglobin to form

a)

Oxyginated haemoglobin

b)

Oxygen haemoglobin

c)

Oxyhaemoglobin

d)

None of these

22.

Convex Mirror forms _______ image

a)

Real Image

b)

Virtual Image

c)

Diminished

d)

Magnified

23.

Concave Mirror forms _______ image

a)

Real Image

b)

Virtual Image

c)

Diminished

d)

Magnified

24.

Light always travels in _______ line

a)

Straight

b)

Bent

c)

Zig - zag

d)

None of these

25.

The imaginary line through the center of the plane mirror is called

a)

Normal

b)

Pole

c)

Principal Axis

d)

All of these

26.

The imaginary line through the center of the Concave and Convex mirror is called

a)

Normal

b)

Pole

c)

Principal Axis

d)

All of these

27.

The centre point of the Concave and Convex mirror is called

a)

Normal

b)

Pole

c)

Principal Axis

d)

All of these

28.

The point where light rays of the Concave and Convex mirror is called

a)

Normal

b)

Pole

c)

Principal Focus

d)

All of these

29.

The centre point of the Concave and Convex lens is called

a)

Lens Centre

b)

Optical Centre

c)

Principal Axis

d)

All of these

30.

Tell the correct sequence

a)

VIBGYOR

b)

ROYGBIV

31.

The closely wound length of wire is called a _________

a)

Coil

b)

Line

c)

Fuse

d)

None of these

32.

Name the type of iron used in electromagnets

a)

Soft

b)

Hard

33.

Low-Resistance connection between two points across which there is a voltage is called

a)

Heating Effect

b)

Short CIrcuit

c)

Electric Magnet

d)

All of these

34.

The path along which electric current can flow is called

a)

Electric Circuit

b)

Overload

c)

Coil

d)

Voltage

35.

The greater the ______ across a device, the greater is the current through it.

a)

Voltage

b)

Electric Current

c)

Resistance

d)

None of these

36.

Filament in Bulbs is made up of

a)

Tungsten

b)

Iron

c)

Silver

d)

All of these

37.

Two or more cells are joined to form

a)

Multicell

b)

Battery

c)

Wire

d)

None of these

38.

Assertion: Underground stems of onion and garlic are known as bulbs.

Reason: Underground stems of ginger and turmeric are known as rhizomes.

a)

If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

b)

If both Assertion and Reason are true but Reason is not the correct explanation of

Assertion.

c)

If Assertion is true but Reason is false.

d)

If both Assertion and Reason are false.

39.

Assertion (A): The filament of the bulb is made up of silver

Reason (R) : It has low melting point

a)

If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

b)

If both Assertion and Reason are true but Reason is not the correct explanation of

Assertion.

c)

If Assertion is true but Reason is false.

d)

If both Assertion and Reason are false.

40.

Assertion: Concave mirrors are converging mirror

Reason: When a light falls on a concave mirror, it meets at a point

a)

If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

b)

If both Assertion and Reason are true but Reason is not the correct explanation of

Assertion.

c)

If Assertion is true but Reason is false.

d)

If both Assertion and Reason are false.

41.

Assertion: The haemoglobin combines with oxygen to form oxyhaemoglibin.

Reason: The oxygen is stored in heme in the haemoglobin

a)

If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

b)

If both Assertion and Reason are true but Reason is not the correct explanation of

Assertion.

c)

If Assertion is true but Reason is false.

d)

If both Assertion and Reason are false.

42.

Change in which no new substance is formed is called

a)

Physical

b)

Chemical

43.

Change in which new substance is formed is called

a)

Physical

b)

Chemical

44.

The phenomenon of some solids form vapors on being heated is called

a)

Freezing

b)

Melting

c)

Sublimation

d)

Sublimate

45.

The phenomenon of some vapors form solid on being cooled is called

a)

Freezing

b)

Melting

c)

Sublimation

d)

Sublimate

46.

The phenomenon of some liquid form solid on being cooled is called

a)

Freezing

b)

Melting

c)

Sublimation

d)

Sublimate

47.

The phenomenon of some solid form liquid on being heated is called

a)

Freezing

b)

Melting

c)

Sublimation

d)

Sublimate

48.

The phenomenon of some liquid to gas on being heated is called

a)

Freezing

b)

Melting

c)

Vaporization

d)

Condensation

49.

The phenomenon of some gas to liquid on being heated is called

a)

Freezing

b)

Melting

c)

Vaporization

d)

Condensation

50.

Iron is _________

a)

Metallic solid

b)

Liquid

c)

Gas

d)

None of these

51.

One liquid dissolves into another liquid, it is called

a)

Miscible

b)

Immiscible

52.

One liquid do not dissolves into another liquid, it is called

a)

Miscible

b)

Immiscible

53.

Two homogenous mixtures by a special method called

a)

Centrifugation

b)

Fractional Distillation

54.

Petrol, Kerosene, Diesel, Natural Gas and LPG contain mixtures of

a)

Hydrocarbon

b)

Carbon

c)

Hydrogen

d)

All of these

55.

Iron combines with oxygen and moisture to form

a)

Hydrocarbon

b)

Water

c)

Physical

d)

None of these

56.

2Mg + O2 =

a)

Oxygen dioxide

b)

Magnesium dioxide

c)

Hydromagnesium

d)

None of these

57.

2NaHCO3 = Na2CO3 + H2O + CO2

a)

Combination

b)

Decomposition

c)

Displacement

d)

Nuetralization

58.

C + O2 = CO2

a)

Combination

b)

Decomposition

c)

Displacement

d)

Nuetralization

59.

Fe + CuSO4 = Cu + FeSO4

a)

Combination

b)

Decomposition

c)

Displacement

d)

Nuetralization

60.

Assertion : C + O2 = CO2

Reason : It is a combination reaction

a)

If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

b)

If both Assertion and Reason are true but Reason is not the correct explanation of

Assertion.

c)

If Assertion is true but Reason is false.

d)

If both Assertion and Reason are false.

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