Class 7 worksheet/science/Ch 6,7

(A)Answer in one word:-

1. Transportation of material in plant carried out by. Vascular system
2. A membrane that selectively allows certain molecules or ions to diffuse through it. Semipermeable
membrane
3. Movement of water molecules from an area of higher concentration to area of lower concentration
across semi permeable membrane. Osmosis
4. The word movement of sap through xylem Ascent of sap
5. The cells of phloem make transport of food possible the cells called as. Sieve tube
6. Red colour pigment which gives blood its colour. Haemoglobin
7. A pale yellow colour liquid containing 92% water. Plasma
8. No mixing of oxygenated and deoxygenated blood in heart because of a partition. Septum
9. The process of elimination of waste product and foreign substance by an organism. Excretion
10. Smaller and simple organism excrete by the process of. Diffusion
11. The process by which organism produce off spring which are similar to them in structure and
function. Reproduction
12. These are fleshy,horizontal,underground stem capable of producing root and shoot to give rise to
the new plant also called as root stalks. Rhizomes
13. The anther of Stamen contain very tiny yellowish,spherical structure. Pollen grains.
14. Pollen grain fall on the stigma of same flower or another flower of same plant. Self pollination
15. The female reproductive part of a flower. Pistil.

(B) Fill in the blanks:-

1.Water is continuously lost from leaves through the process of__transpiration__.
2. __Xylem__ are thick-walled and dead.
3.__Phloems____ transport food from the leaves to the other part of plant.
4. Blood is medium of transport consisting ___blood cell__of suspended in a fluid medium
called_plasma__.
5. __stethoscope__ is a medical device used to listen the internal sound of the body.
6. Components which are not usable by the body called__metabolic waste__.
7. _Nephrones_are coil tube with a cup shape funnel in which the process of filtration takes place.
8. Thick-walled blood vessels carrying blood away from the heart is _Arteries_.
9. A male parent produce the_male gamete__ and female parent produce the _female
gamete__,which fuse to form a__zygote__.
10. Spirogyra is reproduce by__fermentation__.
11. Bryophyllum and Begonia are reproduced from buds on__leaves_.
12.__sepals__and _petals_ are accessories reproductive organs.
13. _zoophily_ is a form of pollination where pollen is carried and dispersed by birds, mammals.
14. The _seed_ is the dormant phase of the plant.
15. Flowers have both male and female organ are called__bisexual_flower.

Ch 11, 12 & 14

Answer the following questions in one word.
1.Form of energy capable of doing work heat
2. The action of one surface or object rubbing against another friction
3. A device that automatically regulates temperature thermostat
4.Mercury thermometer with a temperature range of -10 degree Celsius to 100 degree Celsius
laboratory thermometer
5.The lowest possible temperature at which all vibrations almost cease. Absolute zero
6.The degree of hotness and coldness of a body temperature
7.Increasing size or volume brought about by heat thermal expansion
8.A liquid metal which expands on heating mercury
9.The process of transfer of heat energy through a substance with the help of vibrating molecules
conduction.
10.A process of heat transfer without the help of any intervening media Radiation
11.Streams of warm moving fluid.
12.Substance with low level of thermal conductivity bad conductor or insulator
13.The breeze which blows from sea to the land coastal breeze
14.Substance which allow heat to pass through them conductor
15.The fastest mode of transfer of heat. Radiation
16.Waste from basin ,bath and kitchen sullage
17.It is the liquid or semi liquid waste produced by human activities. Sewage
18.The organic part removed by scraper at clarifier in WWTP Sludge.
19.Lighter material removed with the help of skimmer at clarifier in WWTP Scum

Q.2 Fill in the blanks.

1.The..sun.. is the most important natural source of heat.
2.Expansion in gases is .. maximum.. when heat is supplied
3.Water expand at the…below 4 °c.. Temperature
4.The instrument which help us to measure the temperature of an object is called .. thermometer..
5.Expansion caused due to heat is called ..thermal.. expansion.
6.Freezing point of water in Kelvin is ..273… K.
7.Fahrenheit scale was designed by…
8..kelvin... is the SI unit of temperature.
9.The range of temperature in clinical thermometer is …35.. °C to ..42… °C.
10.The normal body temperature is …37°c….
11.All materials are made up of tiny particles are called.. molecules…..
12. Silver... Metal is known as the best conductor of heat.
13.Anything that can flow freely is called …fluid….
14.conduction.. Is the mode of heat transfer in solids.
15.The process of heat transfer within the same object is known as.. conduction
16.In …convection..process of transfer of heat take place by the actual movement of particle
17.The chlorinated water is called .. effluent..
18.Disease causing microorganisms and other impurities in the waste water is called.
Contaminants…
19.Waste from toilets, which includes faeces and urine is called ..foul waste..
Ch 9 & 10
1. The flow of electric charge through a conductor. electric current
2. The path following by Electric current circuit
3. A device which is used to start and stop the flow of current in the circuit switch
4. An electrical component which offers resistance to the flow of current resistor
5. A circuit where two or more devices are connected one after the another series circuit
6. An electric switch which automatically turns of when current in a circuit exceeds the save limit
MCB
7. The branch of Physics which deals with the relationship between electricity and Electromagnetism
8. Special trains having electromagnets fixed at the base. Maglev
9. A safety device that is used to safeguard electrical appreciation and electric circuit from high and
abrupt electric current Fuse
10. An electromotive force responsible for the flow of current. Voltage
11. The degree to which a material or device opposes the passage of electric current. Resistance
12. Geometrical centre of the sphere of which the mirror forms a part. Centre of curvature
13. A line passing through the pole and the centre of curvature. Principal of axis
14. The phenomenon of splitting of light into its 7 constituent colors. Dispersion of light
15. The point on the principal axis at which all parallel beams converge or appear to diverge.
16. Lens which bulges outward on both side from the middle. Convex
17. Lens which bulges inward from the middle. Concave
18. Phenomenon of bouncing back of a light ray when it falls on a surface. Reflection
19. Midpoint of the line joining the poles of a lens. Optical centre
20. An image which cannot be obtained on a screen. Virtual image
Q. 2 Fill in the blanks.
1.The colour of the rainbow are arranged in specific order called___Spectrum__.
2.A __convex_ lens can produce both real and virtual images.
3.A mirror in which reflection takes place from the bulging outer surface is called __convex_.
4.__concave_ lens is called diverging lens.
5.A _beam__ is stream of light.
6.Strength of an electromagnet depends on the nature of __core_ material.
7.Conducting wire of longer length offers _more_ resistance.
8.A fuse wire is usually made of a _lead tin_ alloy and has a low _melting_ point.
9.The potential difference is measured in__volt__.
10.A __parellel_ circuit allows all devices to operate at the same voltage.
11._nichrome_ where is used as a heating device because it as very high resistance

Chapter 4&5
(A) Answer in one word: -
1.Compounds that produce positive hydrogen ions. Acids.
2.Compounds which do not dissociate completely in water and furnish a small number of hydrogen
ions. Weak acid
3.Charged atom or group of charge atoms are called as ions
4.Positively charged ion are called as cation
5.Acids are used to remove salt scales from steam boilers, the process of removing scales is known
descaling
6.Substance is used to prepare bleaching powder which is used for brightening of white clothes
7.A chemical substance that is used to identify whether a compound is acidic or basic by showing
the colour change. Indicator
8.Process in which an acid completely reacts with a base or vice versa to form salt and water
9.The tendency of some salts to absorb moisture from nature.hygroscopic
10.The movement of gases from region of higher concentration to region of lower concentration.
Diffusion
11.The cell supports the structure and function of the stomatal apparatus. Subsidiary cell
12.Insect respire through very fine air holes on their bodies called as spiracles
13.The opening of pharynx into trachea is called
14.The glottis is guarded by a flap like a structure epiglottis
15.Cellular respiration occurs in this cell organelle and also called as power house of cell.
Mitochondria

(B) Fill in the blanks: -

1.Bases are the compounds that produce _hydroxyl ions_ in water.
2.The acid present in vinegar and cold drinks are_acetic acid_and__carbonic acid__respectively.
3.__acids_ are also used as cleaning agent and ink remover.
4.Red cabbage, China rose and litmus solution are the types of _natural indicator_.
5._Phenophthalein_ indicator shows dark pink in acid and __no__ colour in base.
6._metal salt_ formed when a metal replaces the hydrogen of acid.
7.__silver salt_ is used in developing photographic films.
8.Small pores for the gases exchange in leaves__stomata_ and _lenticles__in stems.
9.In insects’ air enters through the spiracles and is distributed all over the body by__tracheal tube__.
10.Trachea in the chest vision divides into two tubes__bronchiole__
11.The air sacs are made up of very small, thin walled structure called_alveoli__
12.The amount of air breathed in or out in one breath during respiration_tidal volume_