Class 7 Science Important Questions for exams

Class 7 Science Important Questions for exams. Please refer to the examination notes which you can use for preparing and revising for exams. These notes will help you to revise the concepts quickly and get good marks.

Question Bank

Biology

QUESTION BANK
PHYSICS & CHEMISTRY

1. Define the following terms;
a) Temperature
b) Thermometer
c) Conduction
d) Convection
e) Radiation

Answer:
a) Temperature: It is the degree of hotness or coldness of a body.
b) Thermometer: It is a device used to measure the temperature of a body.
c) Conduction: It is the transfer of heat from the hotter part of a solid to its colder part through direct molecular contact, without the movement of the particles.
d) Convection: It is the transfer of heat in liquids and gases by the actual movement of the particles of the substance, forming convection currents.
e) Radiation: It is the transfer of heat from a hot body to its surroundings without needing any medium.

Teacher's Note:
a) Temperature tells how hot a body is; heat is the energy that flows.
b) Conduction needs a solid; convection needs a liquid or gas; radiation needs no medium.

2. Match the following statements
a) Conduction i) Insulator
b) Glass ii) Convection currents
c) Sun's Energy iii) Direct molecular contact
d) Sea breeze iv) Summer
e) Light colours v) Radiation

Answer:
a) Conduction - iii) Direct molecular contact
b) Glass - i) Insulator
c) Sun's Energy - v) Radiation
d) Sea breeze - ii) Convection currents
e) Light colours - iv) Summer

Teacher's Note:
a) Light colours reflect more heat, so they are preferred in summer.
b) Sea breeze blows because warm air over land rises and cooler air from the sea moves in, a convection current.

3. Differentiate between a clinical and a laboratory thermometer.

Answer:

Teacher's Note:
a) The kink in a clinical thermometer holds the reading.
b) Mention range, use and kink in the answer; these are the three points examiners look for.

4. What is the normal human body temperature?

Answer: The normal human body temperature is 37°C (98.6°F).

Teacher's Note:
a) Normal body temperature is the same in all healthy people, about 37°C.
b) Always write the unit with the value.

5. What precautions should be taken while reading a clinical thermometer?

Answer:
1. Wash the thermometer with an antiseptic solution before and after use.
2. Shake it well so that the mercury level falls below 35°C before use.
3. Place the bulb properly under the tongue or in the armpit.
4. Read it at eye level by holding it away from the body without touching the bulb.
5. Handle it carefully, as it is made of glass, and never heat it over a flame.

Teacher's Note:
a) Shaking the thermometer before use is the most commonly tested point.
b) Reading must be taken with the eye in line with the mercury level.
c) Never use a clinical thermometer to measure boiling water; it can break.

6. Differentiate between conductors and insulators giving examples.

Answer:

Teacher's Note:
a) Give at least two examples of each.
b) Metals are good conductors; most non-metals are insulators.

7. Why is the bottom of a cooking untensil blackened?

Answer:
1. Black surfaces are good absorbers of heat radiation.
2. The blackened bottom absorbs more heat from the flame, so food cooks faster.

Teacher's Note:
a) Dark and rough surfaces absorb more heat; bright and shiny surfaces reflect it.
b) The same reason makes us wear light colours in summer.

8. Why is the handle of a metallic kettle covered with the strips of cane?

Answer:
1. Cane is a bad conductor (insulator) of heat.
2. It does not allow heat to pass from the hot kettle to the hand, so the handle can be held safely.

Teacher's Note:
a) Metals conduct heat quickly and would burn the hand.
b) Plastic or wood is used in the same way in other utensils.

9. Describe an activity to show
a) Copper is a good conductor while glass is an insulator
b) Convection

Answer:
a) Copper and glass:

1. Take a copper wire and a glass rod of the same length and thickness.

2. Fix small pieces of wax at equal distances along each with the help of a pin, and hold both with the free ends in the same flame.

3. The wax on the copper wire melts and the pins fall one after the other quickly, but the wax on the glass rod does not melt.

4. This shows that copper is a good conductor of heat while glass is an insulator.
b) Convection:

1. Fill a beaker with water and drop a few crystals of potassium permanganate near its side at the bottom.

2. Heat the beaker just below the crystals with a burner.

3. Coloured streaks of water rise from the bottom, spread along the top and then come down along the cooler sides.

4. This shows that heat is carried by the movement of water particles, which is convection.

Teacher's Note:
a) Write the apparatus, the steps and the observation for each activity.
b) Hot water becomes lighter and rises, while colder water moves down to take its place.
c) Do not mix up the sequence: the wax melts first near the flame.

10. What is the S.I. unit of time?

Answer: The S.I. unit of time is the second (s).

Teacher's Note:
a) Larger units are minute, hour and day.

11. Name an ancient clock which is based on the change in length of shadow with the change in sun's position.

Answer: Sundial

Teacher's Note:
a) A sundial shows time from the shadow of a pointer cast by the sun.
b) Shadow is longest in morning and evening and shortest at noon.

12. Which quantity is equivalent to the distance covered in a unit time?

Answer: Speed

Teacher's Note:
a) Speed = distance ÷ time.

13. Define speed. What is its S.I. unit?

Answer: Speed is the distance travelled by a body in one unit of time. Its S.I. unit is metre per second (m/s).

Teacher's Note:
a) Common units are km/h and m/s.
b) Speed has magnitude only; it is a scalar.

14. Differentiate between uniform and non-uniform motion.

Answer:

Teacher's Note:
a) Both definitions must mention "equal intervals of time".
b) The distance-time graph of uniform motion is a straight line.

15. A train covers a distance of 560 Km in 8 hours. Find its speed.

Answer:
1. Distance = 560 km, Time = 8 h
2. Speed = Distance ÷ Time
3. Speed = 560 ÷ 8 = 70 km/h

Teacher's Note:
a) Write the formula first, then substitute with units.
b) Answer in km/h because distance is in km and time in hours.

16. Find distance covered by an athlete in 25 seconds if he is running at a speed of 20 m/s.

Answer:
1. Speed = 20 m/s, Time = 25 s
2. Distance = Speed × Time
3. Distance = 20 × 25 = 500 m

Teacher's Note:
a) Distance = speed × time is the rearranged form of the speed formula.
b) Units match here: m/s times s gives m.

17. Plot a distance-time graph for the given data.

Answer:

The graph is a straight line through the origin, as drawn below (time is shown in minutes after 8.00 a.m., so 0 means 8.00 a.m. and 60 means 9.00 a.m.).

Teacher's Note:
a) Time goes on the x-axis and distance on the y-axis.
b) The straight line shows uniform motion at 7 km every 10 minutes, a speed of 42 km/h.
c) Choose a convenient scale and label both axes with units.

Question Bank
Biology

Q.1. Fill in the blanks:
a. Chlorophyll is a ______________coloured pigment.

Answer: green

Teacher's Note:
a) Chlorophyll gives leaves their green colour and traps sunlight for photosynthesis.

b. Algae and lichens live in a ____________ association.

Answer: symbiotic

Teacher's Note:
a) In a lichen, an alga and a fungus live together and help each other.

c. ____________ are the type of teeth used for grinding and chewing food.

Answer: Molars (premolars and molars)

Teacher's Note:
a) Incisors cut, canines tear, and molars grind food.

d. The process of formation of soil is called ______________.

Answer: weathering

Teacher's Note:
a) Rocks break down slowly by wind, water and temperature changes to form soil.

Q.2. Choose the correct answer:
a. Plants manufacture food in the form of:
i. Starch
ii. Fructose
iii. Glucose
iv. Sucrose

Answer: (iii) Glucose

Teacher's Note:
a) Glucose is made in photosynthesis and then stored as starch.
b) Do not choose starch, which is the stored form.

b. Soil in which insectivorous plants grow is deficient in:
i. Nitrogen
ii. Sulphur
iii. Phosphorous
iv. All of the above

Answer: (i) Nitrogen

Teacher's Note:
a) Insectivorous plants trap insects to get the nitrogen the soil lacks.

c. The largest gland in the human body is:
i. Pituitary gland
ii. Liver
iii. Pancreas
iv. Adrenal gland

Answer: (ii) Liver

Teacher's Note:
a) The liver also makes bile, which helps in digestion of fats.

d. In human alimentary canal undigested food is stored in:
i. Rectum
ii. Anus
iii. Small intestine
iv. Caecum

Answer: (i) Rectum

Teacher's Note:
a) The rectum stores undigested food (faeces) until it leaves through the anus.
b) The anus is only the exit opening.

Q.3. Define photosynthesis. Support your answer with a suitable word equation.

Answer:
1. Photosynthesis is the process by which green plants make their own food (glucose) from carbon dioxide and water in the presence of sunlight and chlorophyll, releasing oxygen.
2. Word equation: Carbon dioxide + Water → (sunlight, chlorophyll) Glucose + Oxygen

Teacher's Note:
a) Mention sunlight and chlorophyll as the conditions.
b) Oxygen is released as a by-product.
c) Write the conditions above the arrow of the equation.

Q.4. Give reasons for the following:
a. Cows can digest cellulose but humans cannot.

Answer:
1. Cows and other ruminants have a large rumen where food is stored after quick swallowing.
2. Bacteria in the rumen break down cellulose, so the cow can digest it, but humans do not have such bacteria or enzymes to digest cellulose.

Teacher's Note:
a) Cellulose is a plant carbohydrate, the main part of grass.
b) Ruminants chew the cud, which means they bring food back to the mouth to chew again.

b. Gardeners prefer soil with plenty of humus content.

Answer:
1. Humus is rich in nutrients that plants need for growth.
2. It holds water and makes the soil loose, so air and roots can spread easily.

Teacher's Note:
a) Humus is made of decayed plant and animal matter.
b) It improves soil fertility.

Q.5. a. Give one difference between clayey soil and sandy soil.

Answer:

Teacher's Note:
a) Clay has the finest particles of all soil types.
b) Water holding capacity and percolation rate are the usual points of difference.

b. Name one crop that grows best in loamy soil.

Answer: Wheat

Teacher's Note:
a) Loamy soil is a mixture of sand, clay and silt with humus, and suits wheat, cotton and gram.
b) One crop is enough; do not write a long list.

Q.6. Explain the saprotrophic mode of nutrition in fungi.

Answer:
1. Fungi cannot make their own food and live on dead and decaying organic matter such as bread and fallen leaves.
2. They release digestive juices over the dead matter and convert it into a solution.
3. They then absorb the nutrients from this solution, so the nutrition is called saprotrophic.

Teacher's Note:
a) Digestion is outside the body in this mode of nutrition.
b) Fungi act as decomposers and recycle nutrients in the soil.

Q.7. a. Observe the given diagram and label the parts A, B, C and D.

[Figure: Soil profile with plants growing at the top; four layers marked from top to bottom as A (dark topsoil), B (lighter subsoil layer with a few small stones), C (layer of broken rocks and pebbles) and D (solid bedrock of large rock blocks)]

Answer:
1. A - Topsoil (the top layer, rich in humus)
2. B - Subsoil (the layer of fine particles below the topsoil)
3. C - Weathered rock (broken rock pieces and pebbles)
4. D - Bedrock (solid hard rock)

Teacher's Note:
a) This is the soil profile showing horizons from top to bottom.
b) Plants have roots mainly in A.

b. In a given soil sample, it took 10 minutes for 200ml of water to percolate. Calculate the rate of percolation in your soil sample.

Answer:
1. Rate of percolation = Quantity of water ÷ Time taken
2. Rate of percolation = 200 ml ÷ 10 min = 20 ml/min

Teacher's Note:
a) Always give the unit, ml/min.
b) Sandy soil has a high rate of percolation and clayey soil a low rate.

Q.8. Complete the following table:

Answer:

Teacher's Note:
a) The pancreas and the wall of the small intestine also pour their juices into the small intestine, so the part of the canal is the same.
b) The liver does not make enzymes; bile only helps in fat digestion.
c) Small intestine is also the main site of absorption.

Q.9. a. Use of plastic bags should be banned completely. Why?

Answer:
1. Plastic is non-biodegradable and stays in the soil for hundreds of years, harming soil and plants.
2. Animals swallow plastic bags with food, which chokes them and can kill them.
3. Plastic bags block drains and cause flooding, and burning them gives out poisonous gases.

Teacher's Note:
a) Biodegradable means broken down by microbes.
b) Suggest alternatives such as cloth and jute bags.

b. Explain the mode of feeding and digestion in Amoeba. Support your answer with a well labelled diagram.

[Figure: diagram to be added: Amoeba engulfing food with pseudopodia, showing nucleus, cytoplasm, food vacuole, contractile vacuole and cell membrane]

Answer:
1. Amoeba is a single-celled organism with holozoic nutrition; it takes in solid food.
2. When food such as an algal cell is near, Amoeba puts out finger-like pseudopodia around it and engulfs it, forming a food vacuole.
3. Digestive enzymes enter the food vacuole and break the food down into simple, soluble substances.
4. The digested food is absorbed into the cytoplasm and gives energy; the undigested food is thrown out through the cell surface.
5. Labelled diagram: Amoeba with nucleus, cytoplasm, pseudopodia, food vacuole, contractile vacuole and cell membrane.

Teacher's Note:
a) Amoeba changes shape and has no fixed mouth.
b) Label pseudopodia, food vacuole and nucleus in the diagram.
c) Digestion is intracellular, inside the food vacuole.

QUESTION BANK FOR SECOND TERM
PHYSICS/CHEMISTRY

1. Give one word answer
a) Path of an electric current

Answer: Circuit

Teacher's Note:
a) A complete path is called a closed circuit.

b) A group of cells joined together.

Answer: Battery

Teacher's Note:
a) A battery is two or more cells connected together.

c) Magnet produced by electricity.

Answer: Electromagnet

Teacher's Note:
a) It works only while current flows through the coil.

d) A safety device that protects appliances.

Answer: Fuse

Teacher's Note:
a) A fuse melts and breaks the circuit when too much current flows.

2. Match the column
1. Electromagnet a) Indicates current
2. Insulator b) Hearing effect
3. Galvanometer c) Magnetic effect
4. Electric heater d) Temporary
5. Microphone e) Rubber

Answer:
1. Electromagnet - c) Magnetic effect
2. Insulator - e) Rubber
3. Galvanometer - a) Indicates current
4. Electric heater - d) Temporary
5. Microphone - b) Hearing effect

Teacher's Note:
a) The list has no "heating effect", so the heater is matched with "Temporary": it heats only while the current flows.
b) A microphone changes sound into electrical signals.

3. Differentiate between an open and a closed circuit with the help of diagrams.

Answer:

Teacher's Note:
a) Current flows only in a complete, unbroken path.
b) The switch is the part that opens and closes the circuit.

4. What is a fuse wire? What are the characteristics of the material used to make a fuse wire?

Answer:
1. A fuse wire is a thin wire placed in a circuit as a safety device; it melts and breaks the circuit if the current becomes too high.
2. The material has a low melting point, so it melts quickly when excess current flows.
3. It has a high resistance and is made of an alloy such as tin and lead, and it is thin so it heats up easily.

Teacher's Note:
a) A fuse protects appliances from damage by short circuit or overloading.
b) It is always connected in series with the appliance.
c) A fuse once melted must be replaced.

5. Describe a simple experiment to show that a wire carrying current has a magnetic field.

Answer:
1. Place a small magnetic compass on a table and let its needle settle in the north-south direction.
2. Hold a straight wire connected to a cell and a switch above and parallel to the needle.
3. Switch on the current; the needle gets deflected.
4. Switch off the current; the needle returns to its original position.
5. This shows that a current-carrying wire produces a magnetic field around it.

Teacher's Note:
a) This is Oersted's experiment.
b) Reversing the current direction reverses the direction of deflection.

6. Draw a labeled diagram and explain the working of an electric bell.

[Figure: diagram to be added: electric bell showing battery, switch, electromagnet (coil on soft iron core), soft iron armature with hammer, gong, contact screw and spring strip]

Answer:
1. An electric bell has an electromagnet, a soft iron armature with a hammer attached, a gong, a contact screw with a spring strip, a switch and a battery.
2. When the switch is pressed, current flows through the coil and the iron core becomes an electromagnet.
3. It attracts the armature, so the hammer strikes the gong and the bell rings.
4. When the armature moves, the circuit breaks at the contact screw, the electromagnet loses its magnetism and the spring pulls the armature back.
5. The circuit is complete again and the process repeats, so the bell rings continuously as long as the switch is pressed.

Teacher's Note:
a) Label the electromagnet, armature, hammer, gong, contact screw and battery in the diagram.
b) Remember: make-and-break of the circuit keeps the hammer moving.
c) Do not forget the spring strip, which restores the armature.

7. Define the following term:
a) Reflection

Answer: Reflection is the bouncing back of light rays when they fall on a polished surface such as a mirror.

Teacher's Note:
a) A mirror gives regular reflection because its surface is smooth.

b) Angle of incidence

Answer: It is the angle between the incident ray and the normal at the point of incidence.

Teacher's Note:
a) Both angles are measured from the normal and not from the surface.

c) Angle of reflection

Answer: It is the angle between the reflected ray and the normal at the point of incidence.

Teacher's Note:
a) By the law of reflection, the angle of incidence equals the angle of reflection.

8. Give one word answer
a) A line representing the direction of light.

Answer: Ray

Teacher's Note:
a) A bundle of rays is called a beam.

b) An image that cannot be put on screen.

Answer: Virtual image

Teacher's Note:
a) A plane mirror always forms a virtual image.

c) A piece of glass with one or both sides curved allows the light to pass through.

Answer: Lens

Teacher's Note:
a) A lens may be convex or concave.

QUESTION BANK
BIOLOGY

Q1. Fill in the blanks:
a) ____________ helps in the transport of glucose in plants.

Answer: Phloem

Teacher's Note:
a) Xylem carries water and minerals while phloem carries food.

b) ____________ is a component of blood which helps in formation of a clot.

Answer: Platelets

Teacher's Note:
a) Platelets stop bleeding by helping the blood to clot.

c) Circulation in _______________ takes place with the help of water.

Answer: Hydra (and sponges)

Teacher's Note:
a) Hydra has no blood; water entering its body carries food and oxygen to the cells.

d) ___________ and ____________ are eliminated during sweating.

Answer: Water and salts

Teacher's Note:
a) Sweat also contains a small amount of urea.

e) Insects have ___________ for breathing.

Answer: tracheae (tracheal tubes)

Teacher's Note:
a) Tracheae open to the outside through small holes called spiracles.

f) Anaerobic respiration of ____________ is used in wine and beer making industry.

Answer: yeast

Teacher's Note:
a) Yeast breaks down sugar without oxygen and gives alcohol and carbon dioxide.

g) The amount of nitrogen in inhaled and exhaled air is___________

Answer: the same (about 78 percent)

Teacher's Note:
a) The body does not use nitrogen, so its amount does not change.

h) Earthworms take in oxygen from their surroundings through____________.

Answer: their moist skin

Teacher's Note:
a) Gas exchange in earthworms takes place through a thin, moist skin.

Q2. Name of following :
a. Underground stem with buds

Answer: Rhizome

Teacher's Note:
a) Ginger and turmeric are rhizomes; buds on them grow into new plants.
b) A potato tuber is also an underground stem with buds called eyes.

b. Type of reproduction in algae

Answer: Fragmentation (asexual reproduction)

Teacher's Note:
a) Algae break into pieces and each piece grows into a new alga.

c. Male organs of a flower

Answer: Stamens

Teacher's Note:
a) Each stamen has an anther and a filament.

d. Fusion of male and female gamete.

Answer: Fertilisation

Teacher's Note:
a) The fertilised egg is called the zygote.

Q3. Differentiate between the following
a. Self and cross pollination

Answer:

Teacher's Note:
a) Cross pollination gives healthier seeds with variations.
b) Mention the same plant versus a different plant.

b. Asexual and sexual production

Answer:

Teacher's Note:
a) The question says "production" but means "reproduction".
b) Mention the number of parents first.

c. Wind and animal dispersed seed.

Answer:

Teacher's Note:
a) Structure is linked to the method of dispersal.
b) Give one example of each.

d. Arteries and Veins.

Answer:

Teacher's Note:
a) Pulmonary artery and pulmonary vein are exceptions to the oxygen rule.
b) Pulse can be felt in arteries but not in veins.

e. Inhalation and exhalation

Answer:

Teacher's Note:
a) Air moves in when the chest cavity expands.
b) Compare the diaphragm and the ribs; examiners look for both.

f. Anaerobic and aerobic respiration.

Answer:

Teacher's Note:
a) Oxygen is the key difference.
b) Energy released is far larger in aerobic respiration.

Q4. Explain the transport of water and minerals in plants

Answer:
1. Root hairs absorb water and minerals from the soil.
2. From the roots, water and minerals move up through xylem vessels, which form a continuous tube from the roots through the stem to the leaves.
3. Water evaporates from the leaves through stomata by transpiration; this creates a suction (transpiration pull).
4. The suction pulls water up the xylem from the roots to the leaves, and minerals dissolved in it reach every part of the plant.

Teacher's Note:
a) Name the tissue, xylem, and the process, transpiration pull.
b) Xylem carries water upwards only, while phloem carries food both ways.
c) A well-labelled flow from root hair to leaf earns full marks.

Q5. Explain the circulation of blood in the human body. Support your answer with a well labelled diagram.

[Figure: diagram to be added: human heart with right atrium, right ventricle, left atrium, left ventricle, aorta, vena cava, pulmonary artery and pulmonary vein, with arrows for flow of blood to the lungs and to the body]

Answer:
1. The heart pumps blood through blood vessels to all parts of the body, forming a closed circulatory system.
2. Oxygen-rich blood leaves the left ventricle through the aorta and passes into arteries, which divide into capillaries and supply oxygen and food to the body cells.
3. Oxygen-poor blood returns from the body through veins and the vena cava to the right atrium and then the right ventricle.
4. The right ventricle pumps it through the pulmonary artery to the lungs, where it picks up oxygen and gives out carbon dioxide.
5. The oxygen-rich blood returns through the pulmonary vein to the left atrium and passes to the left ventricle; the cycle repeats.

Teacher's Note:
a) The heart has four chambers: two atria and two ventricles.
b) Remember that the pulmonary artery carries oxygen-poor blood, a common trap.
c) Show the arrows in the diagram from heart to lungs and from heart to body.

Q6. Give reasons
a. Insects prove very beneficial to flowering plants.

Answer:
1. Insects visit flowers for nectar and carry pollen from one flower to another.
2. This helps in pollination, and so in the formation of seeds and fruits.

Teacher's Note:
a) Bright colour and sweet smell of flowers attract insects.
b) Bees and butterflies are common pollinators.

b. Only one plant of mint is required for a garden full of mint.

Answer:
1. Mint reproduces by vegetative propagation, in which new plants grow from the stems and roots of the parent plant.
2. A single plant therefore spreads and produces many new plants.

Teacher's Note:
a) Vegetative propagation needs no seeds or gametes.
b) Other examples are rose cutting and potato eyes.

c. Seeds must go far from the parent plants.

Answer:
1. If seeds fall near the parent plant, they compete for sunlight, water and minerals.
2. Dispersal to faraway places gives them space and helps the species to spread to new areas.

Teacher's Note:
a) Dispersal is by wind, water, animals and bursting of fruits.
b) It also reduces competition among seedlings.

Q7. Explain how the roots of the plants also show respiration. Support your answer with a suitable diagram.

[Figure: diagram to be added: plant with roots in soil showing air spaces between soil particles, with arrows for oxygen entering the roots and carbon dioxide leaving them]

Answer:
1. Roots need oxygen for respiration to get energy for growth and for absorbing water and minerals.
2. They take in the oxygen present in the air spaces between the soil particles.
3. They give out carbon dioxide during respiration.
4. If soil is flooded with water, the air spaces are filled and the roots cannot get oxygen, so plants may die.
5. Experiment: a germinating seedling with its roots in an airtight flask shows a limewater test for carbon dioxide produced by roots.

Teacher's Note:
a) Roots respire even though they are underground.
b) Waterlogged soil is harmful because it cuts off oxygen.
c) Labelling air spaces in the soil diagram is important.

Q8. Draw the diagram of a human respiratory system and label the following in the diagram:
a) Trachea
b) Lungs
c) Alveoli
d) Diaphragm

[Figure: diagram to be added: human respiratory system with nasal cavity, trachea, bronchi, two lungs, alveoli and diaphragm labelled]

Answer:
1. The diagram shows the nostrils and nasal cavity, the pharynx, the windpipe (trachea) dividing into two bronchi, one for each lung.
2. Each bronchus divides into smaller bronchioles ending in tiny air sacs, the alveoli, inside the lungs.
3. Below the lungs is the dome-shaped muscular diaphragm; the ribs enclose the lungs.
4. Labels: Trachea, Lungs, Alveoli and Diaphragm.

Teacher's Note:
a) Draw the trachea with C-shaped rings of cartilage.
b) Alveoli are drawn as grape-like clusters at the end of bronchioles.

Q9. Draw the following
a) Pistil

Answer: The pistil has three parts: the stigma at the top, the style (a thin tube) and the ovary at the base containing ovules. [Figure: diagram to be added - pistil with stigma, style, ovary and ovules labelled]

Teacher's Note:
a) The pistil is the female part of the flower.
b) Label stigma, style and ovary.

b) Stamen

Answer: The stamen has an anther at the top (which produces pollen grains) joined to a thin stalk called the filament. [Figure: diagram to be added - stamen with anther and filament labelled]

Teacher's Note:
a) The stamen is the male part of the flower.
b) Show the anther as a two-lobed structure.

c) Human excretory system

Answer: The human excretory system has two bean-shaped kidneys, two ureters, a urinary bladder and a urethra; the kidneys filter blood and make urine, which passes through the ureters to the bladder and is expelled through the urethra. [Figure: diagram to be added - human excretory system with kidneys, ureters, urinary bladder and urethra labelled]

Teacher's Note:
a) Kidneys sit at the back of the abdomen.
b) Label the ureters connecting the kidneys to the bladder.

Holiday Home Work
Physics

"Ashes were already falling, not as yet very thickly. I looked round: a dense black cloud was coming up behind us, spreading over the earth like a flood. 'Let us leave the road while we can still see,' I said, or we shall be knocked down and trampled underfoot in the dark by the crowd behind." - Written by 18 year old to a friend after seeing Mt. Vesuvius erupt on August 24, 79 AD.

Dear Students of Grade 7,
It could be any of us in place of this kid, who was an eye witness to a volcanic eruption. We hear about natural disasters striking Mother Earth without any obvious warnings. Giving a serious thought to natural disasters that can completely turn our lives topsyturvy, we want you to choose any one natural disaster from the following list and work on a special project demonstrating what you have learnt, in a fun and interesting way.
- Floods
- Cyclonic Storms

PHYSICS PROJECT

Prepare a Handwritten Information booklet consisting of 8 pages (Use A-4 sheets) highlighting pagewise, the following information. The information should be very brief but relevant.
Page 1 - Name of the student:
Class and section:
Name of the Natural disaster chosen by you.

♦ Cyclonic Storms