Queen Bee is responsible for laying eggs in a colony.
Drones main function is to fertilise the eggs produced by the queen.
Worker bees:
Their function is to collect honey, look after the young ones, clean the comb, defend the hive, and maintain the temperature of the bee hive.

i) The vector of malarial parasite is female Anopheles mosquito.
ii) Malaria is caused by Plasmodium falciparum is malignant and fatal.

Any feature of an organism or its part that enables it to exist under conditions of its habitat is called adaptation.

1. The earth is the only planet in the solar system which supports life .
2. Due to its right distance from the sun, it has the right temperature, the presence of water and suitable atmosphere and a blanket of ozone.
3. All these factors have made continuation of life possible on the Earth.

The number of vibrations (complete waves or cycles) produced in one second is called frequency. Its SI unit is hertz.

The layer of the air around the earth upto certain height of about 300 km, is called as the atmosphere of the earth. Since air occupies space and has weight, it also exerts pressure. This pressure is called atmospheric pressure.

a) Both assertion and reason are true and reason is the correct explanation of assertion.

a) Both assertion and reason are true and reason is the correct explanation of assertion.

Time taken by a satellite to complete one revolution round the earth is called time period.
Time period T = \(\frac { Distances covered }{ Orbital velocity }\)

The horizontal velocity that has to be imparted to a satellite at the determined height, so that it makes a circular orbit around the planet is called orbital velocity.

Treatment of certain diseases by destroying the invading organism without damaging the cells of the host, by the use of certain organic compounds is known as Chemotherapy. It is widely used for treating cancer.

Velocity of sound = 340 ms^-1
Height of tower = 750 m
Total distance travelled = 2 x 750: 1500 m
\(Valocity=\frac {distance}{time}\) 
\(340=\frac {1500}{time}\) 
\(time=\frac {1500}{340}=4.4s\)
After 4.4 s, the splash is heard.

Density of water (p) = 1000 km/m3
Volume of block (v) = 300 cm³ = 300 x 10^-6 m³
Gravitational force (g) = 10 ms^-2
Up thrust = pgv
= 1000 x 10 x 300 x 10^-6
= 3000000 x 10^-6 (10^-6 = 1000000)
\(\frac{3000000}{1000000}\)
Upthrust due to water = 3N

No we can't recharge the batteries used in watches, because they are primary cells. The primary cells can't be recharged again. So it is be not possible to recharge them again.

The fish maintains buoyancy. Fishes have the ability to make themselves lighter to float up or heavier to sink down by using its swim bladder. The swim bladder is filled with air it will float.

Biologically degradable organic wastes are used as potential organic resources for vermicomposting.
1. Agricultural waste such as crop residue, vegetable waste, sugarcane trash.
2. Crop residues such as rice straw, tea wastes, cereal and pulse residues rice husk, tobacco wastes, coir wastes.
3. Leaf litter
4. Fruit and vegetable wastes.
5. Animal wastes - cattle dung, poultry droppings, pig slurry, goat and sheep dropping.
6. Biogas slurry.

The immunization schedule indicates the age at which the vaccine should be administered to protect the children from infectious diseases.

The water cycle involves a series of inter connected pathways involving both the biotic and abiotic components of the biosphere.
Water continuously moves between living organisms, such as plants and non-living things such as clouds, rivers and oceans.
The steps involved in the water cycle are as follows,
1. Evaporation:
Water evaporates from the surface of the earth and water bodies such as the oceans, seas, lakes, ponds and rivers turn into water vapour.
2. Sublimation:
Ice sheets and ice caps from north and south poles and ice caps on mountains, get converted into water vapour directly, without converting into liquid.
3. Transpiration:
It is the process by which plants release water vapour into the atmosphere through stomata in leaves and stems.
4. Condensation:
At higher altitudes, the temperature is low the water vapour present there condenses to form very tiny particles of water droplets. These particles come close together to form clouds and fog.
5. Precipitation:
Due to change in wind or temperature, clouds combine to make bigger droplets, and pour down as precipitation (rain). It includes drizzle, rain, snow and hail.
6. Run off:
As the water pours down, it runs over the surface of earth. Runoff water combines to form channels, rivers, lakes and ends up into seas and oceans.
7.Infiltration:
Some of the precipitated water moves deep into the soil, then it moves down and increases the ground water level.
8. Percolation:
Some of the precipitated water flows through soil and porous or fractured rock.

Supporting Water - Purification Efforts:
1. Using the technology developed for the ISS, areas having water scarcity can gain access to advanced water filtration and purification systems.
2. This could very well be a life - saving difference for the people in such hazardous locations.
3. The water recovery system (WRS) and the oxygen generation system (OGS) developed for the ISS have saved a village in Iraq from being deserted due to lack of clean water.
Eye tracking technology:
1. The Eye tracking device, built for a microgravity experiment has proved ideal to be used in many laser surgeries.
2. This device tracks the eyes position very accurately without interfering with the surgeon's work.
3.Eye tracking technology is helping disabled people with limited movement and speech.
Robotic arms and Surgeries:
1. Robotic arms developed for research in ISS are providing significant help to the surgeons in removing inoperable tumours and taking biopsies with great accuracies.
2. Robotic arms do heavy lifting in Cancer treatment in the form of surgical robots.
3. ISS technology are useful in the development of improved vaccines, breast cancer detection and treatment, ultrasound machines for remote regions etc.

1. Sound from the surroundings is collected by the outer ear, called as 'pinna' .
2. The collected sound passes through the auditory canal.
3. At the end of the ear is eardrum or tympanic membrane.
4. When a compression of the medium reaches the eardrum the pressure on the outside of the membrane increases and forces the eardrum inward.
5. Similarly the eardrum moves outward when a rarefaction reaches it.
6. In this way the eardrum vibrates .
7. The vibrations are amplified several times by three bones called as the hammer, anvil and stirrup in the middle ear.
8. The middle ear transmits the amplified pressure variations received from the sound wave to the inner ear.
9. In the inner ear the pressure variations are turned into electrical signals by 'cochlea'
10. These electrical signals are sent to the brain via the auditory nerve and the brain interrupts them as sound.

Oxidation: (Reaction with oxygen)
Carbon combines with oxygen to form its oxides like carbon monoxide (CO) and carbondioxide (CO₂) with evolution of heat.
Organic carbon compounds like hydrocarbon also undergo oxidation to form oxides and steam with evolution of heat and flame. This is otherwise called combustion.
2C_(s)+ O_2(g) ➝ 2CO_(g) + heat
C_(s)+ O_2(g) ➝ CO_2(g) + heat
CH_4(s)+ 2O_2(g) ➝ CO_2(g) + 2H₂O_(g) + heat
Reaction with steam:
Carbon reacts with steam to form carbon monoxide and hydrogen. This mixture is called water gas.
C_(s) + H₂O_(g) ➝ CO_(g) + H_2(g)
Reaction with sulphur:
With sulphur, carbon forms its disulphide at high temperature
C_(s) + S_(g) ➝ CS_2(g)
Reaction with metals :
At elevated temperatures, carbon reacts with some metals like iron, tungsten, Titanium, etc to form their carbides. Tungesten+Carbon➝Tungsten carbide
W + C ➝ WC