The water holding capacity is the highest in clayey soil

(a) Part of electricity supplied produced heating effect.
(b) Electricity produces two effects:
(i) Heating effect.
(ii) Magnetic effect.
(c)The electricity supplied is mostly used to produce light and heating effect is minimum.

During photosynthesis, the plants intake carbon dioxide and water in the presence of chlorophyll and sunlight to form two new substances, i.e. glucose (food) and oxygen gas. So, photosynthesis is a chemical change.

The various parts of human excretory system are as follows

(i) Fruits
(ii) Vegetables
(iii) Medicines
(iv) Oxygen
(v) Cereals

The finger-like projections called villi are present in the inner walls of the small intestine. The villi increase the surface area. The large surface area of small intestine helps in the rapid absorption of the digested food.

(i) Forests give oxygen to keep us alive.
(ii) Forests absorb carbon dioxide, a gas which in excess in atmosphere contribute to climatic changes.
(iii) Forests provide us wood, gum, medicinal plants and many more things.
(iv) Forests save the soil from erosion.
(v) Forests help in maintaining the ground water level.

(a) When the object is far away the image is real, inverted and smaller in size.

(b) When the object is between F and radius lens, the image is real, inverted but bigger in size.

(c) When the object is near to the lens. The image is real, inverted and much bigger (magnified).

(a) The following precautionary measures while checking the fever through a clinical thermometer are
(i) While reading the clinical thermometer, it should never be held by the bulb.
(ii) The clinical thermometer should be washed properly (before and after use).
(b) The values showed by the elder brother of Pankaj, Vishwas, are concern towards the way of using the clinical thermometer and the importance of money as well.

(a) The plants do not possess any respiratory system still plants respire. The various parts of the plants like leaves, roots, etc., carry out respiration independently.
These parts take in oxygen from air in different manner and utilise it to obtain energy and give out CO₂, The leaves of plants possess tiny pores on their surface which is called as stomata. The gaseous exchange during respiration takes place through their stomata.
(b) Roots of the plants respire under the ground. Root cells get oxygen from the air present in the space between the soil particles.
There are several root hairs present on the roots of a plant.
The oxygen from the air (between soil particle) diffuses into root hair and reaches to the cells of the roots. This oxygen is utilised for respiration.

Raw soil differs from baked soil. The raw soil is white or dull blackish coloured soil. It contains water and air in it and can be moulded.
Baked soil is the heated raw soil which lost its water molecule due to heating and becomes red. Once the soil gets heated, it cannot be moulded into other form. Clay soil is used for making matkas, toys, pots, etc. The soil is kneaded along with horse dung to make best quality of raw clay soil. This kneaded soil is then placed on the wheel and appropriate shape is given. The final shape of the material is given with hands. The pots and matkas are then kept for drying for three days. These items are baked at high temperature after drying in air and then coloured.

The nature of any soil depends upon the rocks from which it has been formed and the type of vegetation that grows on it.

Food is pushed into the stomach by the peristaltic movement of the walls of oesophagus. Sometimes the food is not accepted by stomach and then the walls of food pipe move the food in opposite directions and food comes out as vomiting.

Oxyhaemoglobin.

If one half of a convex lens is covered with a black paper, then yes, the convex lens will produce the complete image of the object.

Treatment of wastewater involves physical, chemical and biological processes for removing different types of contaminants.