Well dark colours are good  heat because they are good absorbers of light well an object appears dark only when it absorbs all the light falling on it for eg suppose u have a blue pen well reason why u see pen as blue because it absorbs the wavelenghts of other colour light ( consisted in white light) and it reflects blue colour light hence we see the pen as blue
but in case of black body it absorbs all the light of different wavelength and nothing is reflected .
well not the question arises what happened to the absorbed light ? well we know that even light has got some energy and moment it is absorbed by a black body it doesnt dissappear it is transformed into another form of energy like it is retained within the body which in trurn raises the body temperature and some body radiate energy absorbed by light .
Hence a darker body is good absorber of light so as a result it is a good emmitor of heat

Simpler substances are the substances made up of only one kind of elements whereas complex substances are made up of two or more kinds of elements.

Ingestion – Ingestion refers to the intake of food. Ingestion takes place through Mouth.
Digestion – Digestion refers to the breakdown of ingested food into simpler forms. Teeth, Stomach, Small intestine and secretion from various glands help in Digestion.
Absorption – Absorption refers to the process in which digested food is absorbed into the body fluids (Blood & lymph). Small intestine plays a major role in Absorption .
Assimilation – Assimilation refers to the process in which absorbed food is transported to different cells of the body.
Egestion – Egestion refers to the process of removal of undigested food from the body. Large intestine plays a major role in Egestion

A strong acid is one that completely ionises in water to form a large amount of hydrogen ions whereas a weak acid only partially ionises in water and thus produces a small amount of hydrogen ions. HCl, H₂SO₄, HNO₃ are strong acids. CH₃COOH, H₂CO₃, H₂SO₃ are weak acids.

The fungal spores are generally present in the air and grow on article (e.g. pickles, leather shoes, clothes, etc.) that are left in hot and humid weather for a long time. During rainy season, they land on wet and warm things and begin to germinate and grow.

1. Incisors are present at the front of the mouth with a sharp biting surface. They are used for cutting food into small chewable pieces.
2. Canines are situated at the ‘corners’ of the dental arches. They have a sharp, pointed biting surface. Their function is to grip and tear food.
3. Premolars do not have a sharp biting surface like the incisors and canines. They instead have a flat biting surface having the function to tear and crush food.
4. Molars are the largest among all types. They have a large and flat biting surface. Their function is to chew, crush and grind food.

Conduction is the process of transfer of heat in a body from a hot end to the cold end without any actual movement of the molecules of material.
Conduction is a process in which heat is transferred from the hotter end of an object to its cooler end.
The condition required for conduction of heat is the temperature difference between the ends of material (rod or any other form). Also, for conduction between two bodies, the bodies need to be in contact, along with having a temperature difference of course.

Saprophytic mode:  The plants which exhibit saprotrophic mode of nutrition are called as saprotrophs. Saprotrophs are the plants that obtain their nutrition from dead and decaying organic matter. Saprotrophs secrete digestive juices onto dead and decaying matter to dissolve it and then absorb nutrients from it.

The sting of an ant contains formic acid which is acidic in nature and when it enters the skin it causes burning sensation. The calamine lotion contains zinc base which relieves the person if applied on the affected area

The temperature of any substance remain constant during the change of state because the heat energy supplied is used up in changing the state of matter  and also this heat is used for breaking of several bonds or attractive forces.This heat, which does not raise the temperature of the body, is called Laten heat.

The mouth is also called as the buccal cavity or the oral cavity. In the human digestive system, the mouth is the upper end or the beginning of the alimentary canal, which leads to the pharynx and to the oesophagus. In humans, both the mouth or the buccal cavity and the nasal cavity are separated by the palate.

The buccal cavity mainly comprises the primary organ of the digestive system including the teeth, tongue and salivary glands.

A design of a toilet in which humans excreta is treated by earthworms has been tested in India. It has been found to be a novel, low water-use toilet for safe processing of human waste. The operationg of the toilet is very simple and hygienic. The human excreta is completely converted to vermi cakes - a resource much needed for soil.

Saprotrophic Nutrition: The uptake of nutrients by organism from dead and decaying matter in the form of solution is called the saprotrophic nutrition. The organisms which use saprotrophic mode of nutrition are called saprotrophs. For example: fungi.

Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. It is a silvery-white, soft, non-magnetic and ductile metal.

Iodine is a chemical element with the symbol I and atomic number 53. It exists as a lustrous, purple-black non-metallic solid at standard conditions.It is employed in medicine to monitor thyroid gland functioning, to treat goitre and thyroid cancer, and to locate tumours of the brain and of the liver. It is also used in investigations to trace the course of compounds in metabolism. Several iodine compounds are used as contrast mediums in diagnostic radiology. In aqueous solution even minute amounts of iodine in the presence of starch produce a blue-black colour.

All the green plants are called autotrophs. This is due to the fact that the green plants make their own food from very simple substances like carbon dioxide and water that is present in the surroundings. They do this by the process of photosynthesis.

The process by which green plants use sunlight to make food from carbon dioxide and water is called photosynthesis. The synthesis of food in plants occurs in leaves due to the presence of green pigment called chlorophyll. It is responsible for the absorption of light energy from the sun. The solar energy is captured by the leaves and stored in the plant in the form of food.