Job code - 10 (12-7-2020)
3 times
Job code - 9 (11-7-2020)
5 times
Woollen clothes keep us warm in winter In the winter, we use woollen clothes.
Wool is a poor conductor of heat.
Moreover, there is air trapped in between
the wool fibres. This air prevents the flow of heat from our body to the cold surroundings. So, we feel warm.
Suppose you are given the choice in winter of using either one thick blanket or two thin blankets joined together.
What would you choose and why? Remember that there would be a layer of air in between the blankets.
Job code - 8 (9-7-2020)
5 times
The normal temperature of human body is 37°C. Note that the temperature is stated with its unit.
The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.
The materials which allow heat to pass through them easily are conductors of heat.
The materials which do not allow heat to pass through them easily are poor conductors of heat such as plastic and wood. Poor conductors are known as insulators.
Job code - 7 (8-7-2020)
5 times
FEEDING AND DIGESTION IN
AMOEBA
Amoeba is a microscopic single-celled organism found in pond water. Amoeba has a cell membrane, a rounded, dense
nucleus and many small bubble-like
vacuoles in its cytoplasm.
Amoeba constantly changes its shape
and position. It pushes out one, or
more finger-like projections, called
pseudopodia or false feet for movement and capture of food.
Amoeba feeds on some microscopic
organisms. When it senses food, it pushes out pseudopodia around the food particle and engulfs it. The food becomes trapped in a food vacuole.
Digestive juices are secreted into the food vacuole. They act on the food and break it down into simpler substances.
Gradually the digested food is absorbed.
The absorbed substances are used for growth, maintenance and multiplication. The undigested residue of the food is expelled outside by the vacuole.
Job code - 5 (5-7-2020)
10 times
Large intestine
The large intestine is wider and shorter
than small intestine. It is about 1.5 metre
in length. Its function is to absorb water
and some salts from the undigested food
material. The remaining waste passes
into the rectum and remains there as
semi-solid faeces. The faecal matter is
removed through the anus from
time-to-time. This is called egestion.
Job code - 5 (2-7-2020)
10 times
Absorption in the small intestine
The digested food can now pass into the blood vessels in the wall of the intestine.
This process is called absorption . The inner walls of the small intestine have thousands of finger-like outgrowths. These are called villi (singular villus).
The villi increase the surface area for absorption of the digested food. Each villus has a network of thin and small blood vessels close to its surface. The surface of the villi absorbs the digested food materials. The absorbed substances are transported via the blood vessels to different organs of the body where they are used to build complex substances such as the proteins required by the body. This is called assimilation . In the cells, glucose breaks down with the help of oxygen into carbon dioxide and water, and energy is released. The food that remains undigested and unabsorbed then enters into the large intestine.
Job code - 4 (1-7-2020)
10 times
The stomach
The stomach is a thick-walled bag. Its shape is like a flattened U and it is the widest part of the alimentary canal. It receives food from the food pipe at one end and opens into the small intestine
at the other.
The inner lining of the stomach secretes mucous, hydrochloric acid and digestive juices. The mucous protects the lining of the stomach. The acid kills many bacteria that enter along with the food and makes the medium in the stomach acidic. The digestive juices
break down the proteins into simpler substances.
The small intestine
The small intestine is highly coiled and is about 7.5 metres long. It receives secretions from the liver and the pancreas. Besides, its wall also secretes juices.
The liver is a reddish brown gland situated in the upper part of the abdomen on the right side. It is the largest gland in the body. It secretes bile juice juice that is stored in a sac called the
gall bladder . The bile plays an important role in the digestion of fats.
Job code - 3 (30-6-2020)
The mouth and buccal cavity
Food is taken into the body through the
mouth. The process of taking food into the body is called ingestion. We chew the food with the teeth and break it down mechanically into small pieces. Each tooth is rooted in a separate socket in the gums. Our teeth vary in appearance and perform different functions.
The foodpipe/oesophagus
The swallowed food passes into the foodpipe or oesophagus. The foodpipe runs along the neck and the chest. Food is pushed down by movement of the wall of the foodpipe.
Actually this movement takes place throughout the alimentary canal and pushes the food downwards.
Job code - 2 (29-6-2020)
10 times
The food passes through a continuous canal (below figure) which begins at the buccal cavity and ends at the anus. The canal can be
divided into various compartments: (1) the buccal cavity,
(2) foodpipe or oesophagus , (3) stomach (4) small intestine,
(5) large intestine ending in the rectum and (6) the anus. These parts together form the alimentary canal (digestive tract) ). The food components gradually get digested as food travels through the various compartments. The inner walls of the stomach and the small intestine, and the various glands such as salivary glands glands, the liver and the pancreas secrete digestive juices. The digestive juices convert complex substances of food into simpler ones. The digestive tract and the associated glands together constitute the digestive system .
Job code - 1
Today's work
5 times
Nutrition in Animals
3 times
Job code - 9 (11-7-2020)
5 times
Woollen clothes keep us warm in winter In the winter, we use woollen clothes.
Wool is a poor conductor of heat.
Moreover, there is air trapped in between
the wool fibres. This air prevents the flow of heat from our body to the cold surroundings. So, we feel warm.
Suppose you are given the choice in winter of using either one thick blanket or two thin blankets joined together.
What would you choose and why? Remember that there would be a layer of air in between the blankets.
Job code - 8 (9-7-2020)
5 times
The normal temperature of human body is 37°C. Note that the temperature is stated with its unit.
The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.
The materials which allow heat to pass through them easily are conductors of heat.
The materials which do not allow heat to pass through them easily are poor conductors of heat such as plastic and wood. Poor conductors are known as insulators.
Job code - 7 (8-7-2020)
5 times
Heat chapter
A reliable measure of the hotness of an object is its temperature temperature.
Temperature is measured by a device called thermometer.
MEASURING TEMPERATURE
The thermometer that measures our body
temperature is called a clinical thermometer.
Job code - 6 (6-7-2020)
10 timesFEEDING AND DIGESTION IN
AMOEBA
Amoeba is a microscopic single-celled organism found in pond water. Amoeba has a cell membrane, a rounded, dense
nucleus and many small bubble-like
vacuoles in its cytoplasm.
Amoeba constantly changes its shape
and position. It pushes out one, or
more finger-like projections, called
pseudopodia or false feet for movement and capture of food.
Amoeba feeds on some microscopic
organisms. When it senses food, it pushes out pseudopodia around the food particle and engulfs it. The food becomes trapped in a food vacuole.
Digestive juices are secreted into the food vacuole. They act on the food and break it down into simpler substances.
Gradually the digested food is absorbed.
The absorbed substances are used for growth, maintenance and multiplication. The undigested residue of the food is expelled outside by the vacuole.
Job code - 5 (5-7-2020)
10 times
Large intestine
The large intestine is wider and shorter
than small intestine. It is about 1.5 metre
in length. Its function is to absorb water
and some salts from the undigested food
material. The remaining waste passes
into the rectum and remains there as
semi-solid faeces. The faecal matter is
removed through the anus from
time-to-time. This is called egestion.
Job code - 5 (2-7-2020)
10 times
Absorption in the small intestine
The digested food can now pass into the blood vessels in the wall of the intestine.
This process is called absorption . The inner walls of the small intestine have thousands of finger-like outgrowths. These are called villi (singular villus).
The villi increase the surface area for absorption of the digested food. Each villus has a network of thin and small blood vessels close to its surface. The surface of the villi absorbs the digested food materials. The absorbed substances are transported via the blood vessels to different organs of the body where they are used to build complex substances such as the proteins required by the body. This is called assimilation . In the cells, glucose breaks down with the help of oxygen into carbon dioxide and water, and energy is released. The food that remains undigested and unabsorbed then enters into the large intestine.
Job code - 4 (1-7-2020)
10 times
The stomach
The stomach is a thick-walled bag. Its shape is like a flattened U and it is the widest part of the alimentary canal. It receives food from the food pipe at one end and opens into the small intestine
at the other.
The inner lining of the stomach secretes mucous, hydrochloric acid and digestive juices. The mucous protects the lining of the stomach. The acid kills many bacteria that enter along with the food and makes the medium in the stomach acidic. The digestive juices
break down the proteins into simpler substances.
The small intestine
The small intestine is highly coiled and is about 7.5 metres long. It receives secretions from the liver and the pancreas. Besides, its wall also secretes juices.
The liver is a reddish brown gland situated in the upper part of the abdomen on the right side. It is the largest gland in the body. It secretes bile juice juice that is stored in a sac called the
gall bladder . The bile plays an important role in the digestion of fats.
Job code - 3 (30-6-2020)
The mouth and buccal cavity
Food is taken into the body through the
mouth. The process of taking food into the body is called ingestion. We chew the food with the teeth and break it down mechanically into small pieces. Each tooth is rooted in a separate socket in the gums. Our teeth vary in appearance and perform different functions.
The foodpipe/oesophagus
The swallowed food passes into the foodpipe or oesophagus. The foodpipe runs along the neck and the chest. Food is pushed down by movement of the wall of the foodpipe.
Actually this movement takes place throughout the alimentary canal and pushes the food downwards.
Job code - 2 (29-6-2020)
10 times
The food passes through a continuous canal (below figure) which begins at the buccal cavity and ends at the anus. The canal can be
divided into various compartments: (1) the buccal cavity,
(2) foodpipe or oesophagus , (3) stomach (4) small intestine,
(5) large intestine ending in the rectum and (6) the anus. These parts together form the alimentary canal (digestive tract) ). The food components gradually get digested as food travels through the various compartments. The inner walls of the stomach and the small intestine, and the various glands such as salivary glands glands, the liver and the pancreas secrete digestive juices. The digestive juices convert complex substances of food into simpler ones. The digestive tract and the associated glands together constitute the digestive system .
Job code - 1
Today's work
5 times
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