Class 7 Science Worksheets for Chapter 2
FAQs on CBSE Class 7 Science Nutrition in Animals Worksheets
1. Analyze the digestion and absorption processes in the small intestine.
The processes are as follows:
Digestion- In the small intestine, digestion is accomplished by bile juice, a digestive juice secreted by the liver, which breaks down large fat pieces into smaller ones. It does not contain any enzymes. The pancreatic juice secreted by the pancreas contains enzymes that help the body digest carbohydrates, proteins, and lipids. Pancreatic amylase helps digest carbohydrates while trypsin helps digest proteins. Through the action of digestive enzymes, carbohydrates, proteins, and lipids are eventually broken down into their simplest components such as glucose, amino acids, fatty acids, and glycerol.
Absorption- Food is absorbed through the walls of the intestine, which are lined with finger-like projections called villi. These villi increase the surface area available for nutrition absorption, and the blood vessels in the villi permit the absorption of digestion directly.
2. Explain digestion in ruminants briefly.
In ruminants, digestion begins the moment they chew and swallow their food. Ruminants do not completely chew the food they consume but gulp down as much as they can before swallowing. This is an adaptation so they don't have to spend as much time chewing their food. First, the rumen and reticulum soften the ingestions and after that produce the cellulase enzymes necessary for digesting the plant matter. Once the plant fibers have been broken down, digestion begins in the intestines.
While both amoeba and human beings are living organisms, they exhibit a few differences and similarities. Here are the similarities and differences:
Similarity
As living organisms, amoebae and humans contain the same macromolecules, proteins, and cells.
Amoebae and humans both have a heterotrophic type of nutrition.
Difference
Amoebas have a simple way of engulfing food and keeping it within their food vacuoles, unlike humans who are complex in their nutrition process involving ingestion, digestion, and egestion.
As multicellular organisms, humans are not like amoebas, which are unicellular.
4. What are villi? What are their location and function?
In the small intestine, villi are the projections on the inner surface that are responsible for absorbing digested food. By increasing the surface area of the intestinal wall, they improve digestion.
Location
These projections are located on the inner surface of the small intestine.
Functions
Their role is to increase the surface area of the wall so that the digested food can be absorbed.
The projections absorb the protein molecules, which then helps in the transfer of those molecules to the remaining organs.
5. What is the function of premolars and molars? How many teeth are there in each jaw?
The functions are as follows:
Premolars
Known as bicuspids, these teeth have an oval shape with ridges, making them a good choice for crushing and grinding food into smaller pieces. The human tooth arch has eight premolars, two on either side.
Molars
Humans have 12 molars, six on each jaw. Four of those are wisdom teeth, also known as the third molar. They are the largest and strongest teeth. They have a large and flat biting surface, making them ideal for grinding food.
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