Question

[ STANDARD 7 ]
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1. Why do organisms take food?

2. How would you test the presence of starch in leaves?

3. State the digestive organs of human?

4. Explain the structure of stomach?

5. How are selection of sheep’s done to obtain good quality wool?​

Answer 1

1. Organisms need to take food to get energy and perform life processes. ... To perform all these life processes, the organism needs energy and nutrients.
2. The presence of starch in leaves can be tested by Iodine test. When we remove chlorophyll from leaf by boiling it in alcohol and then put 2 drops of iodine solution, its colour change to blue indicates the presence of starch.
3. The hollow organs that make up the GI tract are the mouth, esophagus, stomach, small intestine, large intestine, and anus. The liver, pancreas, and gallbladder are the solid organs of the digestive system. The small intestine has three parts. The first part is called the duodenum.
4. stomach is a muscular organ located on the left side of the upper abdomen. The stomach receives food from the esophagus. As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter. The stomach secretes acid and enzymes that digest food.
5. Certain breeds of sheep have a thick coat of hair on their body which yields good quality wool in large quantities. The breeding of sheep is done to obtain such breeds of sheep which yield good quality wool in large quantities. This raises the quality and quantity of wool produced.

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