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Mnemonics: Life Processes in Animals | Science Olympiad Class 7 PDF Download
| Table of contents |
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| Parts/Pathway of Digestive System |
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| Digestive Juices |
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| Ruminant Digestion Process |
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| Parts of the Respiratory System |
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| Mechanism of Breathing |
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Parts/Pathway of Digestive System
Mnemonic: "My Food Stays Super Long"
My – Mouth
Food – Food pipe (Oesophagus)
Stays – Stomach
Super – Small intestine
Long – Large intestine
Mnemonic Explanation: Food passes through the mouth, where digestion begins, then moves through the food pipe to the stomach. It continues to the small intestine for nutrient absorption and ends in the large intestine, where water is absorbed and waste is removed.
Digestive Juices
Mnemonic: " Some Healthy People Bite Slow"
- Some - Saliva
- Healthy- HCl
- People – Pancreatic juice
- Bite – Bile
- Slow – Small Intestine Juice
Mnemonic Explanation :
Ruminant Digestion Process
Mnemonic: "Swallow, Store, Return, Re-chew"
- Swallow – Swallow food
- Store – Store in the rumen
- Return – Return to mouth
- Re-Chew – Re-chew (Rumination)
Mnemonic Explanation: Ruminants like cows first swallow grass, store it in the rumen, then return it to the mouth to re-chew it thoroughly. This helps break down tough plant material for better digestion.
Parts of the Respiratory System
Mnemonic: "Nice Nose Takes Long Adventure"
- Nice – Nostrils
- Nose – Nasal Passage
- Takes– Trachea (Windpipe)
- Long – Lungs
- Adventure – Alveoli
Mnemonic Explanation: Air enters through the nostrils, travels via nasal passages and trachea, reaches the lungs, and ends at tiny sacs called alveoli, where gas exchange (oxygen and carbon dioxide) takes place.
Mechanism of Breathing
Mnemonic: "In Down....Out Up" : Pair of Opposites
- In – Inhale
- Down – Diaphragm moves down
- Out – Exhale
- Up – Diaphragm moves up
Mnemonic Explanation: During inhalation, the diaphragm moves down, creating space for air to enter. During exhalation, it moves up, pushing air out of the lungs.
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FAQs on Mnemonics: Life Processes in Animals - Science Olympiad Class 7
| 1. What are the main parts of the digestive system and their functions? |  |
Ans. The main parts of the digestive system include the mouth, esophagus, stomach, small intestine, large intestine, rectum, and anus. The mouth begins the digestion process by mechanically breaking down food and mixing it with saliva. The esophagus transports food to the stomach, where it is mixed with digestive juices and broken down further. The small intestine is where most nutrient absorption occurs, while the large intestine absorbs water and forms waste. The rectum stores waste until it is expelled through the anus.
| 2. What are digestive juices, and what role do they play in digestion? | |
Ans. Digestive juices are fluids produced by the digestive organs that help break down food. Key digestive juices include saliva, gastric juice (which contains hydrochloric acid and pepsin), bile, and pancreatic juice. Saliva begins the digestion of carbohydrates, gastric juice aids in protein digestion, bile emulsifies fats, and pancreatic juice contains enzymes that break down carbohydrates, proteins, and fats in the small intestine.
| 3. How does ruminant digestion differ from that of non-ruminants? | |
Ans. Ruminant digestion involves a unique process where animals like cows and sheep have a specialized stomach divided into four chambers: the rumen, reticulum, omasum, and abomasum. They first chew their food and swallow it into the rumen, where it ferments. They then regurgitate this semi-digested food (cud) to chew it again. In contrast, non-ruminants, like humans, have a single-chambered stomach and do not regurgitate their food.
| 4. What are the main parts of the respiratory system? | |
Ans. The main parts of the respiratory system include the nose, pharynx, larynx, trachea, bronchi, bronchioles, and lungs. The nose filters, warms, and moistens air. The pharynx serves as a passageway for air and food, while the larynx contains the vocal cords. The trachea branches into the bronchi, which lead to the lungs, where gas exchange occurs in the alveoli.
| 5. What is the mechanism of breathing, and how does it work? | |
Ans. The mechanism of breathing involves two main processes: inhalation and exhalation. During inhalation, the diaphragm contracts and moves downward, and the rib cage expands, creating a vacuum that draws air into the lungs. During exhalation, the diaphragm relaxes, and the rib cage contracts, pushing air out of the lungs. This process is essential for delivering oxygen to the body and removing carbon dioxide.
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