1. Why are frogs said to be amphibians?
2. How does locomotion take place in star fish?
3. Mention the most abundant muscular tissue found in our body. State
its function.
4. Differentiate phototropism from photonasty.
5. Mention any two vital functions of human kidney.
6. Why salt is used as preservatives in food?
7. What are the effects of consuming adulterated food.
Answers
Answer:
1) The word "amphibian" comes from a Greek word that means "both lives." This is because frogs start their lives in the water and then live on land, according to Defenders of Wildlife...
2) Locomotion: Sea stars move using a water vascular system. Water comes into the system via the madreporite. It is then circulated from the stone canal to the ring canal and into the radial canals. The radial canals carry water to the ampullae and provide suction to the tube feet...
3) Skeletal muscle tissue is attached to bones by tendons. It allows voluntary body movements. Skeletal muscle is the most common type of muscle tissue in the human body....
4) Phototropism is directional movement while photonasty is non-directional movement. ... Phototropism is associated with growth while photonasty is not associatiated with growth. Phototropism is caused by cell divisions while photonasty is caused by changes in turgor. Phototropism is slow action while photonasty is fast.....
5) Two vital functions of the kidneys are;
1. Maintain the fluid and electrolyte balance in our body.
2. Maintain the osmotic pressure in blood and tissues...
6) Salt is effective as a preservative because it reduces the water activity of foods. The water activity of a food is the amount of unbound water available for microbial growth and chemical reactions. ... For example, a food might be protected by a combination of salt, refrigeration, pH, and a chemical preservative...
7) Adulterated food is dangerous because it may be toxic and can affect health and it could deprive nutrients essential for proper growth and development of a human being. The worst part is some adulterated food even causes cancer, the most life threatening disease...
Explanation: