12 Which of the following natural cyclesdirectlyinvolves the sun? I. Carbon cycle Water cycle III. Nitrogen cycle C. Ionly I and II only 1. II and III II and III only 23. When a stick is dipped into a pool of water, it appears to A. bend towards the surface. bend away from the surface. C. be longer than its length. D. be seen straight in the water. 24. The building block of a material with the smallest unit of matter that retains the properties of an element is A. an ion. an atom. C. a proton. D. a molecule. is Digestion of rice in humans starts from the A. colon. B. gullet. C. stomach. D. mouth 26. A mother took her child to the hospital and upon investigation, it was noticed that the child's diet was lacking in zinC. What could this result in? L Decreased growth in the child IL Anaemia and constipation III. Inability of the body to fight infection A. I and II only I and III only C. 1. II and II D. II and III only 27. In making ornaments and jewellery, non-reactive metals are preferred because they A. are corrosive. are attractive. C. do not react with atmospheric oxygen. D. do not retain their lustre. 28. A metallic laddle was left in a boiling soup. After sometime, the handle became bot. This is because the particles in the laddle A. circulate as a result of the temperature differences. B. contain free electrons which are able to transfer heat energy. C. undergo rapid, random motion. D. are separated by large distances.

Question

12 Which of the following natural cyclesdirectlyinvolves the sun? I. Carbon cycle Water cycle III. Nitrogen cycle C. Ionly I and II only 1. II and III II and III only 23. When a stick is dipped into a pool of water, it appears to A. bend towards the surface. bend away from the surface. C. be longer than its length. D. be seen straight in the water. 24. The building block of a material with the smallest unit of matter that retains the properties of an element is A. an ion. an atom. C. a proton. D. a molecule. is Digestion of rice in humans starts from the A. colon. B. gullet. C. stomach. D. mouth 26. A mother took her child to the hospital and upon investigation, it was noticed that the child's diet was lacking in zinC. What could this result in? L Decreased growth in the child IL Anaemia and constipation III. Inability of the body to fight infection A. I and II only I and III only C. 1. II and II D. II and III only 27. In making ornaments and jewellery, non-reactive metals are preferred because they A. are corrosive. are attractive. C. do not react with atmospheric oxygen. D. do not retain their lustre. 28. A metallic laddle was left in a boiling soup. After sometime, the handle became bot. This is because the particles in the laddle A. circulate as a result of the temperature differences. B. contain free electrons which are able to transfer heat energy. C. undergo rapid, random motion. D. are separated by large distances.

Answer 1

### 22. C. I, II and III### 23. A. bend towards the surface.### 24. B. an atom.### 25. D. mouth### 26. B. I and III only### 27. C. do not react with atmospheric oxygen.### 28. B. contain free electrons which are able to transfer heat energy.

Answer 2

## Step1: Identify the natural cycles involving the sun### The sun directly influences the water cycle, carbon cycle, and nitrogen cycle through processes like evaporation, photosynthesis, and nitrogen fixation.## Step2: Analyze the optical phenomenon of a stick in water### Refraction causes the stick to appear bent towards the surface when dipped in water.## Step3: Define the smallest unit of matter retaining element properties### An atom is the smallest unit of matter that retains the properties of an element.## Step4: Determine the starting point of rice digestion in humans### Digestion of rice begins in the mouth where salivary amylase breaks down starch.## Step5: Assess the effects of zinc deficiency in a child's diet### Zinc deficiency can lead to decreased growth and inability to fight infection.## Step6: Reason for using non-reactive metals in jewelry### Non-reactive metals are preferred in jewelry because they do not react with atmospheric oxygen and retain their lustre.## Step7: Explain why a metallic ladle handle becomes hot### The handle becomes hot due to free electrons in the metal transferring heat energy.

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