Question
Explain tooth decay?
✓
Answer
Our mouth contains some useful bacteria but if we do not clean our teeth and mouth after eating, many harmful bacteria also begin to live and grow in it. These bacteria break down the sugars present from the leftover food and release acids. These acids gradually damage the teeth and causes tooth decay.
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Complete the following table.
| S.No. | Feature | Photosynthesis | Respiration |
| 1. | Raw materials | ||
| 2. | Products | ||
| 3. | Word equation | ||
| 4. | Importance |
What are the components of blood$?$
→Three students start running from the starting point at the same time. The picture shows the position of the students on the path after a minute.
Which student ran the fastest? Explain your answer.
Which student ran the fastest? Explain your answer.
Frogs are amphibians. They survive on land and water, do they have any respiratory issue? How does frog breathe when they are in water? Do they possess lungs? Explain the role of lungs in frogs.
Rohan was very happy that there was his birthday. He was decorating the room by blowing balloons. He was wondered that most of his balloons burstd. He rushed to his father and asked the reason. His father smiled and explained.
- Can you explain the region that why his balloons get burst?
- What can be conclude from the condition mentioned?
- What are the values shown by Rohan?
Given below as Figure, is the distance-time graph of the motion an object.
→
- What will be the position of the object at $20s$?
- What will be the distance travelled by the object in $12s$?
- What is the average speed of the object?
Steps for the production of silk are given below in a jumbled order. Arrange them in their proper sequence:
→- Eggs are warmed to a suitable temperature for the larvae to hatch from eggs.
- Fibers are taken out from the cocoon.
- After $25$ to $30$ days, the caterpillars stop eating and start spinning cocoons.
- The $\frac{\text{larvae}}{\text{caterpillars}}$ or silkworms are kept in clean trays along with freshly chopped mulberry leaves.
- Female silk moths lay eggs.
- Cocoons are kept under the sun or boiled in water.
Outline your role as an active citizen in relation to sanitation.
Oxygen which is essential for the survival of all organisms is produced during photosynthesis. In the absence of photosynthesis, life would be impossible on the earth. During photosynthesis, chlorophyll containing cells of leaves, in the presence of sunlight, use carbon dioxide and water to synthesise carbohydrates. During the process oxygen is released. The presence of starch in leaves indicates the occurrence of photosynthesis. Starch is also a carbohydrate.
Q.1. Which component is essential for the survival of all the living organisms?
(a) Oxygen$\quad$(b) Carbon dioxide$\quad$(c) Carbon Monoxide$\quad$(d) Hydrogen
Q.2. Name the green pigment present in leaves.
Q.3. How we come to know the occurrence of photosynthesis in a plant?
→Q.1. Which component is essential for the survival of all the living organisms?
(a) Oxygen$\quad$(b) Carbon dioxide$\quad$(c) Carbon Monoxide$\quad$(d) Hydrogen
Q.2. Name the green pigment present in leaves.
Q.3. How we come to know the occurrence of photosynthesis in a plant?
State the advantages of vegetative reproduction?