Aadya Isai

Plants use water in photosynthesis, the process that makes their food. Inside the leaves, sunlight gives energy to split water into hydrogen and oxygen. The hydrogen combines with carbon dioxide from the air to form glucose—the plant’s food. The oxygen is released into the air. So, without water, plants cannot make energy or grow.

Water also transports minerals and nutrients. The roots absorb water from the soil, and the minerals in the soil dissolve in it. This mixture travels through tiny tubes called xylem all the way up to the leaves. The movement happens because water naturally moves from areas of more water (in the soil) to areas of less water (inside the plant).

Another vital job of water is to keep the plant firm and upright. Each cell in a plant holds water that presses against its walls. This pressure, called turgor pressure, keeps stems and leaves stiff. If…

Sometimes we want high pressure and sometimes we want low pressure. Here is how high and low pressure help us.

How does pressure increases/ decrease and why?

Pressure increases when the force becomes stronger or the area becomes smaller, because that changes how the force spreads across a surface. When you increase the force, you’re pushing harder, so each part of the surface feels more force. When you decrease the area, the same force is concentrated in a smaller space, which also increases pressure.

For example, if you press a balloon on one nail, it bursts easily because all your force is acting on the tiny tip of the nail—small area means high pressure. But if you press the balloon on a bed of nails, it doesn’t burst, because your force spreads over many nails, making the total area larger and the pressure lower.

Pressure decreases when the force becomes…

Definition

Pressure is the amount of force exerted per unit area on a surface. It tells us how concentrated a force is — whether it’s spread out or focused on a small point.

Formula:

Pressure = Force /Area

• Force (F) is measured in Newtons (N).

• Area (A) is measured in square meters (m²).

Farmers and gardeners often add fertilisers to the soil where their crops are growing. The fertilizers provide mineral salts, which make the plants grow larger and healthier. Although fertilisers are expensive, the cost to farmers is outweighed by the extra money they can get for their crop.

What are fertilisers?

Fertilizers are any material of natural or synthetic origin that’s is applied to soil or to plant tissues to supply plant nutrients.

Or in other words - A chemical or natural substance added to soul or land to increase its fertility.

What are the benefits of fertilizers?

It supplies key nutrients to plants, such as nitrogen - N, phosphorus- P, and potassium - P (These may lag in the natural soil).