Explanation

Explanation

Zygote is formed in the ovary after the fusion of male and female gametes during fertilization.

The ovary then develops into a fruit, and the zygote grows into an embryo.

Explanation

Desertification means وہ عمل جس سے صحرائی زمین صصرا بن جائے

Desertification refers to the process of fertile land becoming desert due to factors like drought, deforestation, or improper agricultural practices.

It results in the loss of productivity and ecological balance in the affected areas.

Explanation

Sugarcane is a monocot plant with parallel leaf venation and fibrous roots.

Guava, Mango, and Rose are dicot plants with net-like venation and taproot systems.

Explanation

Explanation

Gear is: wheel or cylinder

Pulley is: a wheel with a grooved rim

Explanation

Air contains water vapour, smoke, dust particles, and ozone in varying amounts.

These components are naturally present in the atmosphere, contributing to various environmental and weather phenomena.

Explanation

Two or more forces acting on the same point at the same. time are called concurrent forces.

While

A concurrent coplanar force system is a system of two or more forces whose lines of action intersect at a common point.

Explanation

When an elevator accelerates downward, the normal force (apparent weight) decreases.

Thus, the person feels lighter than their actual weight.

Explanation

Fe3O4 occurs as a mineral with a chemical name Iron (II, III) oxide.

It is also known as Magnetite or Magnetic oxide.