All-in-One Exam Prep Platform

Explanation

The largest animal in the world: Blue whale

An adult whale can grow to about 30m long

Its weight is more than 180,00kg

Blue whale belongs to a group of mammals

The blue whale also has a heart that has four chamber

The heart of a blue whale weighs around 900kg.

Explanation

• The female reproductive part of a flower is called the Pistil.

It consists of three parts:

1. Stigma (receives pollen grains)
2. Style (connects stigma to ovary)
3. Ovary (contains ovules/eggs)

The pistil is also sometimes referred to as the carpel, which is a modified leaf that forms the female reproductive organ.

Explanation

Pyridine has a lone pair on nitrogen that is not involved in resonance, making it readily available for donation.

In aniline and phenol, lone pairs are delocalized into the aromatic ring, reducing basicity.

Explanation

Explanation

A step-up transformer increases the voltage of the input signal, resulting in a higher voltage output.

This is achieved by having more turns in the secondary coil than in the primary coil.

Explanation

Herbert Spencer (1820–1903) was an English philosopher who initiated a philosophy called 'Social Darwinism'.

He coined the term 'survival of the fittest' seven years before Darwin's publication of his theory of natural history.

The Origin of the Species in 1859.

Explanation

An electrophile is a species that seeks electrons and can accept an electron pair.

C₂H₅OCH₃ (Ethyl methyl ether) is not an electrophile.

Because it lacks an electron-deficient center and does not readily accept electron pairs.

Explanation

Explanation

Diamond is anisotropic because its properties vary depending on the direction in which they are measured.

This is due to its crystalline structure, where the carbon atoms are arranged in a specific lattice.

The bonds between the carbon atoms are strong and are oriented along specific crystal axes.

As a result, diamond exhibits different mechanical strengths, refractive indices,

And other properties depending on the orientation of the crystal axes relative to the applied force or measurement. 

Explanation

The photoelectric effect does not occur if the frequency of the incident light is below the threshold frequency.

The threshold frequency is the minimum frequency required for the incident photons to have enough energy to eject electrons from the surface of the material.

If the frequency is below this value, no electrons are emitted, regardless of the light intensity.