Daily NEET MCQ- April 28, 2022 - NEET MCQ

The nuclei of atoms having even numbers of both protons and neutrons are the most stable ones and this also means that they are less radioactive than nuclides containing even numbers of protons and odd numbers of neutrons.

Rutherford was the form to measure the size of the nuclei of an atom by 1911. He discovered that these were about 104 times smaller than the atoms that constituted them and this was due to the fascinating way that the alpha particles scattered from metal foils.

According to the Lewis dot-structure, the central oxygen atom shares a total of three electrons as a consequence of which it bears a positive charge. The oxygen to the right forms tends to attract a shared pair of electrons towards itself, thereby developing the negative charge.

Ozone freezes at -192.2°C. When in solid state, it forms a violet-black structure. After melting, the color transitions to deep blue. Finally, as it is everywhere seen in the sky, ozone gas is pale blue.

Due to its ease in liberating nascent oxygen i.e. [O], ozone is a powerful oxidizing agent. Although, it is highly thermodynamically unstable and explosive due to large negative Gibbs energy, the ability of liberating nascent oxygen, it is considered to be one of most powerful bleaching agents.

Mammary gland cells develop the potential to produce milk towards the end of pregnancy. This process is termed as lactation.

The first couple of days after the onset of lactation, the milk produced from the mammary glands is yellowish and rich in nutrients and antibodies for the newborn baby. This is called colostrum.

The colostrum is produced by the mammary glands for the first few days after the baby is born. The purpose is to protect the baby from the antigens it will be exposed after entering the world for the first time. Hence it is enriched with antibodies.

The antibodies in the colostrum help the body of the baby, which has been exposed to the external world full of different antigens, the ability to fight. This is called immunity.

The time taken by a developing embryo inside the womb of a placental mammal is called the gestation period, at the end of which a baby is delivered in the act of parturition.