Daily NEET MCQ- August 29, 2022 - NEET MCQ

Thomson proposed a model of the atom, in which electrons are embedded to make it as the stable electrostatic arrangement and such that positive charge is equally distributed around a sphere. Mass is assumed to be equally distributed. So. it has different names like plum pudding, watermelon and raisin pudding model.

Henri Becquerel discovered that elements emit radiation and termed this phenomenon as radioactivity. Later Curie on research found out about α-rays, β-rays and γ-rays. Later Rutherford concluded that α particles are helium nuclei.

One of the main important uses of diborane is that it is used in rockets as a propellant. The complete combustion of diborane is highly exothermic. Though, the complete combustion in rockets isn’t possible due to the production of boron monoxide.

The motion of a body in a plane can be defined by using two variables. These are the two defining axes of the Coordinate system, x and y. Once we have the displacement as a function of these to variables, any other quantity can be found out.

Circular motion is an example of motion in a plane. As a circle is a 2-dimensional entity, the body moving in a circle is also moving in a plane. Hence the motion can be termed as motion in a plane.

A rocket moving into space is an example of 3-dimensional motion. Hence, it cannot be out in the category of motion in a plane. Rest all examples of motion in a plane. The truck moving in an infinite spiral is also an example of motion in a plane as spiral is a 2-dimensional entity.

Pteridophytes are the first ever evolved plants with vascular tissue in them i.e. they contain xylem and phloem. As they contain vascular tissues, they are capable of growing several meters tall.

Sporophytes bear sporangia in leaf like structures called sporophylls. Sporangia further ruptures to form spores that germinate into a gametophyte containing archegonium and antheridium.

Sporophyte is dominant phase in the life cycle of a Pteridophyte whereas Gametophyte, Prothallus and Zygote are intermediary stages in the life cycle of a Pteridophyte.

Pteridophytes are classified into four classes namely, Psilopsida; Pteropsida; Sphenopsida; and Lycopsida. Sporopsida doesn’t belong to this set of classification. Therefore, it is the odd among the four.