Explanation

DNA (deoxyribonucleic acid) is a biopolymer composed of long chains of nucleotides, which are the building blocks of genetic material.

Biopolymers are naturally occurring polymers produced by living organisms.

Explanation

Gibberellins are plant hormones that promote cell elongation, especially in internodal regions.

Explanation

A thermodynamically spontaneous reaction occurs without the need for external energy input under given conditions, meaning it has a negative Gibbs free energy (ΔG < 0).

Explanation

O₂ (oxygen molecule) is paramagnetic because it has unpaired electrons in its molecular orbitals.

According to Molecular Orbital Theory (MOT), the electronic configuration of O₂ reveals 

There are two unpaired electrons in the π* anti-bonding orbitals, which are responsible for its paramagnetic properties.

Hybridization and resonance do not directly explain the presence of unpaired electrons in this context.

Explanation

In the complex  [Ni(CN) 4] ^2−, nickel is in the +2 oxidation state and is surrounded by four cyanide (CN⁻) ligands.

According to Crystal Field Theory and based on the strong field nature of cyanide ligands, the complex adopts a square planar geometry.

Explanation

Alpha rays, or alpha particles, are the least penetrating form of radiation.

They consist of two protons and two neutrons

Making them relatively large and heavy compared to beta and gamma rays.

Explanation

Tube feet, respiratory tree, and papillae are all present in Holothuroidea, which are commonly known as sea cucumbers.

Holothuroidea is a class of echinoderms that includes various species of sea cucumbers.

Explanation

Demography is the statistical study of human populations.

Demography examines the size, structure, and movements of populations over space and time. 

Explanation

The spleen is often referred to as the "graveyard of RBCs"

Because it is responsible for filtering and breaking down old, damaged, and worn-out red blood cells (RBCs).

Explanation

Newton's first law of motion is also called as Law of inertia.

• Inertia is the ability of a body by virtue of which it opposes a change.
  
• According to Newton’s first law of motion, an object will remain at rest or in uniform motion in a straight line
• unless acted upon by an external force.
  • The inertia of rest: When a body is in rest, it will remain at rest until we apply an external force to move it. This property is called inertia of rest.
  • The inertia of motion: When a body is in a uniform motion, it will remain in motion until we apply an external force to stop it. This property is called inertia of motion.