Explanation

 According to Gauss's Law, the net electric flux through a closed surface depends on the net charge enclosed.

If equal and opposite charges are present inside the surface, their total is zero, so the net electric flux is also zero.

Explanation

The kinetic energy is mathematically expressed as K. E=12mv2,

where m is the mass of the body and v is the velocity with which the body is moving

If velocity v is doubled, the kinetic energy becomes four times as kinetic energy is directly proportional to the square of velocity.

Explanation

Ripened ovary or fertilized ovary is called a fruit.

Post-fertilization changes in plants involve:

endosperm formation

embryo development

seed

fruit formation.

while

Ovules at maturity or ripened ovules are known as seeds.

The second male gamete fuses with the diploid secondary nucleus to form triploid endosperm which nourishes the developing embryo.

Explanation

A tonne (also called metric ton) is a non-SI unit of mass defined as 1 tonne= 1000 kg (= 106 g).

A tonne is a metric unit of mass equivalent to 1,000 kg or 2,204.6 lbs.

while

ton is an imperial unit of mass equivalent to 1,016.047 kg or 2,240 lbs.

Explanation

Sodium chloride (NaCl) forms ionic bonds, which are considered the strongest type of bonding in solids.

These bonds involve a strong electrostatic attraction between positively charged sodium ions (Na+) and negatively charged chlorine ions (Cl-).

This results in a stable crystal lattice structure, requiring a significant amount of energy to overcome and melt the compound. 

Explanation

 Tetraethyl lead (TEL) was historically added to gasoline to increase its octane rating and reduce knocking, but due to its environmental concerns, it has largely been phased out. 

Explanation

The formation of the primitive streak occurs during the gastrula stage of embryogenesis. 

The primitive streak is a crucial structure that appears at the beginning of gastrulation,

A stage where the three germ layers (ectoderm, mesoderm, and endoderm) are established.

It serves as a pathway for cells to migrate and differentiate into these germ layers

Explanation

The molecule that cannot form hydrogen bonding among themselves is All of the above. 

Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom (oxygen, nitrogen, or fluorine) in one molecule and is attracted to the lone pair of electrons on another electronegative atom in a different molecule. 

A) CH₂O (Formaldehyde):

While the oxygen is electronegative, the hydrogen is not directly bonded to it, so it cannot participate in hydrogen bonding.

B) CH₃CHO (Acetaldehyde):

Similar to A, the hydrogen is not directly bonded to the oxygen.

C) (CH₃ – CH₂)₃N (Trimethylamine):

Although the nitrogen is electronegative, the hydrogen atoms are not directly bonded to the nitrogen.

Explanation

The kidneys are responsible for filtering blood and regulating the amount of water and electrolytes excreted in urine.

They can adjust the concentration of urine depending on the body's hydration needs.

This makes them the primary organ for controlling water balance. 

Explanation

 Gonadotropic hormones, like follicle-stimulating hormone (FSH) and luteinizing hormone (LH),

They are specifically secreted by specialized cells called gonadotrophs within the anterior pituitary gland.