Explanation

Robert Hooke discovered the "cell wall" in 1665 when he observed dead cork cells under a microscope.

He named these small compartments "cells" because they reminded him of the rooms in a monastery.

The concept of "protoplast," which refers to the living contents of a cell, was discovered later. 

Explanation

A heat engine operating in reverse is called a heat pump or a refrigerator.

Essentially, these devices move heat from a cooler area to a warmer area, requiring external work to do so, which is the opposite of how a heat engine functions. 

Explanation

The most important hormone in initiating and maintaining lactation after birth is prolactin. 

Prolactin is the hormone responsible for stimulating milk production in the breasts. 

Explanation

 The temperature scale that is independent of the nature of the working substance is the Thermodynamic scale (Kelvin scale). 

Explanation

Aromatic hydrocarbons have a high carbon-to-hydrogen ratio, which leads to incomplete combustion and the production of soot when burned, resulting in a smoky flame. 

Explanation

Each molecule of water (H₂O) has 10 electrons (2 from hydrogen and 8 from oxygen).

Therefore, 1 mole of water has 10 moles of electrons.

So, 10 moles of water have 10 x 10 = 100 moles of electrons.

Explanation

Frictional force is a non-conservative force.

Unlike conservative forces (such as elastic spring force, gravitational force, and electric force), friction dissipates energy as heat and does not store it.

It means the work done by friction depends on the path taken.

Explanation

Ozonolysis cleaves the double bond in 3-Ethyl-2-pentene, forming two carbonyl compounds.

The double bond is between C2 and C3:

CH3–CH=CH–CH(CH2CH3)–CH3

On ozonolysis, it breaks at the double bond, yielding:

- Ethanal (CH3CHO) from the CH= part

- 3-Pentanone (CH3COCH2CH2CH3) from the rest

Explanation

Bacteria, specifically Escherichia coli (E. coli),

They are commonly used in genetic engineering to produce large quantities of human insulin

. The insulin gene is inserted into the bacteria's DNA, allowing them to produce the insulin protein when replicated

Explanation

Tactile receptors, also known as Meissner's corpuscles,

They are highly concentrated in the glabrous skin (hairless skin) of the palms, fingertips, and soles, allowing for fine touch and sensitivity to light pressure.