Explanation

The steroid hormones are synthesized in the :

the adrenal cortex,

the gonads,

and the placenta

The steroid hormones are all derived from cholesterol and many are of clinical importance

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Cholesterol is the fundamental building block for all other steroids in the body.

Cholesterol is also the precursor of other important: steroid metabolites including bile salts and steroid hormones.

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ND11-12-2022

Explanation

The S-block includes Group 1 (alkali metals) and Group 2 (alkaline earth metals) along with helium, totaling 14 elements.

These elements have their outermost electrons in the s-orbital.

Additional Information:

P-block → 6 groups (13–18) → 38 elements

D-block → Transition metals (Groups 3–12) → 40 elements

F-block → Lanthanides + Actinides → 28 elements

Explanation

Cultivation means means پودوں کی تیاری اور ان کی پرورش کا عمل - بنیادی طور پر ان میں اضافہ

Growing means پودوں کی تیاری اور ان کی پرورش کا عمل - بنیادی طور پر ان میں اضافہ

Explanation

Aldol condensation can occur between two aldehydes, two ketones, or an aldehyde and a ketone if they have at least one α-hydrogen.

The reaction forms a β-hydroxy compound, which often dehydrates to an α,β-unsaturated product.

Explanation

Asset means کوئی قیمتی یا فائدہ مند چیز - ایک طاقت یا فائدہ

Advantage means کوئی قیمتی یا فائدہ مند چیز - ایک طاقت یا فائدہ

Explanation

Radon (Rn) is a radioactive noble gas that is formed naturally from the decay of uranium and thorium in the Earth’s crust.

It is colorless, odorless, and radioactive.

It is often found in soil and rock.

Explanation

Synthetic rubber like neoprene is made by the polymerization of chloroprene (C₄H₅Cl).

It is known for its resistance to oil, heat, and weathering, making it useful in industrial applications.

Explanation

Silicon has the highest melting point among the given elements due to its giant covalent structure.

It requires more energy to break the strong covalent bonds.

Explanation

I have never known him for a long time.

میں اسے ایک عرصے سے کبھی نہیں جانتا تھا۔

"Have never known" is the correct present perfect tense.

It indicating that up until now, the speaker has never known the person.

Explanation

Nitrobenzene reacts slower than benzene in electrophilic substitution due to the electron-withdrawing nitro group.

The NO₂ group deactivates the benzene ring, making it less reactive toward electrophiles.