Explanation

Papaya plants are mostly dioecious, meaning male and female flowers are on separate plants, requiring cross-pollination.

Wind and insects help transfer pollen from male to female flowers for fruit production.

Explanation

Meninges are the three protective membranes (dura mater, arachnoid mater, and pia mater) that surround the brain and spinal cord.

They help protect the central nervous system and contain cerebrospinal fluid (CSF).

Explanation

Cyclic ethers containing two ether groups are called crown ethers.

These compounds have a ring structure with multiple oxygen atoms, forming a "crown-like" shape that can bind to metal ions. 

Explanation

Meissner’s corpuscles are specialized mechanoreceptors that detect light touch and vibrations in the skin.

They are most abundant in fingertips, lips, and palms.

Explanation

Adipic acid has six carbon atoms with carboxylic acid groups at both ends — hence the name hexane-1,6-dioic acid.

It is a dicarboxylic acid.

It is widely used in the production of nylon.

Explanation

An ulcer is a gut disorder where the inner lining of the stomach or intestine becomes sore or eroded.

It often causes pain, bleeding, and discomfort, especially in the stomach or small intestine.

Explanation

DNA contains deoxyribose sugar, not ribose.

Ribose sugar is found in RNA, not in DNA.

Explanation

• Tritium, also known as superheavy hydrogen.
• It has 1 proton and 2 neutrons in its atomic nucleus.

Explanation

Milk has a pH around 6.5, making it slightly acidic compared to bread and egg.

Eggs and bread are closer to neutral or slightly basic, especially egg whites.

Explanation

NH₄⁺ (ammonium ion) is formed by a coordinate covalent bond between nitrogen and an extra hydrogen.

Within NH₄⁺, atoms are bonded by covalent bonds.

NH₄⁺ and Cl⁻ are held together by an ionic bond.