The correct answer is option 4 i.e. Ethanol.

Ethanol is a common solvent used in the preparation of various medicinal and health products. 

Ethanol is used as a solvent to dissolve iodine and potassium iodide. Ethanol may be used to dissolve and stabilize certain active ingredients in cough syrups. It can also enhance the flavor or act as a preservative.

The correct answer is option 1 i.e. 56.

According to Newlands' Law of Octaves, it was proposed that there were approximately 56 elements in nature. According to this law, when elements were arranged in increasing order of their atomic masses, every eighth element showed similar properties to the first element, similar to musical octaves. Newlands' law focused primarily on lighter elements, such as up to Calcium, fitting them into his classification system.

The correct answer is option 2 i.e. Chlorophyll.

The leaves have a green pigment called chlorophyll which helps capture energy from sunlight. Chlorophyll is essential for the process of photosynthesis, where plants convert light energy into chemical energy to produce food in the form of glucose. This pigment absorbs light, primarily in the blue and red wavelengths, and reflects green light, giving leaves their characteristic green color. The energy captured by chlorophyll is used to convert carbon dioxide and water into oxygen and glucose, sustaining plant life.

The correct answer is option 2 i.e. In vitro fertilization.

In biology, the term "IVF" stands for In Vitro Fertilization. IVF is a process used to assist with conception, where an egg is fertilized by sperm outside the body, in a laboratory dish ("in vitro" means "in glass"). The fertilized egg, or embryo, is then implanted into the uterus, where it can develop into a pregnancy. IVF is a common assisted reproductive technology (ART) used to help individuals and couples with fertility challenges achieve pregnancy.

The correct answer is option 4 i.e. IAA.

The universal natural auxin of plants is indole-3-acetic acid (IAA). Auxins are a class of plant hormones that play crucial roles in various aspects of plant growth and development, including cell elongation, root initiation, fruit development, and tropic responses (such as phototropism and gravitropism).

IAA is produced naturally within plants and is involved in regulating processes such as apical dominance (control of growth at the shoot apex), lateral root development, and differentiation of vascular tissue.

The correct answer is option 2 i.e. Snail.

It is known that some snail species can change sex.This phenomenon is called sequential hermaphroditism or protandry in the case of snails, where an individual organism can change from one sex to another during its lifetime.

In many snail species, individuals start life as males and later change into females as they grow and mature. This adaptation allows for increased reproductive flexibility and may be influenced by environmental factors such as population density, availability of mates, and hormonal changes.

The correct answer is option 4 i.e. Banana.

Banana can be used as an instant energy booster. Bananas are rich in carbohydrates, particularly natural sugars such as glucose, fructose, and sucrose, which provide a quick source of energy.

Additionally, they contain essential nutrients like potassium and vitamin B6, which help in energy metabolism. Thus, eating a banana can give an immediate and sustained energy boost.

The correct answer is option 1 i.e. Gymnosperm.

Conifers, cycads, and ginkgo plants belong to the group known as Gymnosperms. Gymnosperms are a group of seed-producing plants whose seeds are not enclosed within a fruit. Instead, they are exposed on the surface of specialized leaves or scales, often arranged in cones or similar structures.

The correct answer is option 1 i.e. Lysosome.

The organelle you're referring to is the lysosome. It contains enzymes that break down various biomolecules such as proteins, nucleic acids, lipids, and carbohydrates. Lysosomes play a crucial role in cellular waste disposal, the recycling of cellular components, and in defense against invading pathogens.

The correct answer is option 1 i.e. Nitric acid.

• In alchemy, aqua fortis is the classical name for nitric acid (HNO₃).
• Nitric acid is a highly corrosive and strong mineral acid that is commonly used in the manufacture of explosives, fertilizers (such as ammonium nitrate), and in organic synthesis processes.