Explanation

Sexual reproduction is the type of reproduction that involves the fusion of gametes (sperm and egg cells) to produce offspring with a unique combination of genetic traits.

This process introduces genetic variation, which is essential for evolution to occur.

Explanation

The skeleton is the framework that gives shape to the human body and provides support, protection, and movement.

It consists of bones, cartilage, and ligaments that work together to form a structural system.

Explanation

• Transition elements, also known as transition metals, are a group of elements in the d-block of the periodic table.
• They are characterized by their ability to form ions with different charges.
• They are often found in the middle of the periodic table.

Explanation

The correct order is: Ribosomes → RER → Golgi body → Lysosome.

• Ribosomes: Protein synthesis occurs here, and the newly synthesized protein is released into the cytosol.
• RER (Rough Endoplasmic Reticulum): The protein is transported to the RER, where it is processed and modified (e.g., folding, glycosylation).
• Golgi body: The protein is packaged into vesicles and transported to the Golgi body, where it is further modified and sorted.
• Lysosome: The protein is delivered to lysosomes, where it can be used for various cellular processes (e.g., digestion, recycling).

Explanation

The cooling fins at the back of a refrigerator are typically made of a black, rough surface to maximize heat radiation. This design:

• Increases the surface area for heat transfer
• Absorbs heat from the surrounding air
• Emits heat more efficiently due to the rough surface

Explanation

Activators are molecules that increase the activity of enzymes, often by binding to a specific site on the enzyme.

Inhibitors are molecules that decrease the activity of enzymes, often by binding to a specific site on the enzyme.

Explanation

The radioactive decay equation shows a parent nucleus (91Pa^233) decaying into a daughter nucleus (92U^233) with the emission of a particle.

The parent nucleus has an atomic number of 91 (Protactinium), and the daughter nucleus has an atomic number of 92 (Uranium).

This increase in atomic number indicates that a beta particle (β) has been emitted.

Explanation

To determine the symbol of element B with five protons and six neutrons, we can follow these steps:

The number of protons (atomic number) determines the element. An element with five protons is boron (B).

The mass number (A) is the sum of protons and neutrons. For this element, it is 5 + 6 = 11.

Therefore, the symbol for this element is 11B.

Explanation

The atomic mass (also known as atomic weight) of an element is the total mass of protons and neutrons present in the nucleus of an atom.

This includes:

• Mass of protons (which defines the element)
• Mass of neutrons (which varies in different isotopes)

Explanation

• If the area of the parallel plate capacitor is doubled, the capacitance will also double.
• The capacitance of a parallel plate capacitor is directly proportional to the area of the plates: C = ε × (A/d)