Explanation

A metastable state is an excited state of an atom or molecule that has a significantly longer lifetime compared to other excited states, but is still shorter than the ground state.

This means that an electron in a metastable state can stay in that state for a relatively long time before transitioning back to a lower energy level. 

Explanation

The binding energy per nucleon is highest for intermediate-sized nuclei (e.g., iron).

Both lighter and heavier nuclei have lower binding energies per nucleon compared to these intermediate nuclei.

Explanation

Quaternary

(Haemoglobin has a quaternary structure as it consists of multiple polypeptide chains.)

Explanation

The vector product (cross product) of two vectors gives a vector that is perpendicular to both original vectors.

Angular momentum is a vector product of position and linear momentum vectors.

Explanation

• Animal cells do not have chloroplasts, as they are not capable of photosynthesis.
• Animal cells also do not have a cell wall, unlike plant cells and some other organisms.

The components of an animal cell:

• Cell Membrane
• Cytoplasm
• Small Vacuole
• Nucleus
• Chromosomes

Explanation

Explanation

Endometriosis is a condition where tissue similar to the lining of the uterus grows outside the uterus.

This tissue can cause pain and infertility, primarily in women.

There is very strong evidence linking endometriosis to female infertility.

Studies show that a significant portion of women with infertility also have endometriosis.

While endometriosis can rarely occur in men, it is not considered a significant cause of infertility in males. 

Explanation

 The proper term for "X" is Plane of symmetry.

A plane of symmetry is an imaginary plane that divides a crystal into two halves, where each half is the mirror image of the other. 

Explanation

 When a sound wave moves from one medium to another, the quantity that remains the same is its frequency. 

The frequency of a sound wave is determined by the source of the sound and doesn't change when it enters a different medium.

However, the wavelength and speed of the wave can change depending on the properties of the new medium. 

Explanation

Adjective is a word tells which one, what kind or how many. 

An adjective modifies or describes a noun or pronoun