Hemoglobin is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates which carries oxygen from the respiratory organs to the rest of the body. It changes shape when it binds oxygen. When it changes shape, it absorbs different wavelengths of light, making it change color. When blood is exposed to air, much more of the hemoglobin absorbs oxygen than had in the vein the blood came from. Therefore, the blood turns red.

Correct Option: B

Hemoglobin is the iron-containing oxygen-transport metalloprotein in the red blood cells of all vertebrates which carries oxygen from the respiratory organs to the rest of the body. It changes shape when it binds oxygen. When it changes shape, it absorbs different wavelengths of light, making it change color. When blood is exposed to air, much more of the hemoglobin absorbs oxygen than had in the vein the blood came from. Therefore, the blood turns red.

The heart is a hollow muscle that pumps blood throughout the blood vessels by repeated, rhythmic contractions. In mammals, the function of the right side of the heart (see right heart) is to collect deoxygenated blood, in the right atrium, from the body (via superior and inferior vena cavae) and pump it, through the tricuspid valve, via the right ventricle, into the lungs (pulmonary circulation) so that carbon dioxide can be dropped off and oxygen picked up (gas exchange). This happens through the passive process of diffusion.

Correct Option: D

The heart is a hollow muscle that pumps blood throughout the blood vessels by repeated, rhythmic contractions. In mammals, the function of the right side of the heart (see right heart) is to collect deoxygenated blood, in the right atrium, from the body (via superior and inferior vena cavae) and pump it, through the tricuspid valve, via the right ventricle, into the lungs (pulmonary circulation) so that carbon dioxide can be dropped off and oxygen picked up (gas exchange). This happens through the passive process of diffusion.

Plants produce new cells and grow only in their shoot and root apical meristems and leaf primordia; this is localized growth. In contrast, all parts of an animal's body grow (diffuse growth). From the time we are embroys until we are about 18 years old, all parts of our body grow simultaneously. Due to a plant's localized growth, an individual plant can have older, completely mature and highly functional leaves at the same time that it is still producing new leaves.

Correct Option: C

Plants produce new cells and grow only in their shoot and root apical meristems and leaf primordia; this is localized growth. In contrast, all parts of an animal's body grow (diffuse growth). From the time we are embroys until we are about 18 years old, all parts of our body grow simultaneously. Due to a plant's localized growth, an individual plant can have older, completely mature and highly functional leaves at the same time that it is still producing new leaves.

Cuscuta (Dodder) is a genus of about 100-170 species of yellow, orange or red (rarely green) parasitic plants. Dodders are supremely adapted for a life of plunder and pillage. Reduced in form to scrambling and twining threads, they appear to be completely leafless, although closer inspection reveals tiny scale leaves pressed close to the stems. So it is a stem parasite.

Correct Option: B

Cuscuta (Dodder) is a genus of about 100-170 species of yellow, orange or red (rarely green) parasitic plants. Dodders are supremely adapted for a life of plunder and pillage. Reduced in form to scrambling and twining threads, they appear to be completely leafless, although closer inspection reveals tiny scale leaves pressed close to the stems. So it is a stem parasite.

A bird-adapted strain of H5N1, called HPAI A(H5N1) for "highly pathogenic avian influenza virus of type A of subtype H5N1", is the causative agent of H5N1 flu, commonly known as "avian influenza" or "bird flu”.

Correct Option: A

A bird-adapted strain of H5N1, called HPAI A(H5N1) for "highly pathogenic avian influenza virus of type A of subtype H5N1", is the causative agent of H5N1 flu, commonly known as "avian influenza" or "bird flu”.