Explanation

• Monotremes are mammals that lay eggs instead of giving birth to live young.
• The platypus and echidnas are the only living groups of monotremes.
• Placentals develop their young inside the uterus with the help of a placenta.
• Marsupials usually give birth to underdeveloped young that continue developing in a pouch.
• Cetacea includes whales, dolphins, and porpoises.

Last verified on 27-10-2026

Explanation

• Gonyaulax is a marine dinoflagellate commonly associated with red tides, which occur when certain microscopic algae multiply rapidly in seawater.
• Red tides can discolor seawater reddish-brown.
• It may release toxins that harm fish, shellfish, and other marine organisms.

Last verified on 27-10-2026

Explanation

• Mitochondria produce most of the ATP (adenosine triphosphate) in eukaryotic cells through aerobic cellular respiration.
• ATP is the main energy-carrying molecule of the cell.
• It provides energy for various cellular activities.

Additional information:

• ATP is also produced in the cytoplasm during glycolysis.
• In plant cells, chloroplasts also produce ATP during photosynthesis.
• It is mainly for use within the chloroplast.

Last verified on 27-10-2026

Explanation

• Plasmids are small, usually circular DNA molecules found mainly in bacteria, separate from the bacterial chromosome.
• They replicate independently and may carry genes that provide advantages, such as antibiotic resistance.

Last verified on 27-10-2026

Explanation

• Riccia is a simple liverwort belonging to the bryophytes.
• Its sporophyte is highly reduced and consists mainly of a capsule embedded in the gametophyte.
• In Riccia, the capsule lacks a well-developed seta and elaters.
• The spores are released when the surrounding gametophytic tissue decays.

Last verified on 27-10-2026

Explanation

• The lingual vein drains blood from the tongue region in a frog and carries it toward the venous circulation.
• The cutaneous veins carry blood from the skin, which is important for cutaneous respiration in frogs.

Last verified on 27-10-2026

Explanation

• Facilitated diffusion uses membrane transport proteins, such as channel or carrier proteins, to move substances from higher to lower concentration.
• This process is a type of passive transport, so it does not require cellular energy (ATP).

Additional information:

• Active transport moves substances against their concentration gradient and usually requires energy.
• Simple diffusion occurs directly through the membrane without transport proteins.

Last verified on 27-10-2026

Explanation

• The carinal canal forms due to the disintegration of protoxylem elements in the stem of Equisetum (horsetail).
• It is located within each vascular bundle, beneath the ridge of the stem.
• The vallecular canals are different cavities located beneath the grooves of the stem.
• They are associated with the cortex.

Last verified on 27-10-2026

Explanation

• A facultative parasite normally lives as a parasite but can also survive independently as a saprophyte by obtaining nutrients from dead and decaying organic matter.

Additional information:

• An obligate parasite depends on a living host to complete its life cycle or survive and reproduce.
• A facultative saprophyte is the opposite: it normally lives on dead organic matter but can become parasitic under suitable conditions.

Last verified on 27-10-2026

Explanation

• Exhaled air contains about 16% oxygen.
• Because the body absorbs some oxygen during gas exchange in the lungs.
• Atmospheric air contains approximately 21% oxygen.
• Exhaled air contains approximately 4% carbon dioxide, compared with about 0.04% in atmospheric air.

Last verified on 27-10-2026