Explanation

• Lampreys belong to the group Cyclostomata.
• They lack true jaws and paired fins.
• Their mouth is circular and adapted for attachment.

Last verified on 06-11-2026

Explanation

• The notochord is a flexible, rod-shaped structure that is present during the embryonic stage of all chordates
• It provides support and defines the primitive axis of the body.
• This characteristic is a key feature that distinguishes chordates from non-chordates.

Last verified on 06-11-2026

Explanation

• Leeches are segmented worms belonging to phylum Annelida.
• Their bodies show metameric segmentation.
• They possess a true coelom, although it is reduced in leeches.

Last verified on 06-11-2026

Explanation

• Radula is a ribbon-like feeding organ found in most molluscs.
• It contains rows of tiny teeth used to scrape or cut food.
• Bivalves generally lack a radula.

Last verified on 06-11-2026

Explanation

• Malpighian tubules remove nitrogenous wastes from the insect's body.
• They help maintain water and salt balance.
• They are connected to the digestive tract.

Last verified on 06-11-2026

Explanation

Explanation

• The three standard stop codons in mRNA are UAA, UAG, and UGA.
• These codons signal the termination of protein synthesis.
• UGG codes for the amino acid tryptophan.

Last verified on 06-11-2026

Explanation

• Chief cells are present in the gastric glands of the stomach.
• They secrete pepsinogen, an inactive precursor of pepsin.
• Hydrochloric acid helps convert pepsinogen into active pepsin.

Last verified on 06-11-2026

Explanation

• Whales are marine mammals (Mammalia).
• It belonging to the order Cetacea.
• This also includes dolphins and porpoises.
• They breathe air, give birth to live young, and produce milk to feed their offspring, like all mammals.

Last verified on 06-11-2026

Explanation

• The gizzard is a muscular part of the bird's stomach.
• It mechanically grinds food, often with the help of swallowed small stones.
• The proventriculus performs chemical digestion by secreting digestive juices.

Last verified on 06-11-2026