Explanation

Tube feet function in locomotion, feeding, and respiration.

The tube feet in a starfish are arranged in grooves along the arms.

They operate through hydraulic pressure.

They are used to pass food to the oral mouth at the center, and can attach to surfaces.

Explanation

Nuclear fusion is the process by which two light atomic nuclei combine to form a single heavier one while releasing massive amounts of energy.

Explanation

Mustards, cabbages, and their many relatives belong to the scientific family Cruciferae (or Brassicaceae), commonly called the mustard family.

The name Cruciferae, meaning “cross bearers,” comes from the shape of the flowers.

Explanation

Resin ducts are elongated and tubular in structure.

These have intercellular spaces surrounded by epithelial cells that secrete resin into the canal.

They can be traced in the wood of the genera Picea, Larix, Pinus, Pseudotsuga, andShorea.

Explanation

The smallest gymnosperm is Zamia pygmia which reaches a height of 25 cm.

Explanation

Centrosomes are membrane-free organelles that serve as main microtubule-organizing centres in distinct eukaryotic lineages. 

Explanation

The essential components of infectious viral particles are nucleic acid (the genome) and protein.

Explanation

Semiconservative nature of DNA replication was first proved by Matthew Meselson and Franklin Stahl in 1958, by their experiment in Escherichia coli.

According to this scheme, the two strands of DNA would separate from each other and will act as the template for DNA replication.

After the completion of the DNA replication, each new DNA will have one parental strand and one new strand.

Hence, this was known as the semiconservative nature of DNA replication.

Explanation

Cnidarians are radially or biradially symmetric, a general type of symmetry believed primitive for eumetazoans.

They have achieved the tissue level of organization,

in which some similar cells are associated into groups or aggregations called tissues, but true organs do not occur.

Explanation

Ecdysone is a steroidal prohormone.

It is one of the major insect molting hormone.

The hormone is secreted from prothoracic glands.

This hormone is responsible for ecdysis or molting.

This is an important event which occurs during metamorphosis.

Corpus allata secretes juvenile hormone which is known as neotenin.