Science & Technology II — SSC Practice Test Review: 21 MCQs with answers

B · DNA → RNA → protein

The Jacob–Monod model states that DNA is transcribed into RNA, which is then translated into protein.

D · Cytoplasm

Glycolysis takes place in the cytoplasm, where glucose is broken down to pyruvic acid.

D · Turbine

The turbine is coupled to the generator and its rotation drives the generator to produce electricity.

D · Pseudomonas

Pseudomonas bacteria can degrade hydrocarbons and are used in bioremediation of oil spills.

A · Carpel

The carpel (or pistil) is the female reproductive part, containing the ovary with ovules.

D · Meiosis

Meiosis is a reduction division that produces four haploid cells from one diploid cell.

B · Organisms with favourable variations survive and reproduce

Natural selection favors organisms with variations that are advantageous in their environment, allowing them to survive and reproduce.

C · Protect wild animals, birds, and plants and prohibit hunting of scheduled species

The Act provides legal protection to wildlife and prohibits hunting of scheduled species, among other provisions.

D · Mutation theory

Hugo de Vries proposed the mutation theory of evolution.

A · True

Glycolysis occurs in the cytoplasm and breaks glucose into pyruvic acid.

A · Large number of spores and moisture/nutrients

The rapid spread is due to the large number of spores (many starting points) and the availability of moisture and nutrients in the bread.

B · It has annelid-like segmentation and arthropod-like jointed legs

Peripatus shows features of both annelids (segmentation, nephridia) and arthropods (jointed legs, tracheae), making it a connecting link.

B · Jointed appendages, chitinous exoskeleton, segmented body

Arthropods are characterized by jointed appendages, a chitinous exoskeleton, and a segmented body.

D · By binary fission and conjugation

Paramoecium reproduces asexually by binary fission and sexually by conjugation.

A · Presence of a notochord

Chordates possess a notochord at some stage of life, along with a dorsal hollow nerve cord, pharyngeal gill slits, and a post-anal tail.

D · Soft body, muscular foot, and mantle

Molluscs typically have a soft body, a muscular foot for locomotion, and a mantle that may secrete a shell.

A · Chemical energy (coal) → Heat energy (boiler) → Kinetic energy (turbine) → Mechanical energy (generator) → Electrical energy

The correct sequence is: chemical energy from coal is converted to heat energy in the boiler, which produces steam that drives the turbine (kinetic energy), which in turn rotates the generator to produce electrical energy.

A · DNA transcription → RNA synthesis → protein translation

The correct flow of genetic information involves DNA being transcribed into RNA (transcription), which is then translated into protein (translation). Thus, the processes are DNA transcription → RNA synthesis → protein translation.

D · Paramoecium: binary fission and conjugation; Euglena: binary fission; Flowering plant: sexual reproduction

Paramoecium reproduces through binary fission and conjugation, Euglena primarily reproduces by binary fission, and flowering plants reproduce sexually through the formation of seeds and fruits.

D · Calcareous shell, muscular foot, mantle

Phylum Mollusca is characterized by a soft body usually covered by a calcareous shell, a muscular foot for locomotion, and a mantle that encloses the visceral mass.

A · Peripatus shows segmentation and has soft body with jointed appendages

Peripatus exhibits features of both Annelida (segmentation and soft body) and Arthropoda (jointed appendages), which is why it is considered a connecting link between these two phyla.