General Science Mixed Practice — MCQs with Answers (Set 6)

Nematodes, lac insects, and aphids all live as parasites feeding on plant tissue or sap.

Orchids are famous for this deceptive pollination strategy, mimicking female insects to attract pollinating males.

Several crop plants, including pea, sugar beet, and cabbage, require a cold period before they will flower.

Phosphoglyceric acid (3-PGA) is the first stable compound formed when carbon dioxide is fixed in the Calvin cycle.

Root hairs provide the vast surface area needed for the bulk of a plant’s water absorption.

Annual growth rings form one new layer per year in temperate trees, giving a reliable age count.

True fruits form from the ovary, apple is a false fruit, and coconut and mango both are drupes.

Only the gibbon statement is correct. The hoolock gibbon is the only gibbon found in India. Pangolins do live in India. The country has two species, the Indian pangolin and the Chinese pangolin.

Fossil evidence shows early mammal ancestors were egg-laying, and they first appeared in the Triassic period.

Fish are not mammals, unlike bats, whales, and humans, all of which nurse young with milk.

Ostrich, emu, and kiwi all lack the ability to fly, despite being classified as birds.

Pneumatic bones are a bird adaptation for lighter weight and more efficient flight, seen in the pigeon.

Echinodermata is an exclusively marine phylum, unlike Mollusca, Chordata, and Porifera, which all have freshwater members.

Antedon, Ophiura, and Echinus are all echinoderms, unlike cuttlefish, sea hare, and Chaetopleura, which are molluscs.

Mollusca ranks second in size, bears a calcareous shell, and divides into head, visceral mass, and foot.

A mantle cavity and coelom are defining molluscan features, unlike the segmented, chitin-covered arthropod body plan.

Silk is made of the proteins fibroin and sericin, produced by mulberry-fed caterpillars, and its rearing is called sericulture.

Spiders belong to Class Arachnida, not Class Insecta, chiefly because they have eight legs, not six.

Limulus, the horseshoe crab, earns the living-fossil label for having changed little over hundreds of millions of years.

Cockroach, scorpion, and prawn all belong to Arthropoda, unlike the mollusc and flatworm species mixed into the other options.

Sponge skeletons consist of hard or flexible spicules, which provide structural support to the body.

Bilateral symmetry concentrates sensory organs at a front end, allowing faster and more precise responses.

Panthera pardus designates the leopard, distinguishing it from Panthera tigris (tiger) and Panthera leo (lion).