CBSE Class 9 Biology Diversity in Living Organisms MCQs Set 11

Answer: (b) Genus, family, order, class, phylum

Explanation:
1. The hierarchy runs species, genus, family, order, class, phylum, kingdom.
2. Genus, family, order, class, phylum is in the correct increasing order.

Teacher's Note:
1. A mnemonic can help you remember the order.
2. Species is the smallest unit.

Answer: (a) Monera : eukaryote

Explanation:
1. Monera are prokaryotes, not eukaryotes, so the first pair is wrong.
2. The other pairs are correct.

Teacher's Note:
1. Choanocytes are collar cells of sponges.
2. Nematocysts are stinging cells of Hydra.

Answer: (c) Euglena

Explanation:
1. Euglena has chlorophyll and makes food like a plant, and also moves and feeds like an animal.
2. So it links plants and animals.

Teacher's Note:
1. It has a flagellum for movement.
2. It is a protist.

Answer: (b) Paramecium

Explanation:
1. Paramecium is slipper-shaped and moves with cilia.
2. So it is called the slipper animalcule.

Teacher's Note:
1. It lives in freshwater.
2. Its body is covered with cilia.

Answer: (d) Euglena

Explanation:
1. Euglena makes food by photosynthesis in light and feeds on organic matter in the dark.
2. This mixed nutrition is called mixotrophic.

Teacher's Note:
1. It is both autotrophic and heterotrophic.
2. That is why it is a link between plants and animals.

Answer: (b) Protista

Explanation:
1. Kingdom Protista includes unicellular eukaryotes like Amoeba and Paramecium.
2. Monera are prokaryotes.

Teacher's Note:
1. Whittaker proposed five kingdoms.
2. Protista are the link between prokaryotes and multicellular organisms.

Answer: (a) Leishmania donovani

Explanation:
1. Leishmania donovani causes kala-azar (visceral leishmaniasis), spread by the sandfly.
2. Trypanosomes cause sleeping sickness.

Teacher's Note:
1. The disease affects the spleen and liver.
2. It is common in parts of India.

Answer: (d) Ringworm

Explanation:
1. Ringworm is a skin infection caused by a fungus.
2. Cholera, plague and typhoid are bacterial diseases.

Teacher's Note:
1. It appears as a ring-shaped rash.
2. Fungi are thallophytes.

Answer: (d) Both heterotrophic nutrition and type of stored food

Explanation:
1. Fungi, like animals, are heterotrophic and store food as glycogen.
2. So both characters are common.

Teacher's Note:
1. Plants store food as starch.
2. Fungal cell walls contain chitin, which is not found in animal cells.

Answer: (c) Algae

Explanation:
1. Algae are thallophytes (no root, stem, leaf) that contain chlorophyll and make their own food.
2. Fungi are heterotrophic.

Teacher's Note:
1. Thallophytes have an undifferentiated body.
2. Examples are Spirogyra and Ulothrix.

Answer: (a) Funaria

Explanation:
1. Funaria is a moss and belongs to bryophytes.
2. Volvox, Chlorella and Spirulina are algae or bacteria.

Teacher's Note:
1. Bryophytes are called the amphibians of the plant kingdom.
2. Mosses grow on moist walls and rocks.

Answer: (d) Liverworts and mosses

Explanation:
1. Bryophyta includes liverworts and mosses.
2. Ferns and club mosses are pteridophytes.

Teacher's Note:
1. Marchantia is a liverwort.
2. Funaria is a moss.

Answer: (b) Pteridophyta

Explanation:
1. Pteridophytes (ferns) have vascular tissue but do not form seeds or flowers.
2. They are called vascular cryptogams.

Teacher's Note:
1. Cryptogams are plants without seeds.
2. Phanerogams bear seeds.

Answer: (d) Pteridophyta

Explanation:
1. True roots first appeared in pteridophytes.
2. Bryophytes have only root-like rhizoids.

Teacher's Note:
1. Pteridophytes were the first vascular plants.
2. Vascular tissue helps in conduction.

Answer: (d) All of the above

Explanation:
1. Gymnosperms have no vessels in the xylem, no companion cells in the phloem and do not form fruits.
2. So all the options are correct.

Teacher's Note:
1. Their seeds are naked.
2. Pine and cycas are gymnosperms.

Answer: (a) An ovary

Explanation:
1. A fruit develops from the ovary.
2. Gymnosperms have naked ovules without an ovary.

Teacher's Note:
1. The word gymnosperm means naked seed.
2. The seeds are on the surface of cone scales.

Answer: (b) Canal system

Explanation:
1. Sponges are classified mainly by the type of canal system (asconoid, syconoid, leuconoid).
2. The skeleton is also used.

Teacher's Note:
1. Sponges have pores for water entry.
2. Spicules form the skeleton.

Answer: (c) Porifera

Explanation:
1. In sponges the cells are loosely organised and there are no true tissues.
2. This is the cellular grade.

Teacher's Note:
1. Coelenterates have a tissue grade.
2. Flatworms have an organ grade.

Answer: (d) Very few freshwater and mostly marine

Explanation:
1. Most sponges live in the sea, and a very few (like Spongilla) live in freshwater.
2. So option (d) is correct.

Teacher's Note:
1. Spongilla is a freshwater sponge.
2. Sponges are sessile.

Answer: (d) A polymorphic, colonial coelenterate

Explanation:
1. Physalia, the Portuguese man-of-war, is a colonial coelenterate with different kinds of individuals.
2. It has stinging tentacles.

Teacher's Note:
1. It is a siphonophore.
2. It floats on the sea surface.

Answer: (b) Coelenterata

Explanation:
1. Corals are coelenterates (cnidarians) that live in colonies and secrete a calcium carbonate skeleton.
2. They form coral reefs.

Teacher's Note:
1. Sea anemones are also coelenterates.
2. They have stinging cells.

Answer: (d) Hydra

Explanation:
1. Hydra has radial symmetry and two germ layers (ectoderm and endoderm).
2. The others are bilaterally symmetrical and triploblastic.

Teacher's Note:
1. Diploblastic animals have two layers of cells.
2. Coelenterates show radial symmetry.

Answer: (b) Schistosoma

Explanation:
1. Schistosoma lives in blood vessels and is called the blood fluke.
2. Fasciola is the liver fluke.

Teacher's Note:
1. It causes schistosomiasis.
2. It is a parasite of the Platyhelminthes.

Answer: (a) Flatworms

Explanation:
1. All three are flatworms of phylum Platyhelminthes.
2. Planaria is free-living, so they are not all parasites.

Teacher's Note:
1. Their bodies are flat and not segmented.
2. They have flame cells for excretion.

Answer: (c) Nephridia

Explanation:
1. Annelids like earthworms have segmentally arranged nephridia as excretory organs.
2. Flame cells are found in flatworms.

Teacher's Note:
1. Each segment has a pair of nephridia.
2. They remove nitrogenous waste.

Answer: (a) Cnidoblasts

Explanation:
1. Cnidoblasts (cnidocytes) are stinging cells found in coelenterates.
2. They help in catching prey and defence.

Teacher's Note:
1. Hydra has them on its tentacles.
2. Green glands are excretory organs of crustaceans.