Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Which one is not diploblastic?

  • Sponge

  • Cnidarian

  • Nematoda

  • Tenophora


C.

Nematoda

Diploblastic animals have two primary germ layers ectoderm and endoderm as in Porifera, Coelenterata and Ctenophora. Sponges belong to Phylum- Porifera, Cindarian belongs to Phylum- Coelenterata and tenophora belongs to Phylum- Ctenophora.


22.

In algae, the bacteriological filter is

  • Oscillatoria

  • Batrachospermum

  • Nostoc

  • Cosmarium


D.

Cosmarium

Cosmarium commonly known as desmid and member of green algae has highly porous cell wall and these pores keep on secreting mucilage.


23.

Feathery stigma belongs to

  • Wheat

  • pea

  • Datura

  • Caesalpinia


A.

Wheat

Stigma is the receptacle part of the carpel ,which is the female floral whorl. During the process of fertilisation, pollen grains get deposited on the stigma. A long and feathery stigma is generally found in flowers pollinated by wind. Their feathery nature helps in trapping pollen grains transported by wind.


24.

The petiole modified into flattened lamina like structure is present in

  • Acacia nilotica

  • Acacia arabica

  • Acacia australasia

  • Acacia auriculoformis


D.

Acacia auriculoformis

The type of modification when petiole of leaf is modified into lamina or leaf blade like structure it is known as phyllode. It is only Australian species which forms phyllodes.


25.

In Pinus

  • seed is winged but pollen grains are not

  • both seed and pollen grains are wingless

  • pollen grains are winged but seed is not

  • both seeds and pollen grains are winged


D.

both seeds and pollen grains are winged

Pinus is a large and economically important genus of coniferous evergreen trees chiefly of temperate regions of the northern hemisphere that includes a number which yield products (as pine tar) with medicinal applications. Winged seed and pollen grain is the
characteristic feature of Pinus.


26.

Which one of the following pairs of plants are not seed producers?

  • Fern and Funaria

  • Funaria and Ficus

  • Ficus and Pinus

  • All of the above


A.

Fern and Funaria

Fern and Funaria are not seed producers as they are cryptogams whereas Ficus and Pinus are spermaphyta.


27.

One of the set is wrongly matched

  • Chrysanthemum - Sucker

  • Garlic  - Cloves

  • Cyanodon - Stolon

  • None of the above


C.

Cyanodon - Stolon

Cynodon is a genus of plants in the grass family. It has runners.

Chrysanthemums or mums or chrysanths, are flowering plants of the genus Chrysanthemum in the family Asteraceae. It is propogated vegetatively either through root suckers or terminal cuttings.


28.

Which of the following plants are all roots?

  • Podostemon

  • Lemna

  • Wolffia

  • Utricularia


A.

Podostemon

Podostemon is a thalloid of assimilatory roots clinging to nodes by hyptera. Short living shoots grow from this root.


29.

This place in India is called 'The Golden Mine of Liverworts'

  • Eastern Himalayas

  • Western Himalayas

  • Western Ghats

  • Eastern Ghats


A.

Eastern Himalayas

Liverwort is a small flowerless green plant with leaf like stems or lobed leaves, occurring in moist habitats. It lack true roots and reproduce by means of spores released from capsules. The Golden mine of liverworts is Eastern Himalayas. There are 320 endemic species of liverworts in this region.


30.

Corm is an

  • underground vertical leaf

  • underground swollen stem

  • underground horizontal root

  • underground horizontal leaf


B.

underground swollen stem

Corm is a short vertical underground swollen stem which is fleshy and solid as seen in Gladiolus, Crocus and Colocasia.