Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Which one of the following categories of animals, is correctly described with no single exception in it?

  • All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal)

  • All bony fishes have four pairs of gills and an operculum on each side

  • All sponges are marine and have collared cells

  • All sponges are marine and have collared cells


B.

All bony fishes have four pairs of gills and an operculum on each side

Prototherian mammals are oviparous. Sponges are aquatic mostly marine some freshwater have cellular grade of organization. Choanocytes or collar cells are characteristics of porifers. Four pair of gills occur in bony fishes. The gills are covered over by operculum on either side.
All reptiles posses scales,  are cold blood but have three-chambered and four-chambered heart.

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12.

Vernalisation stimulates flowering in

  • Zamikand

  • Turmeric

  • Carrot

  • Carrot


C.

Carrot

Vernalization is a process of shortening of juvenile or vegetative phase and hastening flowering by a previous cold treatment. Example - henbane, carrot, cabbage.

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13.

Plants with ovaries having only one or a few ovules, are generally pollinated by

  • Bees

  • Butterflies

  • Birds

  • Birds


D.

Birds

The transfer of pollen grains from anther to stigma is called pollination. Anemophily is a mode of pollination accomplished through wind, while entomophily is the mode of pollination, accomplished by insects like moth, butterflies, wasps, bees, etc. The plants with ovaries having only one or a few ovules are generally pollinated by wind but sometimes by insects.

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14.

As compared to a dicot root, a monocot root has

  • more abundant secondary xylem

  • many xylem bundles

  • inconspicuous annual rings

  • inconspicuous annual rings


B.

many xylem bundles

The vasculature is radial in dicot root i.e.,xylem bundles alternate with phloem bundles. Usually vascular bundles are 2-6 in number while in monocot root the vascular strand consists of several (8 or more) alternate radial xylem and phloem bundles. Secondary growth takes place in dicot root while absent in monocot roots and annual rings do not form. 

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15.

For its action, nitrogenase requires

  • high input of energy

  • light

  • Mn2+

  • Mn2+


A.

high input of energy

The enzyme nitrogenase is a Mo-Fe protein and catalyses the conversion of atmospheric N2 to NH3 as
straight N subscript 2 plus 8 straight e to the power of minus plus 8 straight H to the power of plus plus 16 ATP space rightwards arrow space 2 NH subscript 3 plus straight H subscript 2 plus 16 ADP plus 16 straight P subscript straight i
Enzyme nitrogenase functions under anaerobic condition and the pigment leghaemoglobin protect it from oxygen. 

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16.

The second stage of hydrosere is occupied by plants like

  • Azolla

  • Typha

  • Salix

  • Salix


D.

Salix

Hydrosere originating in a pond starts with colonisation of some phytoplanktons which forms the pioneer plant community. The stages are
1st- Bacteria,  Blue-green algae, Algae
2nd- Hydrilla Potamogeton, Vallisneria
3rd -Nelumbo, Nymphaea, Trapa, Azolla, Wolffia
4th-Typha, Sagitaria
5th- Juncus, Cyperus
6th- Salix, Populus, Almus

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17.

Which one of the following organisms is scientifically correctly named, correctly printed according to the International Rules of Nomenclature and correctly described?

  • Musca domestica – The common house lizard, a reptile

  • Plasmodium falciparum – A protozoan pathogen causing the most serious type of malaria

  • Felis tigris – The Indian tiger, well protected in Gir forests

  • Felis tigris – The Indian tiger, well protected in Gir forests


B.

Plasmodium falciparum – A protozoan pathogen causing the most serious type of malaria

According to binomial nomenclature the scientific name is consist of genus and species. The genus name is started with capital letter and both the word Latinized. Musca domestica is European housefly. It belongs to phylum-Arthropoda.
E.coli is having full name Escherichia coli a commonly occurring bacterium in human intestine.
Panthera tigris is Indian tiger and protected in Gir forest.

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18.

Which one of the following pairs of animals are similar to each other pertaining to the feature stated against them?

  • Pteropus and Ornithorhyncus - Viviparity

  • Garden lizard and Crocodile - Three chambered heart

  • Ascaris and Ancylostoma - Metameric segmentation

  • Ascaris and Ancylostoma - Metameric segmentation


D.

Ascaris and Ancylostoma - Metameric segmentation

Metameric segmentation is found in Annelida not Nematoda (Ascaris).
Crocodile has four-chambered heart.
Sea horse and flying fish belong to class-Pisces. These are cold-blooded animals.
Ornithorhynchus is oviparous mammal.

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19.

Cuscuta is an example of

  • ectoparasitism

  • brood parasitism

  • predation

  • predation


A.

ectoparasitism

Cuscutta (Amarbel) is a total stem parasite that grows on a number of plants like - Citrus, Duranta, Zizyphus, etc. It sends a number of haustoria into the host. Xylem and phloem of haustorium make connection with sap and food channel of host.
Predation is an interaction in which member of one species capture, kill and eat up member of Endoparasite lives inside the host body. 

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20.

Which one of the following generally acts as an antagonist to gibberellins?

  • Zeatin

  • Ethylene

  • ABA

  • ABA


C.

ABA

Abscisic acid (ABA) is also called stress hormone. It is a mildly acidic growth hormone which functions as a general growth inhibitor by counteracting other hormones (auxin, gibberellin, cytokinin) or reactions mediated by them. It causes stomatal closure, abscission of flower and fruits while gibberellin helps in opening of stomata and promote development of fruits. 

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