NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


The given symbols of floral parts indicate the condition:

% or CA or PA or G

  • zygomorphic flower, epipetalous, epiphyllous, superior ovary

  • actinomorphic flower, epipetalous, interior ovary

  • zygomorphic flower, epiphyllous, epipetalous, superior ovary

  • actionmorphic flower, epipetalous, superior ovary


zygomorphic flower, epipetalous, epiphyllous, superior ovary

Symbols of floral parts indicate the following condition of a flower-

% - Zygomorphic flower (cannot cut into two equal parts)

CA - Epipetalous condition androecium attached to corolla

PA - Epiphyllous condition

G- Superior ovary


A plant produced 50 flowers. Ovary of each flower has 50 ovules. How many fruits and seeds are produced by that plant, respectively?

  • 50, 50

  • 50, 100

  • 50, 2500

  • 2500, 2500


50, 50

50 flowers have 50 ovules. 50 fruits from 50 ovaries will be obtained and 50 seeds from 50 ovules will be obtained.

So, 50 fruits and 50 seeds will be produced by 50 flowers.


Read the following statements.

I. Adam's apple in man is formed by thyroid cartilage.

II. The maximum volume of air a person can breath in after forced expiration is vital capacity.

III. About 20-25% of CO, is transported as carbaminohaemoglobin.

IV. Pneumotaxic centre lies in pons.

The correct statement(s) is

  • Only I

  • I, II

  • I, II, III

  • I, II, III, IV



Adam's apple is a projection in front of neck formed by thyroid cartilage of the larynx, more prominent in man. Vital capacity is the maximum volume of air that person breaths out after forceful inspiration.


CO2 is carried by heamoglobin in the form of carbamino haemoglobin, partial pressure of O2 affects this binding. Pons Varolii of brain act as a pneumotaxic centre, which regulates rhythm of breathing mechanism.


Bioluminescence is a characteristic feature of

  • Diatoms

  • Dinoflagellates

  • Slime moulds

  • Euglenoid



Bioluminescence is the property of a living organism to emit light. Some marine dinoflagellates show bioluminescence i.e., emitting light, Noctiluca, Pyrodinium, Pyrocystis, etc.


Identify the wrong statement.

  • The degree of decrease of chemical potential of water depends on concentration of solute

  • Bacteria and fungal spores are killed when they enter into pickels and jams due to plasmolysis

  • The process of water excudation is called transpiration

  • Reverse plasmolysis will occur when flaccid cells are placed in hypotonic solution


The process of water excudation is called transpiration

Transpiration is the process of loss of water vapours from plant body surface. 

Guttation is the process of excudation of xylem sap on the edges of leaves. It takes place by hydathodes.


What did Engelmann observe from his prism experiments?

  • Bacteria could not detect the sites of O2 evolution.

  • Bacteria release excess carbon dioxide in red and blue light

  • Bacteria accumulated due to the increase in temperature caused by increase in oxygen concentration

  • Bacteria get accumulated towards red and blue light


Bacteria get accumulated towards red and blue light

Engelmann prism experiment showed effect of light on photosynthesis. He illuminated an alga Spirogyra with different colour of light using a prism. He found that blue and red light is most effective in the run on photosynthesis and bacterium (Rhodospirillum) accumulate on alga in red and blue light.


Select the mismatch.

  • Tomato - Axile placentation

  • Sunflower - Free central placentation

  • Pea - Marginal placentation

  • Poppy - Parietal placentation


Sunflower - Free central placentation

Placentation is the arrangement of a placenta or placentae in the ovary of a flower. In sunflower, basal placentation is seen. The ovary is unilocular and bears a single placenta at a base with generally a single ovule. Other examples include Marigold and Ranunculus.


The heterocysts in the cyanobacterium are

  • site of photosynthesis

  • reserve food storage

  • enactive enzymes

  • nitrogen-fixation



Heterocysts are specialized nitrogen fixing cells during nitrogen starvation by some filamentous cyanobacteria. Certain cyanobacterias like Nostoc, Anabaena, Scytonenca, etc possess special cells, heterocysts to perform special functions like nitrogen-fixation.


Identify the type of flagella Column I based on there structures given in Column II.

Column I (Flagella type) Column II (Structure)
A. Monotrichous 1. 
B. Amphitrichous 2.
C. Lophotrichous 3. 
D. Peritrichous 4. 

  • A - 1; B - 2; C - 3; D - 4

  • A - 2; B - 1; C - 4; D - 3

  • A - 4; B - 3; C - 2; D - 1

  • A - 4; B - 1; C - 2; D - 3


A - 4; B - 3; C - 2; D - 1

The number and distribution of flagella on the bacterial surface are characteristics for a given species, based on this flagella can be

A. Monotrichous - A single flagella that extends from one end of the cell.


B. Amphitrichous - A single or multiple flagella that extends from both ends of the cell.

C. Lophotrichous - Multiple or several flagella that extends from one or both ends of the cell.

D. Peritrichous - Multiple flagella may be randomly distributed over the entire bacterial cell.


Select the mismatch

  • Algae Thallus
    Chalamydomonas Unicellular flagellate
  • Chlorella Unicellular non flagellate
  • Ulva Parenchymatous
  • Volvox Non- flagellate colonies


Volvox Non- flagellate colonies

Volvox is a fresh water, green, colonial algae containing fixed number of cells called coenobium. The cells are biflagellate and interconnected by cytoplasmic strands.