Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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21.

In leaves of C4 -plants malic acid synthesis during CO2 -fixation occurs in

  • epidermal cells

  • mesophyll cells

  • bundle sheath

  • bundle sheath


B.

mesophyll cells

C4- plants show Kranz anatomy. In the leaves of C4- Plants the vascular bundles are surrounded by bundle sheath of parenchymatous cells, which in turn are surrounded by mesophyll cells. In C4 -plants and Hatch and Stack pathway involve two carboxylation reaction one taking place in the chloroplast of mesophyll cells and other in the chloroplast of bundle sheath cells. 

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22.

Cellulose is the major component of cell walls of 

  • Pythium

  • Xanthomonas

  • Pseudomonas

  • Pseudomonas

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23.

The slow rate of decomposition of fallen logs in nature is due to their

  • low moisture content

  • poor nitrogen content

  • anaerobic environment around them

  • anaerobic environment around them

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24.

Carbohydrates are commonly found as starch in plant storage organs. which of the following five properties of starch (A-E) make it useful as a storage material?

A) Easily translocated

B) Chemically non-reactive

C) Easily digested by animals

D) Osmotically inactive

E) Synthesized during photosynthesis

The useful properties are 

  • (B) and (C)

  • (B) and (D)

  • (A), (C) adn (E)

  • (A), (C) adn (E)

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25.

Replum is present in the ovary of flower of 

  • lemon

  • Mustard

  • Sunflower

  • Sunflower

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26.

The haemoglobin of human foetus

  • has a lower affinity for oxygen than that of the adult

  • its affinity for oxygen is the same as that of an adult

  • has only 2 protein subunits instead of 4

  • has only 2 protein subunits instead of 4

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27.

Which one of the following scientist's name is correctly matched with the theory put forth by him?

  • Weissmann-Theory of continuity of germplasm

  • Pasteur - Inheritance of acquired characters

  • de Vries - Natural selection

  • de Vries - Natural selection

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28.

The most active phagocytic white blood cells.

  • neutrophils ane eosinophils

  • lymphocytes and macrophages

  • eosinophils and lymphocytes

  • eosinophils and lymphocytes

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29.

The two subunits of ribosome remain united at a critical ion level of

  • Copper

  • Manganese

  • Manganese

  • Manganese

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30.

During the propagation of a nerve impulse, the action potential results from the movement of 

  • K+ ions form extracellular fluid of intracellular fluid

  • Na+ ions from intracellular fluid to extracellular fluid

  • K+ ions from intracellular fluid to extracellular fluid

  • K+ ions from intracellular fluid to extracellular fluid

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