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NEET Biology Solved Question Paper 2012

Multiple Choice Questions

Which of the following is correct regarding respiration in adult frog

In water- Skin, gills
On land - Skin, buccal cavity
In water- Skin, buccal cavity
On land- Skin, lungs, gills

Which of the following is correctly matched

Monstera- Fibrous root
Dahlin- Fasciculated root
Azadirachta- Adventitious root
Basil- Prop roots

Deuteromycetes are known as fungi imperfecti because

their zygote undergoes meroblastic and holoblastic cleavage
only asexual stages are known
they have aseptate myceliun
they are autotrophic

Abscisic acid is known as the stress hormone because it

breaks seed dormancy
induces flowering
promotes leaf fall
promotes closure of stomata

One of the world's most poisonous fish toxins is released by

clown fish
eel fish
sword fish
puffer fish

Na⁺/K⁺ pump is associated with

passive transport
active transport
osmosis
imbibition

7.
Photorespiration shows formation of

sugar but not ATP

ATP but not sugar

both ATP and sugar

neither ATP nor sugar

neither ATP nor sugar

Photorespiration is the light dependent process of oxygenation of ribulose biphosphate (RuBP) and release of carbon dioxide by the photosynthetic organs of a plant. Normally photosynthetic organs do the reverse in the light, i.e., uptake of CO₂ and release of O₂ At high temperature, RuBP carboxylase functions as oxygenase and instead of fixing carbon dioxide (C₄ cycle), oxidises ribulose 1, 5-biphosphate to produce a 3-carbon phosphoglyceric acid and a 2-carbon phosphoglycolate. Photorespiration does not produce energy or reducing power. Rather, it consumes energy. Further, it undoes the work of photosynthesis. There is 25% loss of fixed CO₂. Therefore, photorespiration is a highly wasteful process. This happens only in case of C₄ plants. C₄ plants have overcome the problem of photorespiration.