NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Photorespiration usually occurs in

  • one cell organelle

  • two cell organelles

  • three cell organelles

  • four cell organelles


three cell organelles

In the process of photorespiration, uptake of oxygen and evolution of carbon- dioxide are light dependent. RuBP carboxylase acts as RuBP oxygenase. This process occurs in chloroplast and required the help of peroxisomes and mitochondria.


Coconut's husk fibre, coir of commerce is extracted from

  • epicarp

  • mesocarp

  • endocarp

  • all of these



Commercial coir is obtained from the fibrous husk or mesocarp of fruits of coconut palm. It is valued for its lightness and high resistance to mechanical wear and dampness.


The protists have

  • only free nucleic acid aggregates

  • membrane bound nucleoproteins lying embedded in the cytoplasm

  • nucleoprotein in direct contact with the rest of the cell substance

  • none of these


membrane bound nucleoproteins lying embedded in the cytoplasm

Protists are a very diverse group of organisms. They are eukaryotic micro- organisms. They have membrane bound nucleoproteins lying embedded in the cytoplasm. They are primarily microscopic and unicellular or made up of a single cell.


Tadpoles can be made to grow in size and become adult by

  • injecting thyroxine hormone

  • feeding the eggs of other frogs

  • injecting gonadotrophic hormones

  • providing them with suitable climatic conditions


injecting thyroxine hormone

Tadpoles can be made to grow in size and become adult by injecting thyroxine hormone. By metamorphosis, tadpole grows in size and becomes adult. It is under neuroendocrine control.

Thyroxine Releasing Factor or TRF is secreted by Hypothalamus.

Anterior Pituitary gets stimulated and produces TSH.

Thyroid produces T4 and T3 hormones.

Metamorphosis of the tadpole starts.


Clove is a

  • floral bud

  • modified root

  • auxillary bud

  • seed


floral bud

Cloves are unopened and aromatic floral buds of a tree in the Family- Myrtaceae, Syzygium aromaticum. It is commonly used as a spice.


All veins carry deoxygenated blood except

  • pulmonary vein

  • hepatic vein

  • hepatic portal vein

  • renal vein


pulmonary vein

Pulmonary vein carries oxygenated blood from the lungs to the left atrium of the heart.

Hepatic Vein, hepatic portal vein and renal vein carry deoxygenated blood.


Induction of flowering by low temperature in plants is

  • cryobiology

  • vernalization

  • phototropism

  • pruning



Vernalization is the induction of a plant's flowering process by exposing it to low temperature. It shortens the juvenile or vegetative phase of the plant. This term was coined by Lysenko in 1928.

Cryobiology is the branch of biology that studies the effects of low temperature on living things within Earth's cryosphere or in science.

Phototropism is the orientation of a plant or other organism in response to light, either towards the source of light or away from it.

Pruning is a horticultural and silvicultural practice involving the selective removal of certain parts of a plant, such as branches, buds or roots.


Hydroponics is

  • cultivation of plants in water

  • growth of plants towards water

  • growth of plants away from water

  • soil less cultivation of plants


soil less cultivation of plants

Hydroponics is soil less cultivation of plants by placing the roots in the nutrient solution.


Velamen is a specialized tissue found in

  • aerial roots of orchids

  • succulent leaves

  • pneumatophores

  • stilt roots


aerial roots of orchids

Velamen is a dead spongy tissue present in epiphytic roots or hygroscopic roots. These roots are able to absorb water from moist atmosphere, dew and rain.


A frog has its brain crushed. But when pinched on the leg, The leg draws away. It is an example of

  • neurotransmitter incluced response

  • simple reflex

  • conditioned reflex

  • automated motor response


simple reflex

Simple reflex action is a nerve mediated spontaneous automatic and involuntary response to a stimulus acting on a specific receptor without consulting the will of the animal.

Conditioned reflexes are those reflex actions that are not present at birth but develop later in life through learning, habit, experience or regular association of an indifferent stimulus with unconditioned stimulus.