Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Companion cells are closely associated with 

  • sieve elements

  • vessel elements

  • trichomes

  • guard cells


A.

sieve elements

Companion cells are characteristic elements of phloem tissue associated with the sieve tubes(sieve elements) in the angiosperms. The siever tubes and companion cells are related ontogenically as they develop from the same mother cell. The companion cells and sieve tubes maintain close cytoplasmic connections through plasmodesmata.

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2.

Best defined function of manganese in green plants is

  • Photolysis of water

  • Calvin cycle

  • Nitrogen fixation

  • Water absorption


A.

Photolysis of water

Photolysis of water requires light energy, an Oxygen-Evolving Complex (OEC) and electron carrier 1/2. OEC complex was formerly called Z-enzyme. It has four Mn ions. Light energy brings about changes in Mn (Mn+2,  Mn3+,  Mn+4) which helps in removing electrons from OH- component of water forming oxygen. Liberation of oxygen also requires Cl- and Ca+2.

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3.

A process that makes important difference between C3 and C4 plants is

  • transpiration

  • glycolysis

  • photosynthesis

  • photorespiration


D.

photorespiration

Photorespiration is a light dependent process which occurs in C3 plants. It is opposite to photosynthesis because during this process uptake of O2 and release of CO2 take place. Due to the presence of Kranz anatomy, C4 plants do not show photorespiration. 

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4.

Consumption of which one of the following foods can prevent the kind of blindness associated with vitamin ‘A’ deficiency?

  • ‘Flaver Savr’ tomato

  • Canolla

  • Golden rice

  • Bt-Brinjal


C.

Golden rice

Golden rice is a variety of Oryza sativa (rice) produced through genetic engineering to biosynthesize Beta-acetone, a precursor of vitamin-A in the edible part of rice (i.e., endosperm). The research that led golden rice was conducted with the goal of helping children who suffer from vitamin-A deficiency. Because many children in countries where there is a dietary deficiency in vitamin-A rely on rice as a staple food, the genetic modification of rice to produce the vitamin-A precursor beta-carotene is seen as a simple and less expensive alternative to vitamin supplements. 

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5.

The most abundant prokaryotes helpful to humans in making curd from milk and in production of antibiotics are the ones categorised as

  • Cyanobacteria

  • Archaebactera

  • Chemosynthetic autotrophs

  • Heterotrophic bacteria


D.

Heterotrophic bacteria

Heterotrophic bacteria are most abundant in nature. Many of them have a significant impact on human affairs. These are helpful in making curd from milk (e.g., Lactobacillus sp.), production of antibiotics (e.g., Streptomyces sp.) and fixing nitrogen in legume roots (e.g, Rhizobium spe).

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6.

The maximum amount of electrolytes and water (70-80 percent from the glomerular filtrate is reabsorbed in which part of the nephron?

  • Ascending limb of loop of Henle

  • Distal convoluted tubule

  • Proximal convoluted tubule

  • Descending limb of loop of Henle


C.

Proximal convoluted tubule

From the Bowman's capsule, the glomerular filtrate enters the proximal convoluted tubule (PCT). PCT is surrounded by a network of peritubular capillaries and is the seat of reabsorption. About 75% of glomerular filtrate is normally reabsorbed in PCT before reaching the loop of Henle. The reabsorbed materials include glucose, amino acids, vitamins, hormones, sodium, potassium, chlorides, phosphates, bicarbonates, most of water and some urea etc. 

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7.

The human hind brain comprises three parts, one of which is

  • spinal cord

  • corpus callosum

  • Cerebellum

  • hypothalamus


C.

Cerebellum

The hindbrain generally has its anterior roof enlarged to form a pair of cerebellar hemispheres. Its floor is thickened to for the pons anteriorly and the medulla oblongata posteriorly. 

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8.

Pheretima and its close relatives derive nourishment from

  • sugarcane roots

  • decaying fallen leaves and soil organic matter

  • soil insects

  • small pieces of fresh fallen leaves of maize


B.

decaying fallen leaves and soil organic matter

Food of earthworm (Pheretima sp.) consists of organic matter, fallen decaying leaves, algae, etc., present in the soil. Food is swallowed along with soil by sucking action. 

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9.

A certain road accident patient with unknown blood group needs immediate blood transfusion. His one doctor friend at once offers his blood. What was the blood group of the donor

  • Blood group B

  • Blood group AB

  • Blood group O

  • Blood group A


C.

Blood group O

Blood group is tested by two types of sera i.e., anti-A (antibody-A) and anti-B (antibody-B). Persons with blood group O Possess both antibodies in their plasma but have no antigens in their RBCs. So, RBCs of blood group 'O' do not show clumping in way of the sera. That's why, persons with blood group 'O' are called universal donor and they can donate blood to a person with any type of blood group.

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10.

Which part of the human ear plays no role in hearing as such but is otherwise very much required?

  • Eustachian tube

  • Organ of corti

  • Vestibular apparatus

  • Ear ossicles


A.

Eustachian tube

The inner ear contains a complex system called vestibular apparatus, located above the cochlea. It has no role in hearing but is influenced by gravity and movements. Its specific receptors called crista and macula are responsible for maintenance of balance of the body and posture. 

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