Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

carthamus tinctorius belongs to family

  • Asteraceae

  • Solanaceae

  • Malvaceae

  • Fabaceae


A.

Asteraceae

Carthamus tinctorius (safflower) belongs to family Asteraceae.The asterfamily(Asteraceae) is one of the largest angiospermfamilies, with more than 1,620 genera and 23,600 species of herbaceous plants, shrubs, and trees distributed throughout the world. The plants are characterized by their composite flower heads and one-seeded achene fruits.


12.

The plant undergoes wilting when

  • xylem is blocked

  • cambium is blocked

  • phloem is blocked

  • some roots are reduced in number


A.

xylem is blocked

WiltingThe condition that arises in plants when more water is lost by evaporation than is absorbed from the soil. This causes the cells to lose theirturgorand the plant structure droops. Plants can normally recover from wilting if water is added to the soil, but permanent wilting and possible death can result if the plant does not have access to water for a long period of time. In certain plants wilting is important as a mechanism to avoid overheating: when the leaves droop they are taken out of direct contact with the sun's rays. When the sun sets the plant can begin to transpire at the normal rate and the cells of the leaves regain their turgor.

Xylem is responsible for transport of water. If xylem is blocked, plant will undergo wilting


13.

Cranium is made up of

  • 8 bones

  • 12 bones

  • 10 bones

  • 16 bones


A.

8 bones

The human skull is generally considered to consist of twenty-two bones—eight cranial bones and fourteenfacial skeletonbones. In the neurocranium these are theoccipital bone, twotemporal bones, twoparietal bones, thesphenoid,ethmoidandfrontal bones.


14.

The function of surfactant is/are

  • facilitating lung expansion

  • maintaining the stable size of the alveoli

  •  to reduce the surface tension on the alveoli

  • all of the above


C.

 to reduce the surface tension on the alveoli

Pulmonary surfactant is a mixture of lipids and proteins which is secreted by the epithelial type II cells into the alveolar space. Its main function is to reduce the surface tensionat the air/liquid interface in the lung.


15.

The organism in which Kreb's cycle does notoccur in mitochondria is

  • yeast

  • E.coli

  • Ulothrix

  • mould


B.

E.coli

Kreb cycle doesn't occurs in mitochondria in E.coli beacuseE.coli are prokaryotes.


16.

Stomata open at night and closes during day in

  • xerophytes

  • gametophytes

  • mesophytes

  • mesophytes


A.

xerophytes

Crassulacean acid metabolism, also known asCAMphotosynthesis, is a carbon fixation pathway that evolved in someplantsas an adaptation to arid conditions. In aplantusing fullCAM, thestomatain the leaves remain shut during the day to reduce evapotranspiration, butopenat night to collect carbon dioxide (CO2).


17.

During muscle contraction

  • size of 'A' bands remain same

  • size of 'H' zone becomes smaller

  • size of 'I' band decreases

  • diameter of fibre increases


A.

size of 'A' bands remain same

During muscle contraction, both I-band and H-zone progressively shorten and eventually disappear while length of A-band remains constant.


18.

Two chief functions of the leaves are

  • photosynthesis and respiration

  • photosynthesis and transpiration

  • transpiration and respiration

  • respiration and digestion


B.

photosynthesis and transpiration

Photosynthesis and transpiration both are equally essential processes because photosynthesis helps to maintain the equilibrium position of O2 and CO2 in the atmosphere and transpiration maintains the atmospheric temperature.


19.

Lucocytes (WBCs) are considered as true cells because

  • they possess nucleus

  • they do not contain haemoglobin

  • they show great power of movement

  • they are responsible forphagocytic activity


A.

they possess nucleus

Leucocytes are called true cells because they possess nucleusunlike RBC where nucleus are absent.


20.

The most advanced type of inflorescence is

  • corymb

  • catkin

  • spadix

  • capitulum


D.

capitulum

Capitulum is the most advanced type of inflorescence. It is the characteristic of family Compositae. In this inflorescence peduncle is flattened to form receptacle that bears centripetally arranged small sessile flowers called florets surrounded by involucre of bracts, eg., marigold, sunflower etc.