Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Capitulum inflorescence is found in :

  • Compositae (Asteraceae)

  • Cruciferae (Brassicaceae)

  • Solanaceae

  • Malvaceae


A.

Compositae (Asteraceae)

Capitulum or head inflorescence is the characteristic feature of Family- Compositae (Asteraceae).

In capitulum inflorescence, main axis is suppressed and flowers or florets are produced from thalamus. The peripheral florets are unisexual and known as ray florets while central florets are bisexual and known as disc florets.


42.

Sugarcane show high efficiency of CO2 fixation because of :

  • Calvin cycle

  • Hatch and Slack cycle

  • TCA cycle

  • greater sunlight


B.

Hatch and Slack cycle

Sugarcane is a C4 plant. It fixes carbon dioxide by Hatch and Slack cycle. They do not show photorespiration, although, they are better photosynthesizers than C3 plants. C4 plants show better efficiency of CO2 fixation due to Hatch and Slack cycle. Also, C4 plants are better adapted to hot and arid climate than C3 plants.


43.

Fever in malaria is due to :

  • entry of sporozoites into blood capillaries

  • entry of merozoites into liver cells

  • release of merozoites from red blood cells

  • entry of cryptomerozoites into red blood cells


C.

release of merozoites from red blood cells

Malaria is caused by a Plasmodium vivax. Infective stage of Plasmodium is sporozoite. Schizogony is an asexual reproduction in which schizont is formed. It later undergoes three stages, namely, Pre-erythrocytic schizogony, Exo-erythrocytic schizogony and Erythrocytic schizogony. During erythrocytic schizogony RBCs gets ruptured to release merozoites, hence malarial fever is felt.


44.

Which is synthesized in G1 phase ?

  • DNA polymerase

  • Histones

  • Nucleolar DNA

  • Tubulin protein


A.

DNA polymerase

Cell cycle is divided into 4 phases, namely, G1, S, G2 and M- phase.

DNA polymerase is synthesized in G1- phase. DNA and histones are synthsized during S- phase. Mitotic spindle begins to form during G2- phase. Karyokinesis and cytokinesis occur during M phase.


45.

Which of the following fungi is found useful in the biological control of plant disease ?

  • Penicillium notatum

  • Phytophthora parasitica

  • Mucor mucido

  • Trichoderma viridae


B.

Phytophthora parasitica

Phytophthora parasitica is used as a biological control of plant disease.


46.

Which of the following organs is not involved in the elicitation of immune response?

  • Brain

  • Lymph nodes

  • Spleen

  • Thymus


A.

Brain

Brain is not involved in the elicitation of immune system. Lymphoid organs such as lymph nodes, spleen and thymus are involved in the elicitation of immune system.


47.

Which of the following is not a case of epimorphosis ?

  • Formation of sperms from small clumps of cells

  • Regeneration of tail in a lizard

  • Replacement of severed arm in starfish

  • Replacement of limb in salamander


A.

Formation of sperms from small clumps of cells

Epimorphosis is a form of development in segmented animals in which body segmentation is completed before hatching.

Formation of sperms from small clumps of cells can not be a case of epimorphosis.


48.

The origin of kidney and ureter in Rana tigrina is :

  • all mesodermal

  • all endodermal

  • ectodermal and mesodermal

  • mesodermal and endodermal


A.

all mesodermal

Kidney and ureter in Rana tigrina is developed from mesodermal layer.

Embryonic cells differentiate at an early stage and form an outer layer of cells, the ectoderm and an inner layer the endoderm. At the later stage, the mesoderm is formed and these three germ layers give rise to all the tissues of the developing embryo.


49.

Which of the following plant yields oil and fibre both ?

  • Cocos nucifera

  • Eucalyptus

  • Brassica campestris

  • Euphorbia hirta


A.

Cocos nucifera

Coconut (Cocos nucifera) is a plant which yields oil and fibre both. Coconut oil is used as cooking oil as well as hair oil.


50.

The plant ash is an indication of :

  • organic matter of plant

  • waste product

  • mineral salts absorbed by plants

  • none of these


C.

mineral salts absorbed by plants

The ash that is left after burning any dry part of the plant in a crucible, contains only mineral elements and is called plant ash. If dried plant parts are heated in silica crucible at 600°C, all organic substance vaporize and the remaining plant ash contains only inorganic substances or absorbed mineral elements.