Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

The standard petal of papilionaceae corola is also called

  • pappus

  • vexillum

  • corona

  • corona


B.

vexillum

The large upper petal in Papilionaceae is known as vexillum. 

1245 Views

32.

Emerson's enhancement effect and red drop have instrumental in the discovery of

  • two photosystems operating simultaneously

  • photophosphorylation and cyclic electron transport

  • oxidative phosphorylation

  • oxidative phosphorylation


A.

two photosystems operating simultaneously

Emerson performed photosynthetic experiment on Chlorella. The enhancement effect is due to the presence of two photosystems PsI and PSII. 

3308 Views

33.

In a chloroplast the highest number of protons are found in

  • lumen of thylakoids

  • inter membrane space

  • antennae complex

  • antennae complex


A.

lumen of thylakoids

Proton concentration is higher in the lumen of thylakoid due to photolysis of water. Hpumping and NADP reductase activity which occurs in stroma of the chloroplast.

1836 Views

34.

Stems modified into flat green organs performing the functions of leaves are known as

  • phyllodes

  • phylloclades

  • scales

  • scales


B.

phylloclades

Phylloclades are aerial modified stem, in which stem becomes thick, fleshy succulent, green and perform the function of photosynthesis. The leaves are reduced to spines in this.

1845 Views

35.

Which of the following is not a characteristic feature during mitosis in somatic cells?

  • Disappearance of nucleolus

  • Chromosome movement

  • Synapsis

  • Synapsis


C.

Synapsis

Synapsis is pairing of homologous chromosomes. It occurs during zygotene stage of meiosis

1308 Views

36.

In meiosis crossing over is initiated at

  • leptotene

  • zygotene

  • diplotene

  • diplotene


D.

diplotene

Crossing over takes place in pachytene stage. 

1276 Views

37.

Select the correct statement

  • Salvinia, Gingko and Pinus all are gymnosperm

  • Sequoia is oneis one ot the talles trees

  • The leaves of gymnosperm are not well adapted to extremes of climate

  • The leaves of gymnosperm are not well adapted to extremes of climate


B.

Sequoia is oneis one ot the talles trees

Sequoia is one of the tallest tree species known as redwood tree. 

1383 Views

38.

Spindle fibres attach on to

  • kinetochore of the chromosome

  • centrosome of the chromosome

  • kinetosome of the chromosome

  • kinetosome of the chromosome


A.

kinetochore of the chromosome

Spindle fibres attach to kinetochores of chromosomes during cell division. They help the chromosomes to get separated to the two daughter cells, towards opposite poles. 

1119 Views

39.

Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature?

  • The first word in biological name represents the genus name and the second is a specific epithet

  • The names are written in Latin and are Italicised

  • When written by hand, the names are to be underlined

  • When written by hand, the names are to be underlined


D.

When written by hand, the names are to be underlined

Biological names originate from Latin laguages. 

1517 Views

40.

Blood pressure in the pulmonary artery is

  • more than that in the carotid

  • more than that in the pulmonary vein

  • less than that in the Vena cava

  • less than that in the Vena cava


B.

more than that in the pulmonary vein

Blood pressure in different blood vessels:
Artery > arteriole > capillary > venule> vein (Vena cava)

2769 Views