Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Passage cells are thin-walled cells found in

  • endodermis of roots facilitating rapid transport of water from cortex to pericycle

  • phloem elements that serve as entry points for substance for transport to other plant parts

  • testa of seeds to enable emergence of growing embryonic axis during seed germination

  • central region of style through which the pollen tube grows towards the ovary


A.

endodermis of roots facilitating rapid transport of water from cortex to pericycle

In roots, endodermis is the innermost layer of cortex. Some of the endodermal cells present opposite to the xylem patches are thin walled and are called passage cells or transfusion cells. Passage cells help in transfer of water and dissolved salts from cortex directly into the xylem and ultimately to the pericycle.

1666 Views

2.

In the hexaploid wheat, the haploid (n) and basic (x) numbers of chromosomes are

  • n = 7  and x = 21

  • n = 21 and x = 21

  • n = 21  and x = 14

  • n = 21  and x = 7


D.

n = 21  and x = 7

The basic (x) number of chromosome of hexaploid wheat is 7  and haploid (n) number is 21.

893 Views

3.

Increased asthmatics attacks in certain seasons are related to

  • hot and humid environment

  • eating fruits preserved in tin containers

  • inhalation of seasonal pollen

  • low temperature 


C.

inhalation of seasonal pollen

Asthma is a respiratory disorder. It is caused by foreign allergens and dust particles present in the air passing through it, the pollen grains present in air can cause asthmatic attacks in certain seasons. 

450 Views

4.

In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of

  • mesophyll

  • bundle sheath

  • phloem

  • epidermis


A.

mesophyll

The oxalic acid is reduced to malic acid in mesophyll cells, from chloroplast of mesophyll cells the malic acid is transferred to the chloroplast of bundle sheath cells where it is decarboxylated to form CO2 and pyruvic acid. 

640 Views

5.

Which of the following is a slime mould?

  • Rhizopus

  • Physarum

  • Thiobacillus

  • Anabaena


B.

Physarum

The genus Physarum with about 100 species in the largest and best-studied slime mould in the class Myxomycetes.

636 Views

6.

In human body, which one of the following is anatomically correct?

  • Floating ribs - 2 pairs

  • Collar bones - 3 pairs

  • Salivary glands - 1 pair

  • Cranial nerves - 10 pairs


A.

Floating ribs - 2 pairs

478 Views

7.

Opening of floral buds into flowers, is a type of

  • autonomic movement of locomotion

  • autonomic movement of variation

  • paratonic movement of growth

  • autonomic movement of growth


D.

autonomic movement of growth

Opening of floral buds into flower is a type of autonomic movement of growth (Nastic movement). This is non-directional movement in which the response is determined by the structure of the responsive organ and not to the direction of stimulus. Greater growth on one side causes the organ to bend to the opposite side. 

563 Views

8.

Which of the following is an example of negative feedback loop in humans?

  • constriction of skin blood vessels and contraction of skeletal muscles when it is too cold

  • secretion of tears after falling of sand particles into the eye

  • salivation of mouth at the sight of delicious food

  • secretion of sweat glands and constriction of skin blood vessels when it is too hot


A.

constriction of skin blood vessels and contraction of skeletal muscles when it is too cold

Skin blood vessels constrict and skeletal muscles contract due to cold is an example of negative feedback mechanism of homeostatis.

479 Views

9.

Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing micro-organism

  • casuarina equisetifolia

  • crotalaria juncea

  • cycas revoluta

  • cicer arietinum


A.

casuarina equisetifolia

The Casuarina tree has nitrogen fixing root nodules that harbor a filamentous streptomycete like nitrogen fixing organism called Frankia.

542 Views

10.

Flagellated male gametes are present in all the three of which one of the following sets?

  • Anthoceros, Funaria and Spirogyra

  • Zygnema, Saprolegnia and Hydrilla

  • Fucus, Marsilea and Calotropis

  • Riccia, Dryopteris and Cycas


D.

Riccia, Dryopteris and Cycas

Flagellated male gametes are present in Riccia, Dryopteris and Cycas.

721 Views