Passage cells are thin-walled cells found in from Biology NEET

Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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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

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


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.

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2.

Opening of floral buds into flowers, is a type of

  • autonomic movement of locomotion

  • autonomic movement of variation

  • paratonic movement of growth

  • paratonic movement of growth

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3.

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

  • mesophyll

  • bundle sheath

  • phloem

  • phloem

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4.

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

  • Floating ribs - 2 pairs

  • Collar bones - 3 pairs

  • Salivary glands - 1 pair

  • Salivary glands - 1 pair

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5.

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

  • casuarina equisetifolia

  • crotalaria juncea

  • cycas revoluta

  • cycas revoluta

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6.

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 = 14

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7.

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

  • Fucus, Marsilea and Calotropis

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8.

Increased asthmatics attacks in certain seasons are related to

  • hot and humid environment

  • eating fruits preserved in tin containers

  • inhalation of seasonal pollen

  • inhalation of seasonal pollen

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9.

Which of the following is a slime mould?

  • Rhizopus

  • Physarum

  • Thiobacillus

  • Thiobacillus

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10.

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

  • salivation of mouth at the sight of delicious food

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