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NEET Biology Solved Question Paper 2007

Multiple Choice Questions

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

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

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

n = 21 and x = 7

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

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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

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.

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

mesophyll
bundle sheath
phloem
epidermis

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.

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Which of the following is a slime mould?

Rhizopus
Physarum
Thiobacillus
Anabaena

Physarum

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

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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

Floating ribs - 2 pairs

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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

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.

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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

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.

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