Multiple Choice QuestionsPassage 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.
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
In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of
mesophyll
bundle sheath
phloem
phloem
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
Which of the following is a flowering plant with nodules containing filamentous nitrogen-fixing micro-organism
casuarina equisetifolia
crotalaria juncea
cycas revoluta
cycas revoluta
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
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
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
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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