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NEET 2022 > plant physiology > Flashcards

plant physiology Flashcards

1
Q

water is absorbed along with mineral solutes by the roots purely by

A

diffusion

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2
Q

mass flow of water occurs due to

A

adhesive or cohesive properties of water

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3
Q

the symplastic system is the system of

A

interconnected protoplast

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3
Q

the fungus provides water and minerals to the root i turn root provides

A

sugars and nitrogen containing compounds

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4
Q

———-% of water reaching the leaves is used in photosyenthesis and plant growth

A

less than 1 %

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5
Q

the upward flow of water through xylemin planrs can achieve fairly high rates up to ———

A

15m/hr

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6
Q

when will stoma close

A

when the guard cells become flaccid

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7
Q

————-are oriented radially than longitudinally making it ieasier for the stoma to open

A

cellulose microfibril

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8
Q

in ————-and ——— the lateral meristem vascular cambium coerk cambium appear later in the life

A

dicoteledonous plants and gymnosperms

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9
Q

single maize root apical meristem can give rise to more than ————new cells per hour

A

17500 cells per hour

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10
Q

cells in a watermelon may increase in size upto

A

3lakh 50 thousand times

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11
Q

meristamatic phase characteristics

A

rich in protoplasm
large conspicious nuclei
cells walls primary in nature
thin cellulosic abundant plasmodesmatal connections

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12
Q

elongation phase characteristics

A

increased vacuolation
cell enlargement
new cell wall deposition

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12
Q

maturation phase characteristics

A

attain max size (cell wall)

protoplasmic modification

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13
Q

—– is partly responsible for the water potentisl gradient in roots,and therefore for the uptake of water by osmosis

A

active uptale of ions

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14
Q

root endodermis because of the layer of —–has the ability to actively transport ions in one direction only

A

suberin

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15
Q

transport proteins of endodermal cells are —- where a plants adjust the quantity and types of solute that reach the xylem

A

control points

16
Q

forces generated by transpiration can create pressure sufficient to lift a xylem sized coloum of water over —–m high

A

130 m

17
Q

diffusion across small distamces ,substances move by —————and ————-supplimented by active transport

A

diffusion and by cystoplasmic streaming

18
Q

azotobacter and beijerinchia are

A

free living nitrogen fixing aerobic microbes

19
Q

rodospirillum is

A

anaerobic freeliving

20
Q

cysnobacteria is

A

freeliving nitrogen fixers

21
Q

frankia produce nitrogwn fixing nodules on the rooot of non leguminous plants eg

A

alnus

22
Q

rod shaped rhizobium has such relationship with the roots of several legumes such as

A

alfafa sweet pea sweet clover lentils garden pea broad bean clover beans

23
Q

—–and —–are freeliving in soil but as symboints cam fix atm nitrogen

A

rhizobium and frankia

24
Q

a watermelon has over— % water

A

92%

25
Q

most hebaceous plants have only about —-% fresh weight as dry matter

A

10-15%

26
Q

a mature corn absorbs almost –of water in a day

A

3L

27
Q

mustard plant absorbs water equal to its own weight in

A

5 hours

28
Q

mass flow occurs as a result of

A

pressure diff bet two points

29
Q

movement of a molecule across a typical plant cell (about 15 micrometer ) takes approximately

A

2.5 sec

30
Q

deficiency of actively mobilising element appears first in

A

older tissues

31
Q

chlorosis defieciency

A

n,k,mg,s,Mo,fe,zn,mn

32
Q

necrosis due to def of

A

ca,mg,cu,k

33
Q

inhibition of cell division

A

Mo,N,K,S

34
Q

DELAY FLOWERING

A

Mo,N,S

35
Q

weathering enrich the soil with

A

dissolved ions and inorganic salts

36
Q

methods like hydroponics require

A

purified water and mineral nutrients

37
Q

hydroponics success in commercial prod of vegetable such as

A

tomato
seedless cucumber
lettuce

38
Q

in facr more than ———-elements of 105 discovered so far are found in different plants

A

60

39
Q

there are technics that are able to detect the minerals even at a very low concentration of

A

10^-8g/ml

40
Q

macronutrients are generally present in plant tissues in large amounts like

A

in excess of 10mmole kg^-1

NEET 2022 (16 decks)

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