L10

Question 1

In natural environments drought stress usually arises due to …

Answer 1

To lack of rainfall.

Question 2

Drought stress after flowering is resulting loss in how many percentage?

Answer 2

50% yield loss

Question 3

the ability to function while dehydrated or drought tolerance at low water potential

Answer 3

desiccation tolerance

Question 4

the ability to maintain tissue hydration or drought tolerance at high water potential

Answer 4

Desiccation postponement

Question 5

where the plants avoid drought by completing life cycles before the onset of a dry period to sustain some reproduction

Answer 5

drought escape

Question 6

considered a major mechanism for improving water uptake under drought conditions

Answer 6

increased depth and density of roots

Question 7

is recognized as an index for whole plant water status.

Answer 7

Leaf water potential (LWP)

Question 8

is closely related to cell size and may strongly reflect the balance between water supply to the leaf and transpiration.

Answer 8

Relative water content (RWC)

Question 9

specialized cells performing gas exchange in plants, account for water loss through transpiration.

Answer 9

Stomata

Question 10

is involved in stomatal closure and appears to trigger stomatal closure even before significant decline in water potential occurs

Answer 10

hormone ABA

Question 11

Nerium oleander, Ficus spp., and modified leaves of certain plants (pine needles), avoid drought by……

Answer 11

sunken stomata

Question 12

are located in a depression, creating a more humid microclimate in the boundary layer

Answer 12

guard cells

Question 13

is the waxy covering of the plant cuticle that renders a dull-white or bluish-green cast referred to as bloom in crops such as sorghum and wheat

Answer 13

Glaucousness

Question 14

is considered as an adaptive trait for drought tolerance in soybean.

Answer 14

Leaf pubescence density

Question 15

reflect excess radiation and reduce epidermal conductance

Answer 15

Pubescent hairs

Question 16

is defined as the active accumulation of organic solutes intracellularly in response to an increasing water deficit.

Answer 16

Osmotic adjustment (OA)

Question 17

is considered a useful trait because it provides a means for maintaining cellular turgor.

Answer 17

OA