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PSS 3323 TTU Exam 1 Questions & Answers 2024/2025
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PSS 3323 TTU Exam 1 Questions & Answers 2024/2025 Meristem - ANSWERSare the regions of plant growth and cell division and make new cells for P and S growth. (Primary growth increases the length of roots and shoots. Secondary growth increases the size/girth of woody stems and roots.) Apical ...

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  • August 13, 2024
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  • 2024/2025
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PSS 3323 TTU Exam 1 Questions &
Answers 2024/2025

Meristem - ANSWERSare the regions of plant growth and cell division and make new cells for P and S
growth. (Primary growth increases the length of roots and shoots. Secondary growth increases the
size/girth of woody stems and roots.)



Apical - ANSWERSAt the tips (apices; singular apex) of roots and stems. Often enclosed by leaves (shoot)
or protected by root cap (roots)



Axillary - ANSWERSLocated in leaf junctions, produce branches or flowers



Intercalary - ANSWERSLocated between less mature meristematic tissue and more mature M.T.



Lateral - ANSWERSForm a cylinder around stems and roots in woody plants; produce secondary growth



Ground Tissue - ANSWERSstandard plant tissue



Epidermal Tissue - ANSWERSOuter covering



Vascular Tissues - ANSWERSplumbing



Roots - ANSWERSanchor plant in soil, absorb water and nutrients, storage



Fibrous - ANSWERSMass of similarly sized roots



Taproot - ANSWERSprimary roots that grow longer and thicker than secondary roots. Some taproots are
carb storage organs

, Where are the zones of growth and water absorption for roots? - ANSWERS• Growth and Entrance of
water and minerals occurs behind the root tips (at or near root tips)

• Growth is region of elongation and region of differentiation



What type of cells are root hairs, and what role do they play? - ANSWERS- Thin walled elongated cells

•They make direct contact with the soil and are surfaces through which most of the water and mineral
elements enter the roots



Stems - ANSWERSprovide vascular connections (carbs and water) from roots to leaves and determine the
distribution of leaves.



stolons - ANSWERS-aboveground horizontal



rhizomes - ANSWERS-underground horizontal



tillers - ANSWERS-originate from axillary buds, twining shoots and tendrils



bulbs - ANSWERS-have compact unelongated stems with fleshy underground leaves,



petioles - ANSWERS-stalks that attach the stem and leaf.



What is a sessile leaf? - ANSWERS• Have no petiole.



Leaf adaptations to environment. - ANSWERS- Some plants have varying petiole lengths to maximize leaf
interception of light

• Pubescent leaves-reflect light, repel insects, decrease air movement and transpiration

• Decrease surface-volume ratio (succulents)



Which factor most affects crop development rate? - ANSWERStemperature

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