321. Cotton is obtained from

A Epidermal tissue system
B Ground tissue system
C Vascular tissue system
D Meristematic tissue system
Answer :   Epidermal tissue system
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322. In xylem, fibres give strength to

A Vessels
B Tracheids
C Parenchyma
D Storage tissue
Answer :   Vessels
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323. The trees growing in deserts will

A Show alternate rings of xylem and sclerenchyma
B Show distinct annual rings
C Not show distinct annual rings phloem formed by the activity of cambium
D Have only conjunctive tissue and phloem formed by the activity of
Answer :   Not show distinct annual rings phloem formed by the activity of cambium
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324. In land plants, the guard cells differ from other epidermal cells in having:

A cytoskeleton
B mitochondria
C endoplasmic reticulum
D chloroplasts
Answer :   chloroplasts
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325. Articulated latex vessels occur in

A Hevea
B Calotropis
C Euphorbia
D Tamarindus
Answer :   Hevea
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326. Regeneration of damaged growing grass following grazing is largely due to:

A Secondary meristem
B Lateral meristem
C Apical meristem
D Intercalary meristem
Answer :   Intercalary meristem
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327. Parenchyma with large air spaces is

A Stellate parenchyma
B Aerenchyama
C Angula parenchyma
D Prosenchyma
Answer :   Aerenchyama
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328. Secondary growth is the production of

A New tissue from intercalary meristem
B New conduction cells
C New tissue form lateral meristem
D New ground cells
Answer :   New tissue form lateral meristem
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329. The leaves having equal stomata on both the surface are called as

A Amphistomatic
B Hypostomatic
C Epistomiatic
D Automatic
Answer :   Amphistomatic
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330. Which one increases due to cambium

A Length
B Width
C Circumference
D None of the above
Answer :   Circumference
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