Class 11 Biology · Chapter 8 · Test 3
Xylem and Phloem Transport
38 MCQs. This part covers the structure of xylem and phloem, the TACT mechanism of water movement, and the structure of phloem. It also covers translocation of sugars and the pressure flow theory, along with the related exercise MCQs.
38 questions · 25 min · 38 marks
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Sample questions
The first 5 of 38. Try each one, then tap to see the answer.
Question 1
Xylem is the vascular tissue that carries:
- AWater and minerals
- BOnly sugars
- COnly hormones
- DOnly oxygen
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Answer: A
Xylem carries water and dissolved minerals and also provides mechanical support.
Question 2
Xylem comprises of:
- ATracheids, vessels, xylem fibres and xylem parenchyma
- BSieve tubes, companion cells and fibres
- CGuard cells and epidermis
- DCambium and cork only
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Answer: A
Xylem comprises tracheids vessels xylem fibres and xylem parenchyma.
Question 3
Tracheids have thick walls made of:
- ALignin
- BChitin
- CStarch
- DProtein
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Answer: A
Tracheids are elongated cells with thick lignified walls.
Question 4
Tracheids are linked to each other by:
- ABordered pits
- BSieve plates
- CPlasmodesmata only
- DStomata
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Answer: A
Bordered pits enable lateral movement of water between tracheids.
Question 5
Compared to tracheids vessels are:
- AShorter and broader
- BLonger and narrower
- CEqual in size
- DAbsent in plants
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Answer: A
Vessels are shorter and broader than tracheids.
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