The balloon-shaped structures called tyloses

You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
1. Secondary xylem
2. Secondary phloem
3. Protoxylem
4. Cortical cells

The chief water conducting elements of xylem in gymnosperms are

1. vessels

2. fibres

3. transfusion tissue

4. tracheids

A common structural feature of vessel elements and sieve tube elements is :-

1. thick secondary walls

2. pores on lateral walls

3. presence of P-protein

4. enucleate condition

Which of the following are true

A. Vessels are multicellular with narrow lumen

B. Tracheids are multicellular with narrow lumen

C. Vessels are unicellular with wider lumen

D. Tracheids are unicellular with narrow lumen

Vessels are found in

A. All angiosperms and some gymnosperms

B. Most of angiosperms and few gymnosperms

C. All angiosperms, all gymnosperms and some pteridophyta

D. All pteridophyta

Tracheids, vessels, xylem fibres and xylem parenchyma are components of
1. Simple tissue
2. Xylem
3. Sclereids
4. Pith

Elongated cells with thick and lignified walls and tapering ends is a characteristic feature of
1. Xylem parenchyma
2. Xylem fibres
3. Tracheids
4. Vessels

Dead cell without protoplasm is ___________.
1. Sclerenchyma
2. Tracheids
3. Parenchyma
4. Both A and B

In flowering plants which of the following are main water transporting element
1. Tracheids
2. Vessels
3. Both A and B
4. None of the above