Which one is true regarding xylem?
1. vessels are absent in gymnosperms
2. cells of vessel are called vessel members
3. tracheid and vessel lack protoplasm
4. All of these
The type of primary xylem when protoxylem lies towards the pith is known as
1. endarch
2. exarch
3. endoexarch
4. Both (1) and (3)
How many elements of the xylem are dead
1. four
2. three
3. two
4. one
Sclerenchymatous fibres are
1. thick walled, elongated and pointed cells
2. contains simple and bordered pits
3. smallest cells in plant body
4. All of these
In grasses leaves are exposed when bulliform cells becomes_________ and leaves curl inwards when they are _________
(1)flaccid ,turgid
(2)plasmolysed, turgid
(3)turgid, flaccid
(4)Both B and A
Which one is true for dicot leaf
1. veins thickness vary
2. reticulate venation is present
3. all vascular bundles are similar in size
4. Both 1 and 2
The size of the vascular bundles are dependent on the size of the
1. veins
2. air cavities
3. chloroplast
4. All of the above
Midrib and veins of the represent
(1)vascular bundle
(2) cortex
(3)palisade parenchyma
(4)spongy parenchyma
Which of the following is true for palisade parenchyma?
1. adaxially placed
2. elongated cells
3. vertically and parallely placed
4. All of the above
The tissues present between the adaxial and abaxial epidermis are
(1)mesophyll
(2)chlorophyll
(3)vascular bundle
(4)Both A and C