Q. No.
The cork cambium, cork and secondary cortex are collectively called:
1. phellogen
2. periderm
3. phellem
4. phelloderm
1. phellogen
2. periderm
3. phellem
4. phelloderm
The chief water conducting elements of xylem in gymnosperms are:
| 1. | vessels | 2. | fibres |
| 3. | transfusion tissue | 4. | tracheids |
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is:
1. maturing
2. elongating
3. widening
4. differentiating
In barley stem, vascular bundles are:
1. open and scattered
2. closed and scattered
3. open and in a ring
4. closed and radial
Anatomically, fairly old dicotyledonous root is distinguished from the dicotyledonous stem by:
1. absence of secondary xylem
2. absence of secondary phloem
3. presence of cortex
4. position of protoxylem
Guard cells help in:
| 1. | protection against grazing |
| 2. | transpiration |
| 3. | guttation |
| 4. | fighting against infection |
Passage cells are thin-walled cells found in:
| 1. | endodermis of roots facilitating rapid transport of water from cortex to pericycle |
| 2. | phloem elements that serve as entry points for substances for transport to other plant parts |
| 3. | testa of seeds to enable emergence of growing embryonic axis during seed germination |
| 4. | central region of style through which the pollen tube grows towards the ovary |
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
| 1. | mitochondria |
| 2. | endoplasmic reticulum |
| 3. | chloroplasts |
| 4. | cytoskeleton |
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