1. all tissues except epidermis and vascular bundles
2. epidermis and cortex
3. all tissues internal to endodermis
4. all tissues external to endodermis
1. mitochondria
2. endoplasmic reticulum
3. chloroplasts
4. cytoskeleton
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
Palisade parenchyma is absent in leaves of:
1. Sorghum
2. mustard
3. soybean
4. gram
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 |