Anatomy of Flowering Plants · Question 61

The chief water conducting elements of xylem in gymnosperms are :

1. Fibres
2. Transfusion tissue
3. Vessels
4. Tracheids

In barley stem vascular bundles are -

1. Closed and scattered
2. Closed and radial
3. Open and in a ring
4. Open and scattered

Palisade parenchyma is absent in leaves of -

1. Mustard
2. Sorghum
3. Soybean
4. Gram

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is -

1. Maturing
2. Widening
3. Elongating
4. Differentiating

Anatomically fairly old dicotyledonous root is distinguished from the dicotyledonous stem by :

1. Absence of secondary phloem
2. Presence of cortex
3. Position of protoxylem
4. Absence of secondary xylem

Vascular tissues in flowering plants develop from:

1. plerome
2. periblem
3. phellogen
4. dermatogen

The length of different internodes in a culm of sugarcane is variable because of:

1. shoot apical meristem
2. position of axillary buds
3. size of leaf lamina at the node below each internode
4. intercalary meristem

Passage cells are thin-walled cells found in:-

1. Endodermis of roots facilitating rapid transport of water from cortex to pericycle
2. Testa of seeds to enable emergence of growing embryonic axis during seed germination.
3. Phloem elements that serve as entry points for substances for transport to other plant parts
4. Central region of style through which the pollen tube grows towards the ovary.

For a critical study of secondary growth in plants, which one of the following pairs is suitable?

1. Deodar and fern
2. Wheat and maiden hair fern
3. Sugarcane and sunflower
4. Teak and pine

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

1. Enucleate condition
2. Presence of p-protein
3. Thick secondary walls
4. Pores on lateral wall