Anatomy of Flowering Plants · Question 64

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

In a woody dicotyledonous tree, which of the following parts will mainly consist of primary tissues ?

1. Shoot tips and root tips
2. Flowers, fruit and leaves
3. Stem and root
4. All parts

The apical meristem of the root is present

1. In all the roots
2. Only in tap roots
3. Only in adventitious roots
4. Only in radicles

Diffuse porous wood is characteristic of those plants which are growing in :

1. Tropics
2. Temperate climate
3. Alpine region
4. Cold winter regions