Anatomy of Flowering Plants

Given below is the diagram of a stomatal apparatus. In which of the following all the four parts labelled as A, B, C and D are correctly identified? [Figure]

1. A Epidermal cell, B Subsidiary cell, C Stomatal aperture, D Guard cell
2. A Subsidiary cell, B Epidermal cell, C Guard cell, D Stomatal aperture
3. A Guard cell, B Stomatal aperture, C Subsidiary cell, D Epidermal cell
4. A Epidermal cell, B Guard cell, C Stomatal aperture, D Subsidiary cell

Heartwood differs from sapwood in –

1. Having dead and non-conducting elements
2. Being susceptible to pests and pathogens
3. Presence of rays and fibres
4. Absence of vessels and parenchyma

Which one of the following is not a lateral meristem ?

1. Interfascicular cambium
2. Intercalary meristem
3. Intrafascicular cambium
4. Phellogen

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