15584.Thorn of Bougainvillea and tendril of cucurbita are examples of:
Homologous organs
Analogous organs
Retrogressive evolution
Vestigial organs
15585.Identify the plant parts whose transverse sections show a clear and prominent pith.
Dicot stem and monocot stem
Dicot stem and dicot root
Dicot root and monocot root
Dicot stem and monocot root
15586.Ground tissue includes:
All tissues except epidermis and vascular bundles
All tissues external to endodermis
All tissues internal to endodermis
Epidermis and cortex
15588.In a dicotyledonous stem, the sequence of tissues from the outside to the inside is:
Phellem-phloem-endodermis-pericycle
Phellem-pericycle-endodermis-phloem
Pericycle-phellem-endodermis-phloem
Phellem-endodermis-pericycle-phloem
15589.As secondary growth proceeds, in a dicot stem, the thickness of
sapwood increases
heartwood increases
both sapwood and heartwood increases
both sapwood and heartwood remains the same
15590.Arrange the following plants in ascending order based on the number of xylem strands in their roots :
(I) Trapa
(II) Pisum
(III) Castanea
(IV) Nicotiana
II, IV, III, I
III, IV, II, I
IV, III, I, II
I, IV, II, III
15591.Read the following lists and select the correct option.
| List – I | List – II |
|---|---|
| A. Extrafloral Nectaries | I. Achras |
| B. Schizogenous cavities | II. Tropaeolum |
| C. Laticiferous ducts | III. Passiflora |
| D. Hydathodes | IV. Eucalyptus |
| V. Pinus |
A - III, B - I, C - II, D - IV
A - II, B - I, C - III, D - IV
A - III, B - V, C - I, D - II
A - V, B - II, C - I, D - III
15592.Which one of the following is the correct sequence of tissues present in dicot stem during secondary growth?
Primary cortex, secondary cortex, phellogen, cork
Cork, primary cortex, secondary cortex, phellogen
Phellogen, cork, primary cortex, secondary cortex
Secondary cortex, cork, phellogen primary cortex