NEET questions
18092 published questions with worked solutions.
- In dicot leaf, each vascular bundle is surrounded by a sheath of compactly arranged cells called bundle sheath. Bundle sheath...
- In dicot leaves, stomata are generally present on the lower epidermis (hypostomatic), whereas in monocot leaves, they are present...
- In an isobilateral (equifacial) leaf, vascular bundles are conjoint and collateral. Xylem lies towards the
- Increase in girth or thickness of the axis of a plant, taking place due to the activity of lateral meristems like vascular...
- Intrafascicular (fascicular) cambium is present
- The cambial ring present between primary xylem and primary phloem becomes active and begins to cut off new cells towards both the...
- During secondary growth in a dicot stem, intrafascicular cambium and interfascicular cambium get connected to form a complete...
- Fusiform initials of the vascular cambium divide to form
- Ray initials of the vascular cambium are
- In winter, the cambium is less active and forms fewer xylary elements that have narrow vessels; this wood is called
- The spring wood is lighter in colour and has a lower density, whereas the autumn wood is darker and has a higher density. The two...
- An increase in the number of annual rings in a tree trunk, counted in a transverse section, corresponds to
- Heartwood (duramen), the central wood of an old stem, is dark coloured, and living cells are absent here. The tracheary elements...
- Xylem (wood) consists of four types of cells, viz. tracheids, vessels, xylem (wood) parenchyma and xylem (wood) fibres. Phloem...
- In order to provide increase in girth and prevent rupturing of the outer ground tissues due to the formation of secondary...
- The cells of the phellogen divide periclinally to produce phellem (cork) on the outer side and secondary cortex (phelloderm) on...
- Bark is a non-technical term that refers to all tissues exterior to the vascular cambium, viz.
- Dicot stems produce a cork cambium (phellogen) in the outer cortical cells, dividing periclinally to produce phellem (cork) on...
- The periderm, consisting of phellem, phellogen and phelloderm, is a tissue of
- During secondary growth in a dicot root, the pericycle layer, either directly or after a few divisions, becomes converted into a...