Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The most impotant function of the trichomes is:
Trichomes are epidermal hairs on the sterm and help in prevention of water loss due to transpiration.
Which of the following has unevenly thick cell wall, has a primary wall (cellulose) and a secondary wall (hemicellulose or pectin), and is a simple, living, primarily mechanical tissue of the plant body?
Answer 2. Collenchyma cells are much thickened at the corners due to a deposition of cellulose, hemicelluloses and pectin.
Intercalary meristems are primary meristems because:
I. They appear early in life of a plant.
II. They contribute to the formation of the primary plant body.
Read page 85 XI NCERT
What is the number of correct statements amongst the following regarding phloem tissue of plants?
I. Gymnosperms lack albimunous cells and
sieve cells.
II. The companion cells are specialized
parenchymatous cells.
III. Phloem parenchyma is absent in most of the
monocotyledons.
IV. Phloem fibers are generally absent in the
primary phloem.
Statement I is incorrect. Read page 88 of class XI NCERT
Identify the wrong statement in context of heartwood.
(c) Heartwood also called duramen is the central dead wood of trees. It comprises of dead, lignified cells containing organic compounds, eg. tannins or other substances. These substances make it darker in colour and aromatic. Heartwood is strong durable and resistant to decay. It does not conduct water and minerals because of the presence of dead elements. Thinking Process The conduction of water and
minerals is carried out by sapwood, because it contains living cells.
Which of the following facilitates opening of stomatal aperture :-
(c) Stomata are tiny pore complexes. Each stomata is surrounded by two specialised green epidermal cells called guard cells.The opening of the stoma is facilitated by the orientation of the microfibril in the cell walls of the guard cells.Cellulose microfibrils are oriented radially rather than longitudinally making it easier for the stoma to open.
Which of the following is made up of dead cells?
(c) Phellem or cork is a tissue formed on the outer side of cork cambium. It is composed of dead cells.
The cell wall become impermeable due to suberisation.
The vascular cambium normal gives rise to.
(c) Vascular cambium located between xylem and phloem in the stems and roots of vascular plants- It produces secondary xylem towards the pith and secondary phloem towards the bark. Phellogen is made of narrow thin-walled and nearly rectangular cells. phellogen cuts off cells on both sides. The outer cells differentiate into cork or phellem while inner cells differentiate into secondary cortex or phelloderm. The phellogen, phellem and phelloderm are collectively known as periderm.
Which one gives the most valid and recent explanation for stomatal movements?
The opening and closing of stomata are caused by influx and efflux of potassium ions (Kâº). The increase of K⺠results in opening of stoma and decrease of K⺠causes closing of stoma. The turgidity of guard cells induces to open the pores of stomata found on the surface of leaves.
You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
The presence of protoxylem helps distinguish a dicot stem from a dicot root. Protoxylem elements are arranged in an exarch pattern (towards the center) in roots, while in stems, they are arranged in an endarch pattern (towards the periphery).
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