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Consider the following statement and cho...

Consider the following statement and choose the correct option
(i) The thread like cytoplasmic strands, running from one cell to other is known as plasmodesmata
(ii) Xylem and phloem constitute the vascular bundle of the stem
(iii)The first form xylem elements are described as metaxylem
(iv) Radial vascular bundles are mainly found in the leaves

A

II is true, but I, Ill and IV are false

B

lll is true, but I, II and IV are false

C

IV is true, but I, ll and lll are false

D

I and II are true, but Ill and IV are false

Text Solution

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The correct Answer is:
D
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Consider the following statement and choose the correct option The thread like cytoplasmic strands, running from one cell to other is known as plasmodesmata (ii) Xylem and phloem constitute the vascular bundle of the stem (iii)The first form xylem elements are described as metaxylem (iv) Radial vascular bundles are mainly found in the leaves

Read the following statements and select the correct option. Statement-1: Anatomically, all the tissues present on the inner side of endodermis such as pericycle, vascular bunbles and pitch constitute the stele. Statement-2: Eustele is the stele in which vasuclar bundles are arragned in the form of a ring as present in dicot stems.

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Which of the following statements are correct? I. In amphicribral vascular bundle, xylem lying in centre is surrounded by a ring of phloem. II. In amphivasal vascular bundle, phloem lying in centre is surrounded by xylem. III. In amphivasal vascular bundle, xylem lying in centre is surrounded by phloem. IV. In amphicribral vascular bundle, phloem lying in centre is surrounded by ring of xylem.

Consider the following four statements (I - iv) and select the correct option stating which ones are true (T) and which ones are false (F). (i) Formation of oxyhaemoglobin occurs on alveolar surface. (ii) During gaseous exchange the gases diffuse from high particle pressure to low partial pressure. (iii) Carbon dioxide cannot be transporteed width haemoglobin. (iv) Earthworm respires through parapodia.

Read the following statements and choose the correct answer. (i) Gap junctions cement adjacent cells together. (ii) Areolar tissue contains fibroblasts , macrophages and mast cells. (iii) Tight junctions facilitate the cells to communicate with each other (iv) Adhering junctions help to stop substances from leaking across tissues (v) Cells of connective tissue except blood secrete fibres of structural proteins called elastin.

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