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211. Callus is

A. Material used in healing in phloem

B. Secondary tissue developed by woody plants

C. An undifferentiated mass of cells

D. All the above

Explanation:

212. Dark field microscope was invented by

A. Zsigmondy

B. Zernicke

C. Merten et al

D. Caspersson

Explanation:

213. Given below are assertion and reason. Assertion Specialisation of cells is advantageous to organisms. Reason It increases operational efficiency

A. Both are true with reason being correct explanation

B. Both true but reason is not correct explanation

C. Assertion is true but reason is wrong

D. Both are wrong

Explanation:

214. Who first saw and described a live cell

A. Mathias Schleiden

B. Theodore Schwann

C. Anton von Leeuwenhoek

D. Rudolf Virchow

Explanation:

215. Which of the following statement are false? a) Most cells are tiny with volume range of 1 – 100 nm³ b) Some cells have microvilli to increase the absorptive surface area c) All cells arise from pre-existing cells d) In plants, translocation of solutes is performed by xylem vessels and tracheids e) According to cell theory, all cells arise from abiotic material

A. a, c and e are false

B. a, d and e are false

C. b, c and d are false

D. c, d and e are false

Explanation:

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