How many pairs of homologous chromosomes are present in pisum sativum?

A. Seven pairs

B. Eight pairs

C. Nine pairs

D. Ten pairs

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Lignin could not be expected in which part of the plant cell wall:

A. Secondary cell wall

B. Middle lamella

C. Cell membrane

D. Primary cell wall

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Which statement about thylakoids in eukaryotes is not correct?

A. Thylakoids are assembled into stacks

B. Thylakoids exist as a maze of folded membranes

C. The space sorrounding thylakoids is called storma

D. Thylakoids contain chlorophyll

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The usual position of the two centrioles in relation to each other is at right angle in:

A. Higher plant cell

B. Lower plant cell

C. Animal cells

D. Both (a) and (b)

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For callus formation, auxin and cytokinin are required in which ratio?

A. Balanced

B. Only cytokinin required

C. Low auxin, very high cytokinin

D. Only auxin

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