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  4. Q:28

Which of the following is true for nucleolus?

It takes part in spindle formation
It is a membrane-bound structure
Larger nucleoli are present in dividing cells
It is a site for active ribosomal RNA synthesis
Explanation:

Nucleolus is a non membranous structure and is a site of r-RNA synthesis.
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The stage during which separation of the paired homologous chromosomes begins is

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Casparian strips occur in

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Pneumatophores occur in

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Which of the following statements is correct?

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Match the items given in Column I with those in Column II and select the correct option given below:

Column IColumn II
a. Herbarium(i) It is a place having a collection of preserved plants and animals
b. Key(ii) A list that enumerates methodically all the species found in an area with brief description aiding identification
c. Museum(iii) Is a place where dried and pressed plant specimens mounted on sheets are kept
d. Catalogue(iv) A booklet containing a list of characters and their alternates which are helpful in identification of various taxa.

a b c d

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Oxygen is not produced during photosynthesis by

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Which of the following elements is responsible for maintaining turgor in cells?

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Which of the following is a secondary pollutant?

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