Q22 of 360 Page 110

How are chromatin, chromatid and chromosome related to each other.

Chromatin is a tangled fibrous mass made up of DNA and protein. The chromatin material condenses to form chromosomes during cell division. Chromosomes are composed of DNA and protein. DNA molecules contain the information necessary for constructing and organising cells. Functional segments of DNA are called genes. A chromosome consists of two identical and spirally coiled threads called sister chromatids. They are joined at a constriction called centromere.


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20

Which kind of plastid is more common in (a) Root of the plant, (b) Leaves of the plant, (c) Flowers and fruits,

 21

Who do plant cells posses large sized vacuole?

 23

What are consequences of the following conditions?

(a) A cell having higher water concentration than the surrounding medium.


(b) A cell containing low water concentration than the surrounding medium.


(c) A cell having equal water concentration to its surrounding medium.

 24

Draw plant cell and label the parts which

(a) Determine function and development of the cell.


(b) Provides resistance to microbes and to withstand hypotonic external medium without injury.


(c) Packages materials coming from the endoplasmic reticulum.


(d) Is a fluid contained inside the nucleus.


(e) Is site for many biochemical reaction necessary to sustain life.