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Chapter 6: Tissues
Exercise & In-Text Questions & Answers

1What is a tissue?
Answer & Reference:
A tissue is a group of cells that are similar in structure and/or work together to perform a specific function. (Page 60)
2What is the utility of tissues in multi-cellular organisms?
Answer & Reference:
Tissues allow division of labour—different groups of cells perform specific functions efficiently (e.g., muscle for movement, nerve for conduction). (Page 60)
3Which of the two onions has longer roots? Why?
Answer & Reference:
Jar 1 (untouched) has longer roots because the apical meristem at the root tip is intact and actively dividing. (Page 61, Activity 6.1)
4Do the roots continue growing after removing tips?
Answer & Reference:
No, because the apical meristem (region of cell division) is removed. (Page 61)
5Why would tips stop growing in jar 2?
Answer & Reference:
Cutting the tip removes the apical meristem, so no new cells are produced for growth. (Page 61)
6Name types of simple tissues.
Answer & Reference:
Parenchyma, collenchyma, and sclerenchyma. (Page 62–63)
7Where is apical meristem found?
Answer & Reference:
At the growing tips of stems and roots. (Page 61)
8Which tissue makes up the husk of coconut?
Answer & Reference:
Sclerenchyma—dead cells with thick lignified walls. (Page 63)
9What are the constituents of phloem?
Answer & Reference:
Sieve tubes, sieve cells, companion cells, phloem parenchyma, and phloem fibres. (Page 64)
10Name the tissue responsible for movement in our body.
Answer & Reference:
Muscular tissue. (Page 67)
11What does a neuron look like?
Answer & Reference:
A neuron has a cell body with nucleus, dendrites (short branched parts), and an axon (long fibre). (Page 69, Fig. 6.12)
12Give three features of cardiac muscles.
Answer & Reference:
(i) Involuntary, (ii) cylindrical, branched, uninucleate cells, (iii) show rhythmic contraction. (Page 68)
13What are the functions of areolar tissue?
Answer & Reference:
Fills space between organs, supports internal organs, and helps in tissue repair. (Page 67)
14How are simple tissues different from complex tissues?
Answer & Reference:
- Simple: Made of one cell type (e.g., parenchyma).
- Complex: Made of >1 cell type working together (e.g., xylem). (Page 64)
15Differentiate parenchyma, collenchyma, sclerenchyma on the basis of their cell wall.
Answer & Reference:
TissueCell Wall
ParenchymaThin cellulose walls
CollenchymaIrregularly thickened at corners
SclerenchymaThick lignified walls, no internal space
(Page 62–63)
16Differentiate between striated, unstriated, and cardiac muscles on the basis of their structure and location.
Answer & Reference:
FeatureStriatedUnstriatedCardiac
StructureLong, cylindrical, multinucleateSpindle-shaped, uninucleateBranched, uninucleate
LocationAttached to bonesAlimentary canal, blood vesselsHeart
ControlVoluntaryInvoluntaryInvoluntary
(Page 68, Fig. 6.11)
17Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells.
Answer & Reference:
FeatureProkaryotic CellEukaryotic Cell
SizeGenerally small (1–10 µm)Generally large (5–100 µm)
Nuclear regionNucleoid (no nuclear membrane)Well defined, surrounded by nuclear membrane
ChromosomeSingle chromosomeMore than one chromosome
Membrane-bound organellesAbsentPresent
(Page 54–55)
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