Tissues -1

Tissues
Questions (pg 69)
1. What is a tissue?
Tissues are a group of cells that are similar in structure and or work together to achieve a particular function.

2. What is the utility of tissues in multicellular organisms?
Tissues provide protection, mechanical strength and give highest possible efficiency of function to the organisms.
Questions (pg 74)
1. Name types of simple tissues.
The types of simple tissues are:
(i) Parenchyma
(ii) Collenchyma
(iii) Sclerenchyma

2. Where is apical meristem found?
Apical meristem is found at the growing tips of root and stem in the plants.

3. Which tissue makes up the husk of coconut?
The sclerenchyma tissue makes up the husk of coconut.

4. What are the constituents of phloem?
The constituents of phloem are:
(i) Sieve tubes: They are tubular cells having perforated walls.
(ii) Companion cells: They transport food from the leaf to other parts of the plant body.
(iii) Phloem fibers: They are the only dead cells in phloem.
(iv) Phloem parenchyma

Questions (pg 78)
1. Name the tissue responsible for the movement of our body.
The muscular tissue is responsible for the movement of our body.

2. What does a neuron look like?
A neuron looks like a long thread like structure.

3. Give three features of cardiac muscles.
Three features of cardiac muscles are:
(i) They are involuntary in action.
(ii) They occur only in the heart.
(iii) They have intercalated discs and do not feel fatigue.

4. What are the functions of areolar tissue?
The functions of areolar tissue are:
(i) They act as a supporting and packaging tissue.
(ii) It helps in repair of tissues after injury.
(iii) It fixes skin to underlying muscles.
(iv) It helps in combating foreign toxins.