A group of cells similar in form, function and origin is known as

Which of the following cells are living cells?

Aerenchyma is richly found in

Simple squamous epithelium is present in 

A neuron consists of

Muscles are joined to the bones by

One bone is joined with another bone by the tissue called

The growth of plants occurs only in certain regions because the dividing tissue called .............. tissue located only at that regions.

Chlorenchyma is a type of ............... which contains chlorophyll and performs photosynthesis.

A group of cells similar in structure and function is called as .................

Xylem and phloem are ............... plant tissues.

Animal epithelial tissue is classified as ..........., cuboidal, columnar, ciliated and ...............

Ligament and bone are example of ............... tissue.

What is a tissue?

What is the utility of tissues in multi-cellular organisms?

Explain how the bark of a tree is formed. How does it act as a protective tissue?  

Write major functions of stomata present in the epidermis.

List four elements of phloem. Which one of them is most important and why?

Give three features of cardiac muscles.

What are the functions of the stomata?

The skin, which protects the body, is made of
(i) epidermis squamous epithelial tissue. Since they are arranged in a pattern of layers, the epithelium is called stratified squamous epithelium.
(ii) dermis which lies below epidermis, made up of fibrous tissues and contains hair follicles, sebacious glands, sweat glands, nerve ending, etc.
(iii) the subcutaneous tissue is the deepest layer.
The sebacious glands secrete.a oily material called sebum which spread over the skin.The sweat glands secret sweat which is a dilute salt solution.Due to sebum and sweat dirt, viruses, bacteria, fungal spores, etc. get attached to the skin where they grow and may cause skin diseases.Find out about the common skin diseases and answer the following questions:
(i) Name some common skin diseases.
(ii) What should we do to prevent such skin diseases?
(iii) What is the key message conveyed by this information?

Sclerenchyma, a plant tissue, makes the plant hard and stiff.The cells of this tissue are dead. Their walls thickened due to deposition of lignin.They are long and narrow. You must have seen husk of a coconut fruit. It is used as coir fibre to make door mats, mattings (to cover floors), ropes, carpets, etc. They are tough, rough and strong yet they are degradable in nature.On the basis of above information answer the following questions:
(i) Name of two plants other than coconut from which we obtain sclerenchymatous fibres for commercial use.
(ii) In which garbage-non biodegradable or biodegradable, you will through husk of coconut after taking out coconut water from the coconut fruits?
(iii) What key messages these information conveys to us.

What is the difference between
(i) meristematic cells and permanent cells?
(ii) parenchyma and collenchyma?

Describe structure, location and function of squamous epithelium, cuboidal epithelium, columnar epithelium and striated squamous. 

Differentiate between bone and cartilage.

Give the differences between tendon and ligament.

What is the specific function of the cardiac muscle?