Science Do as directed; [1 M ]

Boutons are the swollen endings of the axon where synapsis with other neurons occur.

Goblet cell is a simple columnar epithelial cell which is modified to secrete mucus. It is seen in the intestine and other parts of the alimentary canal.

Lymphocytes are WBCs which are most abundant in lymph.

1. The common name of xylem is wood.
2. The common name of phloem is bast.

Lateral meristem is responsible for growth in grith of stem and root.

On the basis of arrangement of layers, epithelial tissue is classified into two types:

• Simple epithelium
• Stratified epithelium.

Skeletal or striated muscle gets fatigued very soon. These are voluntary muscels.

Tissue which is composed of two or more types of cells but contribute to a common function is called complex tissue.

Companion cell is living cell which is attached to the lateral side of sieve tube.

Stomata are tiny pores present on the leave’s surface which help in the exchange of gases and in transpiration.

The cells of bones are called osteocytes. Bone cells are embedded in a hard matrix that is composed of calcium and phosphorus compounds.

Ciliated epithelium is found in respiratory tract.

Cork is the example of protective tissue in the plants.

Blood platelets help in clooting of blood at the site of injury.

The striated muscle cells are long, cylindrical, unbranched and multinucleate.

Division of labour is adaptation of different parts of an organism to carry out different functions.

Squamous epithelium is also called pavement epithelium as it is made up of single thin layer of flattened cells.

Ligament connects two bones together at joints.

A tissue is a group of cells of the same type or mixed type having a common origin and performing a common function.

Lignin is deposited in the cell wall of sclerenchyma.

Each stomata is surrounded by a pair of guard cells. Guard cells regulate the opening and closing of stomata.

Connective tissues are most abundant and widely distributed in the body of complex animals.

Collenchyma is a simple permanent tissue which provides mechanical strength as well as flexibility to the plant organs.

Nerve impulse travel along the axons and dentrites. Nerve impulses enter a neuron along the dentrites and leave the neuron along the axon. Thus, the correct sequence through which nerve impulse is transmitted is: dendrites, cell body, axon, nerve endings.

The cells of phloem are called sieve tubes. Sieve tubes are conducting element of phloem which is responsible for transportation of food.

Meristematic tissue is present in plants but absent in animals.

A coverslip must always be places very gently while mounting in order to avoid the entry of air bubbles.

A permanent tissue is a group of cells which temporarily or permanently cease to divide have assumed a definite form and size.

1. Apical meristem: Shoot apes.
2. Lateral meristem: Cambium.

Synapse is the junction between the terminal part of one axon and the dendrite of the adjacent neuron. Synapses helps in the transmission of impulses from one neuron to another.

Collenchyma tissue is irregularly thickened at the corners due to the depositon of pectin and cellulose.

Three types of simple tissues of plants are:

• Parenchyma.
• Collenchymas.
• Selerenchyma.

Animals consume more energy as compared to plants as they move around in search of food, mates and shelter.

Bone cells are embedded in a hard matrix that is composed of calcium and phosphorus compounds.

Bone is a dense connective tissue in which matrix is solid.

RBC acts as a transportor of oxygen and carbon dioxide as it contains respiratory pigment called haemoglobin.

Stomata are tiny pores present on the leave’s surface which help in the exchange of gases and in transpiration.

Commercial cork is obtained from the cork oak tree.

Active movement of animals and sedentary habit of plants contribute more to difference in organ system of plants and animals.

The muscle of heart is known as cardiac muscle.

Collenchyma is the simple tissue that provides flexibility to soft aerial plant parts to withstand against winds.

Collenchyma tissue provides flexibility to plants so that they can easily bend without breaking. It also provides mechanical support to plants.

Columnar epilthelium has pillar-like cells.

Blood is fluid connective tissue which has fibreless matrix.

Simple tissue is made up of only one type of cells that carry out the same function.

WBC protects our body against infections.

Blood platelets occur in human blood. They are minute, colourless, biconvex and non-nucleated blood corpuscles. They help in clotting of blood at the site of injury.

Tracheid is a conducting element of xylem.

Tissues with dead cells are more common in plants.

There are two types of plant tissues- Meristematic and permanent.