BIOLOGY 1 Marks Question

Origin Ectoderm, endoderm and mesoderm Function Protection, secretion and absorption.

Secretion and absorption.

Facilitating diffusion.

1. Periplaneta americana.
2.  

Tendons	Ligament
These are the dense regular connective tissues, which attach the muscles to bones.	These are the dense regular connective tissues which attach the bones at the joints.

3. Ciliated epithelium.

Prostomium is a lobe like structure and it acts as a covering of the mouth. Further the prostomium is used as a wedge while burrowing the soil.

1. It is a ring of hepatic caecae.
2. They secrete the digestive juice.

1. Lung alveoli are lined by simple squamous epithelium.
2. Since cells are flat, they form diffusion boundaries for easy exchange of respiratory gases.

Ligaments are formed of yellow elastic connective tissues. The ligaments join the two adjacent bones.

More than half.

Young cartilage cells: Chondroblasts. Mature cartilage cells: Chondrocytes.

Peristomium.

Adipose tissue.

Secretion, absorption, movement of particles or mucus.

Secretion and absorption.

1. Neuron.
2. Cartilage.

During midnight as they are nocturnal animals.

Setae in earthworm is S-shaped.

In the tracheoles.

In metameric segmentation, the external segmentation corresponds to the internal segmentation of the body.

Thirteen times to play.

They engulf microbes and dead cells therefore, they are called phagocytic cells.

Three, i.e., two auricles and one ventricle.

The first segment of earthworm is called a peristomium and it contains the buccal cavity of the earthworm.

Supra-oesophageal ganglion in the head.

Because the respiratory pigment is absent in their blood.

There is a pair of male genital pore in 18 segment of the earthworm.

The epithelial tissue faces either the body fluid or the outside environment and acts like covering for protection for certain parts of body.

Thyroid gland.

1. Foregut.
2. Crop.

Six segments.

1. Eight.
2. In the sixth abdominal segment.

The earthworms make burrows in the soil of playground. This spoils the ground.

Since development involves nymphal stages, it is called paurometabolous.

Setae help in locomotion of earthworm. (Correct statement)

Pheretima posthuma.

Haemocoel, heart and blood.

Since mosaic vision more often occurs during night, it is called nocturnal vision.

Cuboidal and columnar epithelia.

1. 13 chambers.
2. Ostia.

1. Simple squamous epithelium.
2. Simple columnar epithelium.

It has secretory function.

Smooth muscle fibers taper at both the ends (fusiform) and do not show striations. They are also called involuntary muscles. Muscle Striated skeletal muscle, Non-striated smooth muscles.

Neurons and neurogial cells.

Since the functioning of smooth muscles cannot be directly controlled by our will, they are called involuntary muscles.

Bones, cartilage and blood are the special types of connective tissues.

Spermatophores are the bundles of sperms glued together.

An organ is composed of similar or dissimilar type of tissues and is responsible for a specialised function.

Connective tissues are made of a matrix with cells of different types embedded in it. This works to connect other tissues.

Dorsal- Tergites Ventral- Sternites

The matrix of the bone is tough and contains a protein called ossein which makes it hard. It has mineral deposits of calcium and phosphates.