Biology 1 Marks Question

In both sexes, the abdomen of a cockroach consists of ten segments.

	Simple glands		Compound glands
1.	They contain isolated glandular cells.	1.	They contain a cluster of secretory cells.
2.	They are unicellular.	2.	They are multicellular.
3.	Examples include goblet cells of the alimentary canal.	3.	Examples include salivary glands.

Areolar tissue, blood, and tendons are examples of connective tissues. Neuron is an example of neural tissue.

Malphigian tubules: Malphigian tubules are excretory organs in cockroaches.

Exocrine, endocrine, and salivary glands are examples of simple glandular epithelium. Ligament is a connective tissue.

	Adipose tissue		Blood tissue
1.	It is composed of collagen fibres, elastin fibres, fibroblasts, macrophages, and adipociytes.	1.	In dense irregular connective tissues, fibres are arranged irregularly.
2.	It helps in the synthesis, storage, and metabolism of fats.	2.	It helps in the transportation of food, wastes, gases, and hormones.
3.	Is is present beneath the skin.	3.	It is present in the blood vessels.

The common name of Periplaneta Americana is the American cockroach.

Nephridia are segmentally arranged excretory organs present in earthworms.

Maxilla, mandible, and labrum are mouthparts of a cockroach. Antennae, on the other hand, are present in the head region of cockroaches.

Body wall in earthworms: In earthworms, the body wall consists of muscle layers. It helps in movement and burrowing.

RBCs, WBCs, and platelets are the three most important components of blood. Cartilage is therefore, the odd one out.

Malphigian tubules are main excretory organs of cockroaches. They form a part of the alimentary canal.

Protonema forms the developmental stage in the life cycle of a moss. Mesothorax, metathorax, and coxa are parts or segments present in the legs of a cockroach.

Four pairs of spermathecae are present in earthworms. They are located between sixth and the ninth segments. They help in receiving and storing the spermatozoa during copulation.

Ureters in frogs: A ureter acts as a urinogenital duct, which carries sperms along with urine in male frogs.

1. Osteocytes.
2. Chondrocytes.

Inner side of the first finger.

Hypopharynx acts as a tongue in cockroach and lies within cavity enclosed by the mouthparts.

The skin in frog is richly supplied with blood and provides extensive surface for respiration.

Tracheoles.

Cranial nerves-10 pairs Spinal nerves-9 pairs.

Open Circulatory System.

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.

Cardiac muscle has intercalated discs. They allow the cardiac muscle cells to contract as a unit, i.e. when one cell receives the stimulus to contract, all the neighbouring cells are also stimulated to contract.

Stratum spongiosum of dermis.

1. It is present beneath the skin.
2. It serves as a support framework for epithelia.
3. Macrophages, mast cells, fibroblasts.

Yellow elastic fibres and white collagen fibres.

Non-keratinised stratified squamous epithelium.

1. Skin.
2. Bone marrow.

S. No.	Column A	Column B
1.	Secretion and absorption	Columnar epithelium
2.	Protective covering	Stratified epithelium
3.	Linking and supporting framework	Connective tissue

The body segment of earthworm are called metameres.

Biceps.

A tadpole develops into a frog by the process of metamorphosis.

Upper lip-Labrum 10. Lower lip-Labium.

1. Neurons are excitable cells.
2. Neuroglial cells.

Closed Circulatory System.

Ootheca is produced by clitellum. Mature sperms, eggs and nutritive fluid are deposited in it.

In the 6th abdominal segment.

Intercerebral gland cells of the brain.

1. Ommatidia.
2. Phallomeres.

Oothecae are the capsules which enclose fertilised eggs.

Mesenteron.

1. Ileum.
2. Alary muscles.

1. Tegmina.
2. Anal cerci.

Phallic gland; it is in the 6th and 7th abdominal segments.

Muscular layer in the body wall of earthworm is made up of an outer layer of circular muscles and an inner layer of longitudinal muscles.

Collagen and elastin.

1. Simple squamous epithelium.
2. Stratified epithelium.

1. The body fluid is called haemolymph.
2. It consists of plasma and haemocytes.