Answer: Option D. -> Simple columnar epithelium
:
D
The entire luminal surface of the small intestine has villi, small projections ofmucosa. Thevilliare lined with simple columnar epithelial cells, also called enterocytes. The cells are tall with middle to basal nuclei and have an apicalbrush border, also known asmicrovilli.
Ciliated columnarepithelium moves mucus and other substances viaciliaand is found in the upper respiratory tract, the Fallopian tubes, the uterus, and the central part of the spinal cord

Answer: Option B. -> Cardiac muscles
:
B
To facilitate energy and calcium conductance in cardiac muscle cells, unique junctions called intercalated discs (gap junctions) link the cells together and define their borders.
A neuromuscular junction is a synapse between a motor neuron and skeletal muscle.
The junction between two neurons is also known as a synapse. Synapses can occurbetween two connected neurons or between a neuron and its target cells such as a muscle or gland cell.

Answer: Option D. -> Dense Connective tissue
:
D
The connective tissue with compact matrix and fibres are found in innermost parts like dermis of skin, ligaments and tendons is called as dense connective tissue. It is helpful in facilitating movement, in joints and rigidity and alsoprovideelasticity to skin.

Answer: Option B. -> 1. ⇛ Spiracles, 2. ⇛ Atrium, 3. ⇛ Trachea, 4. ⇛ Tracheoles, 5. ⇛ Organs.
:
B
In cockroach the passage of air flow is as follows : It enters the system by openings called Spiracles, then moves onwards into a small chamber called atrium where its pressure is regulated, from where it enters into the trachea , made of the protein trachein, and then into tracheoles (branches) and finally reaches the organs for exchange of gases, through diffusion. It returns through almost the same way, but exits out through the thoracic spiracles mainly as they are continuously open. Therefore, the correct option is
B.(1. $\Rrightarrow$ Spiracles, 2. $\Rrightarrow$ Atrium, 3. $\Rrightarrow$ Trachea, 4. $\Rrightarrow$ Tracheoles, 5. $\Rrightarrow$ Organs.)

Answer: Option D. -> All of the above
:
D
Neuroglial cells—usually referred to simply asglial cellsor glia—are quite different from nerve cells. The major distinction is that glia do not participate directly in synaptic interactions and electrical signaling.However, it is now known that glia play an active role in many central homeostatic processes and also during development. Four main types of glia exist, namely astrocytes, oligodendrocytes, ependymal cells and microglia.

Answer: Option A. -> 7th
:
A
In females, the 7th sternum is boat shaped and together with the 8th and 9th sterna forms a brood or genital pouch whose anterior part contains female gonopore, spermathecal pores and collateral glands

Answer: Option D. -> All of the above
:
D
A group of tissues that perform a specific function or group of functions is an organ and an organ is apart of an organism which is typically self-contained and has a specific vital function.Examples ofanimal organsareheart, lungs,brain, eye,stomach,spleen, bones,pancreas, kidneys,liver, intestines, skin,urinary bladderand sex organs.

Answer: Option B. -> Cartilage
:
B
Cartilageis an important structural component of the body. It is a firm tissue but is softer and much more flexible than bone.Cartilageis a connective tissue found in many areas of the body.Cartilage helps in bone to bone ligation.
Ligamentsare bands of fibrous tissue that connect bones to bones at joints
A tendon is a flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.