The organism that causes 'black rust' of wheat is a: MCQ with Answer and Explanation

Explanation:
The lymphatic system drains excess tissue fluid (lymph) back to the venous blood. Blood circulation is the cardiovascular system; lymph nodes filter lymph; thymus is a primary lymphoid organ.

Explanation:
Ringworm (dermatophytosis) is a superficial fungal infection of the skin, hair, or nails. It is caused by dermatophyte fungi, primarily from the genera Microsporum, Trichophyton, and Epidermophyton. Despite the name, it is not caused by a worm. Aspergillus can cause aspergillosis, and Saccharomyces is yeast used in baking and brewing.

Explanation:
The Haversian system (osteon) is the characteristic structural unit of compact (cortical) bone in mammals. It consists of a central Haversian canal (containing blood vessels and nerves) surrounded by concentric layers of calcified matrix called lamellae. Between the lamellae are small spaces called lacunae, which house osteocytes (bone cells). Canaliculi connect the lacunae. Bird bones are pneumatic (hollow), and cartilage lacks Haversian systems.