Biology Test 282

China rose flowers are – Actinomorphic – Hypogynous – Twisted aestivation

Onion: Bulb, Imbricate aestivation, Axile placentation

• Bulb: Onions are known for their underground storage organ called a bulb. The bulb is a modified stem with fleshy leaves.
• Imbricate Aestivation: This term refers to the overlapping arrangement of sepals or petals in a floral bud. In onions, the outermost layer of the bulb's fleshy leaves exhibits imbricate aestivation.
• Axile Placentation: This term describes the arrangement of ovules within an ovary. In onions, the ovules are attached to the central axis (axile) inside the ovary.

Radial vascular bundles are present in roots. Monocot roots have polyarch and exarch condition of xylem.

Apical meristems are located at the tips of roots and shoots, where they play a crucial role in the vertical growth of plants by adding length to the plant body. This type of meristem is responsible for the primary growth of the plant, contributing to the elongation of the plant axis and the formation of new organs.

Option B : (B), (C) and (D) only

Lateral meristems are the meristems that add to the width or girth in a process known as secondary growth. They are responsible for the secondary growth in plants and are found parallel to the sides of the plants.

1. Axillary buds (A) are not lateral meristems; they are capable of forming branches or flowers.

2. Fascicular vascular cambium (B) is a type of lateral meristem. It contributes to secondary growth and produces secondary vascular tissues.

3. Interfascicular cambium (C) is also a type of lateral meristem. It also contributes to secondary growth in the stem.

4. Cork cambium (D), also called phellogen, is a lateral meristem and it produces the cork, a part of the protectiveouter layer (periderm) in stems and roots.

5. Intercalary meristem (E) is not a type of lateral meristem but rather a type of apical meristem located at the base of leaves or internodes on a plant stem, which is involved in primary growth and elongation of the plant.

Therefore, the correct answer is option B : Fascicular vascular cambium (B), Interfascicular cambium (C) and Cork cambium (D) only.

As the ventricle is completely divided in birds, mammals and some reptiles (Crocodiles alligator) the left and right pans of the heart function as air tight conduits for pure and impure blood. The right part receives impure blood from whole body and sends it to the lungs for oxygenation. The left part receives purified blood from the lungs and supplies it to the whole body Thus the right and left parts of the heart respectively serve as completely separated pulmonary and systamic hearts. This is known as double heart circuit. In man the rate of heart beat (double circulation) is about 75 times per minute

Myocardial infarction, the medical term for heart attack, literally means "heart tissue damage or death." Heart attacks most commonly occur when one or more of the coronary arteries — a network of blood vessels that supply blood to the heart — become blocked. Heart muscle becomes starved for oxygen and nutrients.

Whereas cardiac arrest refers to the sudden, unexpected loss of heart function, breathing and consciousness.

In cardiac arrest, the heart abruptly stops beating. Without prompt intervention, it can result in the person's death.

Coronary heart disease (CHD) is a disease in which a waxy substance called plaque builds up inside the coronary arteries. These arteries supply oxygen-rich blood to your heart muscle. When plaque builds up in the arteries, the condition is called atherosclerosis. The buildup of plaque occurs over many years.

The blood circulation from heart to lungs and back to heart is pulmonary circulation and the circulation between heart to tissue and back to heart is systematic circulation and both are included in double circulation.

In the given figure depicting the human respiratory system, the unidentified parts are as follows: A-Epiglottis, B-Alveoli, C- Bronchus, D-Diaphragm.