Biology MCQs

Notes:
Heart disease and High blood pressure are examples of Multifactorial Genetic Inheritance. It is also known as polygenic inheritance.

Notes:
Haemoglobin is called as tetrameric hemoprotein, while myoglobin is called monomeric protein. Haemoglobin is found systematically all over the body, while myo-globin is found in muscles tissues only. The body requires iron for the synthesis of its oxygen transport proteins, in particular hemo-globin and myoglobin.

Notes:
Cuscuta (Dodder) is a genus of about 100-170 species of yellow, orange or red (rarely green) parasitic plants. Dodders are supremely adapted for a life of plunder and pillage. Reduced in form to scrambling and twining threads, they appear to be completely leafless, although closer inspection reveals tiny scale leaves pressed close to the stems. So, it is a stem parasite.

Notes:
Silk worms are the larva of a moth (Bombyx mori) native to Asia that spins a cocoon of fine, strong, lustrous fiber that is the source of commercial silk. Silkworms feed on the leaves of the mulberries (genus- Morus) and sometimes on the Osage orange (Maclura pomifera).

Notes:
Riboflavin is also known as vitamin B2. It is a vitamin found in food and used as a dietary supplement. Food sources include eggs, green vegetables, milk and other dairy product, meat, fish, mushrooms, and almonds. Riboflavin is a water soluble and heat-stable vitamin that the body uses to metabolize fats, protein, and carbohydrates into glucose for energy.

Notes:
Turmeric, (Curcuma longa) is a perennial herbaceous plant of the ginger family (Zingiberaceae) that is tuberous rhizomeor underground stem. The turmeric plant is identifiable by both its characteristic tuberous root and the leaves that extend upward from erect, thick stems arising from the root. Turmeric root is actually a fleshy oblong tuber that is tapered at each end.

Notes:
Pulses are example of dicots since they have two cotyledons (dicot is short for ‘dicotyledon’, and ‘di’ means two). They contain two seeds inside the seed coat. Legumes (a family of plants that includes pluses, beans, peas and lentils) are all examples of dicot seeds.

Notes:
Pneumatic bone is hollow bone filled with air, connected to the respiratory system. Many of a bird’s bones are pneumatic as an adaptation to flying. For flight to occur in Aves, four physical forces (thrust and drag, lift and weight) must work together. In order for birds to balance these forces, certain physical characteristics are required. Which most of the flying birds have acquired in one way or other.

Notes:
The veins are the vascular tissue of the leaf and are located in the spongy layer of the mesophyll. The veins are made up of: Xylem: tubes that bring water and minerals from the roots into the leaf; and Phloem: tubes that usually move sap, with dissolved sucrose, produced by photosynthesis in the leaf, out of the leaf. Veins lend support to the leaf tissue, helping it keep its shape.

Notes:
Proper storage of seed is vital to conserving its vigour and vitality. Seeds can last from a few years to centuries, depending on the species and the storage conditions. In general, most seeds stored in cool, dry conditions will survive longer than seeds stored in a wet, warm environment.