Question:Consider the following statements.
1. Vascular tissue of the complex plants has made possible their survival in the terrestrial environment.
2. Phloem consists of tracheids, vessels, companion cells and phloem fibers.
Which of the above statements is/are FALSE?
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 Nor 2
Phloem is made up of four types of elements: sieve tubes, companion cells, phloem fibres and the phloem parenchyma. Xylem consists of tracheids, vessels, xylem parenchyma.
Question:Calcium level decreases in the blood due to hyposecretion of -View
(a) Parathyroid Hormone
(d) ACTH hormone
Parathormone is secreted from parathyroid gland. This hormone helps to regulate the metabolism of calcium and certain other minerals like phosphate. Combined effect of parathormone and calcitonin normally maintain the blood calcium level.
Most commercially available antacids are combinations of aluminum and magnesium hydroxide. Some effervescent antacids contain sodium bicarbonate, that old household remedy for tummy aches known as “baking soda.”
Question:Why do we get muscle cramps after heavy exercise?.
(a) Shortening of myofibrils
(b) Reduction in myosin
(c) Lengthening of myofibrils
(d) Muscle Cells respire anaerobically
The cramps occur when muscle cells respire anaerobically. The partial breakdown of glucose produces lactic acid. The accumulation of lactic acid causes muscle cramps. We get relief from cramps after a hot water bath or a massage. Hot water bath or massage improves circulation of blood. As a result, the supply of oxygen to the muscle cells increases. The increase in the supply of oxygen results in the complete breakdown of lactic acid into carbon dioxide and water.
Question:Crooke’s glass that cuts harmful ultra violet rays that are harmful to eyes contains -View
• Tasar is copperish colour, coarse silk mainly used for furnishings and interiors. It is less lustrous than mulberry silk, but has its own feel and appeal. Tasar silk is generated by the silkworm, Antheraea mylitta which mainly thrive on the food plants Asan and Arjun.
Within the Sapota tree's bark is the white, gummy sap the tree is famous for, called chicle. The part of the chewing gum after the flavour is gone is called Chicle.
Question:Consider the following statements
1. Trans fats are a form of unsaturated fat.
2. Natural trans fats are found in some animal products and are not harmful.
3. Trans fats significantly increases HDL cholesterol.
Which of the above is/are true?.
(a) Only 2 & 3
(b) Only 1
(c) Only 1 and 2
(d) 1, 2 and 3
• Saturated fats are derived from animal products such as meat, dairy, and eggs. But they are also found in some plant-based sources such as coconut, palm and palm kernel oils. These fats are solid at room temperature. Saturated fats directly raise total and LDL (bad) cholesterol levels.
• Trans fats are actually unsaturated fats, but they can raise total and LDL (bad) cholesterol levels while also lowering HDL (good) cholesterol levels.
• Trans fats are used to extend the shelf life of processed foods, typically cookies, cakes, fries, and donuts. Any item that contains “hydrogenated oil” or “partially hydrogenated oil” likely contains trans fats. Hydrogenation is the chemical process that changes liquid oils into solid fats.
• Monounsaturated fats are liquid at room temperature but begin to solidify at cold temperatures. This type of fat is preferable to other types of fat and can be found in olives, olive oil, nuts, peanut oil, canola oil, and avocados. Some studies have shown that these kinds of fats can actually lower LDL (bad) cholesterol and maintain HDL (good) cholesterol.
• Polyunsaturated fats are also liquid at room temperature. These are found in safflower, sesame, corn, cottonseed and soybean oils. This type of fat has also been shown to reduce levels of LDL cholesterol, but too much can also lower your HDL cholesterol.
Question:Where is the "seat of consciousness" in human brain?. -View