11. Which of the following are longest cells of human body?
[A] Epethelial cells
[B] Pancreatic cells
[C] Nerve cells
[D] Epidermal cells
Show Answer
Correct Answer: C [Nerve cells]
Notes:
A neuron or nerve cell is a cell that carries electrical impulses. Neurons are the basic units of the nervous system. Every neuron is made of a cell body (also called a soma), dendrites and an axon. Dendrites and axons are nerve fibers. It is the longest cell of human body.
12. Which of the following is the result of the decrease in white blood cells?
[A] Decrease in Antibodies
[B] Increase in Antigens
[C] Increase in Antibodies
[D] No change
Show Answer
Correct Answer: A [Decrease in Antibodies]
Notes:
A low white blood cell count usually is followed by decrease in number of antibodies. When your white blood cell count is low you may not have the usual signs and symptoms when developing an infection such as Redness, Swelling, Pus formation, Cough, Sputum, Nasal drainage and decrease in antibodies.
13. Which of the following forms of Nitrogen is taken up by Higher Plants?
[A] Nitrites only
[B] Nitrates only
[C] Nitrates and ammonia
[D] Urea
Show Answer
Correct Answer: B [Nitrates only]
Notes:
Plants do not get their nitrogen directly from the air. Plants absorb nitrogen from the soil in the form of nitrate (NO3−) and ammonium (NH4+). Nitrate is the form of nitrogen most used by plants for growth and development. Nitrate is the form that can most easily be lost to groundwater.
Nitrogen is a component of chlorophyll and therefore essential for photosynthesis. It is also the basic element of plant and animal proteins, including the genetic material DNA and RNA, and is important in periods of rapid growth. Plants use nitrogen by absorbing either nitrate or ammonium ions through the roots.
14. Which of the following arteries supplies blood to the heart?
[A] Carotid arteries
[B] Hepatic arteries
[C] Coronary arteries
[D] Pulmonary arteries
Show Answer
Correct Answer: C [Coronary arteries]
Notes:
The aorta (the main blood supplier to the body) branches off into two main coronary blood vessels (also called arteries). These coronary arteries branch off into smaller arteries, which supply oxygen-rich blood to the entire heart muscle. The right coronary artery supplies blood to the right side of the heart.
15. With reference to the blood in a normal person, which one of the following statements is correct?
[A] Compared to arteries, veins are less numerous and hold less of the body’s blood at any given time
[B] Blood cells constitute about 70 per cent of the total volume of the blood
[C] White Blood Cells (WBC) are made by lymph nodes only
[D] The blood has more platelets than WBC
Show Answer
Correct Answer: D [The blood has more platelets than WBC]
Notes:
Blood has more platelets than corpuscles. A microlitre of blood contains 5,000-10,000 of White blood cells (WBC) and 150,000-500,000 platelets.
16. What does D stand for in the term HDL which is related with Lipoproteins ?
[A] Dopamine
[B] Density
[C] Distribution
[D] Dissolution
Show Answer
Correct Answer: B [Density]
Notes:
The High- Density Lipoprotein (HDL) is one of the five major groups of Lipoproteins. Lipoproteins are complex particles which are composed of multiple proteins that transport all fat molecules around the body within the water outside the cells.
17. The scientific study of organisms as affected by seasonal climates e.g. of bird migration, the opening of flowers, etc is called __?
[A] Phenology
[B] Phylogeny
[C] Phrenology
[D] Phycology
Show Answer
Correct Answer: A [Phenology]
Notes:
The scientific study of organisms as affected by seasonal climates e.g. of bird migration, the opening of flowers etc is called Phenology.
18. Phaeophyceae is commonly known as which of the following algae?
[A] Green Algae
[B] Brown Algae
[C] Red Algae
[D] Blue Algae
Show Answer
Correct Answer: B [Brown Algae]
Notes:
Brown algae, which include the class Phaeophyceae, are a large group of multicellular algae, which includes many seaweeds located in cold waters within the Northern Hemisphere. Brown algae are the major seaweeds of temperate and polar regions.
19. In what form do fungi store food?
[A] Lipid
[B] Starch
[C] Oil and glycogen
[D] Protein
Show Answer
Correct Answer: C [Oil and glycogen]
Notes:
Oil and glycogen are stored in the fungus. Glycogen is a type of food that animals and fungi store.
20. Which of the following can occur during genetic recombination during prokaryotes?
[A] Transformation
[B] Transduction
[C] Conjugation
[D] All of these
Show Answer
Correct Answer: D [All of these]
Notes:
Prokaryotes are organisms whose cells lack a nucleus and other organelles.
