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Biology

240)The most important stimulant in tea leaves is
phenylalanine theine
caffeine brucine
Answer :

241)The international Rice Research Institute is based in
Nigeria Phulippines
Australia Mexico
Answer :

242)Match the following
A. Testis tubule                      1. stratified cuboidal epithelium
B. Epidermis                          2. endothelium
C. Glomerulus                         3. simple squamous epithelium
D. pulmonary alveoli                  4. stratified squamous epithelium
A-1, B-3, C-4, D-2 A-1, B-4, C-2, D-3
A-2, B-3, C-1, D-4 A-3, B-4, C-2, D-1
Answer :

243)The tissue that plays a leading role in the elongation of many bones is
spongy bone fibroelastic tissue
areolar tissue cartilage
Answer :

244)The Red Sea derives its name from the
red bloob caused by a red alga red bloom caused by a blue-green alga
red coloured effluents deposited in it profuse growth of a red flowered plant
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245)Which country is called the sugar bowl of the world?
India Argentina
USA Cuba
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246)All living organisms are single celled in their earliest life history. Which of the following is such a cell?
sperm ovum
zygote spermatocyte
Answer :


247)A prokaryote is
a hard and stony fruit a single-celled organism
the most primitive multicelluar organism an organism lacking membrane bound nucleus in its cells
Answer :

248)Laboures who do hard manual work develop thick skin on their palms and soles which is due to
thick dermis thick epidermis
thick subcutaneous tssue None of these
Answer :

249)Leather is a derivative of
dermis only dermis and subcutaneous fatty tissue
both dermis and epidermis epidermis, dermis and subcutaneous tissue
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250)Half-cooked potatoes, if eaten with food, are not digested. This is because
starch granules in semi-cooked potatoes are coated with cellulose, which is in turn, is not digested starch in semi-cooked potatoes is in insoluble form and fails to form a complex with the concerned enzyme
insufficient heat does not convert cellulose into starch starch granules in semi-cooked potatoes are coated with lignin, which is in turn, is not digested
Answer :

251)Exposer to carbon monoxide (gas) is extremely dangerous and can kill a patient because
COHb reduces the ability of blood to transport oxygen by rupturing a vast majority of erythrocytes COHb greatly modifies the structure of the haemoglobin thus making it lose its affinity for oxygen
COHb is stable compound and thus stops blood's ability to transport oxygen the compound carboxy-haemoglobin (COHb), it forms with haemoglobin, can gradually clot the blood resulting in circulatory failure
Answer :

252)Heart murmur is due to a
leaky valve non functional atrium
small aorta coronary thobosis
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253)We lose consciousness if blood flow to the brain is cut off for more than
2 sec 5 sec
15 sec 2 min
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254)A particular cell organelle is sometimes refrred to as the "suicide bag" because it contains certain enzymes that can break down the cell components or the whole cell. Which one of the following is such an organelle?
mesosome phagosome
ribosome lysosome
Answer :

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