Crocodile and Penguin are similar to Whale and Dogfish in which one of the following features?
| 1. | Lay eggs and guard them till they hatch |
| 2. | Possess bony skeleton |
| 3. | Have gill slits at some stage |
| 4. | Possess a solid single-stranded central nervous system |
Select the correct combination of the statements (a-d) regarding the characteristics of certain organisms:
| (a) | Methanogens are archaebacteria that produce methane in marshy areas |
| (b) | Nostoc is a filamentous blue-green alga that fixes atmospheric nitrogen |
| (c) | Chemosynthetic autotrophic bacteria synthesize cellulose from glucose |
| (d) | Mycoplasma lack a cell wall and can survive without oxygen |
The correct statements are:
| 1. | (a), (b) and (c) | 2. | (b), (c) and (d) |
| 3. | (a), (b) and (d) | 4. | (b) and (c) |
Identify the components labelled A, B, C and D in the diagram below from the list (i) to (viii) given along with:
Components :
(i) Cristae of mitochondria
(ii) Inner membrane of mitochondria
(iii) Cytoplasm
(iv) Smooth endoplasmic reticulum
(v) Rough endoplasmic reticulum
(vi) Mitochondrial matrix
(vii) Cell vacuole
(viii) Nucleus
The correct components are:
| A | B | C | D | |
| 1. | (i) | (iv) | (viii) | (vi) |
| 2. | (vi) | (v) | (iv) | (vii) |
| 3. | (v) | (i) | (iii) | (ii) |
| 4. | (v) | (iv) | (viii) | (iii) |
Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?
| 1. | Enzymes are denatured at high temperatures but in certain exceptional organisms they are effective even at temperatures 80º - 90ºC |
| 2. | Enzymes are highly specific |
| 3. | Most enzymes are proteins but some are lipids |
| 4. | Enzymes require optimum pH for maximal activity |
Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character:
| 1. | The parents could not have had a normal daughter for this character |
| 2. | The trait under study could not be colourblindness |
| 3. | The male parent is homozygous dominant |
| 4. | The female parent is heterozygous |
The most apparent changes during the evolutionary history of Homo sapiens is traced in:
1. Walking upright
2. Shortening of the jaws
3. Remarkable increase in brain size
4. Loss of body hair
Given below are four statements (A-D) each with one or two blanks. Select the option which correctly fills up the blanks in two statements
Statements:
| (A) | Wings of butterflies and birds look alike and are the results of , evolution |
| (B) | Miller showed that CH4, H2, NH3, and , when exposed to electric discharge in a flask resulted in the formation of . |
| (C) | Vermiform appendix is a organ and an evidence pf evolution. |
| (D) | According to Darwin evolution took place due to and of the fittest. |
Options:
| 1. | (A) - (i) convergent, (B) - (ii) oxygen, (ii) nucleosides |
| 2. | (B) - (i) water vapour, (ii) amino acids, (C) - (i) rudimentary (ii) anatomical |
| 3. | (C) - (i) vestigial, (ii) anatomical, (D) - (i) mutations, (ii) multiplication |
| 4. | (D) - (i) small variations, (ii) survival, (A) - (i) convergent |
Fastest distribution of some injectible material / medicine and with no risk of any kind can be achieved by injecting it into the:
1. arteries
2. veins
3. lymph vessels
4. muscles
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Select the answer with correct matching of the structure, its location and function:
| A | B | C | |
| 1. | Cerebellum | Mid brain | Controls respiration and gastric secretions |
| 2. | Hypothalamus | Fore brain | Controls body temperature, urge for eating and drinking |
| 3. | Blind spot | Near the place where optic nerve leaves the eye | Rods and cones are present but inactive here |
| 4. | Eustachian tube |
Anterior part of internal ear | Equalizes air pressure on either sides of tympanic membrane |
ABO blood grouping is controlled by gene I which has three alleles and shows co-dominance. There are six genotypes. How many phenotypes in all are possible?
| 1. | three | 2. | four |
| 3. | five | 4. | six |
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