Question 2 :
Peculiar primitive animals found in Madagascar but absent in Africa are<br>

Question 3 :
Species which are restricted to a particular geographical region are called-

Question 10 :
Which of the following factors affect the natural habitatof endemic species?

Question 11 :
Organisms that cannot be seen by naked eyes is called as

Question 15 :
W<span class="wysiwyg-font-size-medium">hich of the following are commonly used as food preservatives?

Question 16 :
Mark the correct statement:<br/>a) Pasteurized milk can be consumed without boiling as it is free from harmful microbes<br/>b) The milk is heated to about $700^{\circ}C$ for $15$ to $30$ seconds and then suddenly chilled and stored<br/>c) Pasteurization prevents the growth of microbes

Question 18 :
Assertion: Don't store food in an opened tin can, or re-use empty cans to cook or store food. Reason: When the food is open to the air, the tin from the can might transfer more quickly to the can's contents.

Question 20 :
Heating milk at 65$^o$C followed by sudden cooling is known as

Question 22 :
Of the following all are the traditional method of irrigation except

Question 23 :
Azolla pinata has been found to be an important biofertiliser for paddy crops. This quality is due to the presence of :

Question 24 :
In which of the following processes is chaff removed from grains ?

Question 26 :
Crops which are grown in the winter season are called as&#160;

Question 30 :
Which of the following irrigation procedure is/are followed when the land of cultivation is huge and the availability of water is scarce?

Question 31 :
Which of the following is used maximum for lifting water from wells?

Question 36 :
The disadvantage of hoe to humans as presented by some individuals is____________

Question 39 :
Match column I with column II and select the correct option from the codes given below.<table class="wysiwyg-table"><tbody><tr><td>Column I</td><td>Column II</td></tr><tr><td>(a) <i>Rhizobium</i></td><td>(i) Nitrogen fixation</td></tr><tr><td>(b) Organic manure<br/></td><td>(ii) Separation of grains from chaff</td></tr><tr><td>(c) Threshing</td><td>(iii) Sowing of seeds</td></tr><tr><td>(d) Seed drill</td><td>(iv) Animal excreta, cow dung and plant wastes</td></tr><tr><td>(e) Leguminous plants</td><td>(v) Root nodules</td></tr></tbody></table>

Question 44 :
The chlorophyll in photosynthetic prokaryotic bacteria is associated with membranous vesicles but not with plastids.

Question 45 :
Which of the following combinations are present in plant cell but not in animal cell?

Question 47 :
Which cellular organelle would be&#160;concentrated at the top of the centrifuged mixture after centrifugation of cells containing solution?

Question 49 :
Assertion: Prokaryotic cells have no membrane bound organelles. Reason: The cytoplasm of prokaryotic cells does not show streaming movement.

Question 50 :
All performed an experiment in which they put two different cells P and Q in pure water. Cell P swelled up and burst eventually while cell Q became tight and firm but did not burst.<br/>Which of the following is the most appropriate inference?

Question 53 :
Double fertilisation is characteristics of which of the following plant category?

Question 54 :
Which of the following patterns of reproduction involves the&#160;exchange of genetic material?

Question 56 :
Reproduction of immature or larval stage of animals caused by the acceleration of maturation is called as

Question 58 :
Which gland plays a key role in metamorphosis of a frog?<br/>

Question 61 :
Assertion: Cross pollinated flowers are usually unisexual, where the flowers are bisexual, there are seven checks which help in cross-pollination and discourage self-pollination. Reason: Cleistogamy promote cross-pollination.

Question 63 :
Assertion: Self-pollination helps in purity of races, wastage of pollen is avoided and pollination is sure. Reason: Cleistogamy favours self-pollination.

Question 64 :
Triple fusion was discovered in this plant possessing naked bulb, fleshy leaf bases and loculicidal capsule

Question 65 :
Which of the following is correct among the differences in between pollination and fertilization?<br>

Question 66 :
In an experiment, sperms removed from epididymis of a man were added in a dish containing appropriate media and oocyte. No fertilisation was seen. However, when sperms from epididymis were directly placed in uterus of an ovulated woman, she became pregnant. These observations suggest that

Question 69 :
Development of animal embryo from egg without fertilization is called as<br/>

Question 70 :
The mechanism of fertilization involves different events like approximation of gametes, acrosomal reaction activation of egg and amphimixis. &#160;According to F.R. Lillie approximation occurs due to interacting complementary substances called fertilizin and anti fertilizin.<br/>Fertilizin is <br/>