Question 3 :
Assertion: Each testis is attached to the abdominal wall by a ligament and under testosterone influence it is drawn into the scrotum during development. Reason: Leydig or interstitial cells secrete androgens most potent being testosterone.

Question 4 :
Leydig cells in adult mammals produce which one of the following hormones?

Question 9 :
Development of animal embryo from egg without fertilization is called as<br/>

Question 11 :
Match list -I with list II and select the correct answer from the code given below this lists.<br><table class="wysiwyg-table"><tbody><tr><td></td><td><b>List I</b></td><td></td><td><b>List II</b></td></tr><tr><td>A</td><td>Neoteny</td><td>I</td><td>Axolotl larva</td></tr><tr><td>B</td><td>Parthenogenesis</td><td>II</td><td>Dragon fly</td></tr><tr><td>C</td><td>Retrogressive metamorphosis</td><td>III</td><td>Honey bee</td></tr><tr><td>D</td><td>Incomplete metamorphosis</td><td>IV</td><td>Ascidian larva</td></tr></tbody></table>

Question 16 :
The major role of flower in the life of plant is to?

Question 17 :
One of the following is the typical floral formula of Brassicaceae (Cruciferae).

Question 18 :
A bicarpellary, unilocular ovary with a single ovule at the base is found in

Question 23 :
The population in India is characterised by ________ birth rate and ________ death rate.

Question 24 :
A saponin called Yamogenin from Yam plant, <i>Dioscorea</i> is used as&#160;

Question 27 :
Which of the following types of organisms occupies more than one trophic level in a pond ecosystem?

Question 28 :
Assertion: With increase in population size, environmental resistance tends to increase.<br/> Reason: This is a nature's way to check the expression of biotic potential.

Question 32 :
Assertion: Cherrapunji in Khasi hills has the heaviest rainfall along with Teral region of Himalayas. Reason: South-east monsoon strikes the Himalayas at right angles and the vapour laden monsoon air gets condensed and causes heavy rainfall.