Question 2 :
Statement1: Rate of breathing is regulated by respiratory centres present in the medulla oblongata. <br/>Statement 2 : Changes in the $CO_{2}$ level of the arterial blood control the rate of breathing.

Question 4 :
Out of $38$ molecules of ATP produced upon aerobic respiration of glucose, the break up in ATP production in glycolysis(P), pyruvate to acetyl-CoA formation(Q) and Krebs cycle(R) is as follows

Question 5 :
<span>Which of the following types of animal are affected the most by t</span><span>emperature changes in the environment?</span><br/>

Question 8 :
Name of cells which help in clotting of blood in mammals ____________.

Question 10 :
<table class="wysiwyg-table"><tbody><tr><td>Monoecious, female, pedicel, sepals and petals, thalamus, torus, receptacle, male, unisexual, bisexual, dioecious.</td></tr></tbody></table>Use the above phrases to fill in the blanks.<br/><br/>Flower is a condensed shoot which is specialized to carry out sexual reproduction. It is borne over a stalk called ........ (1) ............. <br/>There is a broad base called .........(2) ............<br/>Thalamus bears four types of floral organs-sepals, petals,stamens and carpels. ................(3) ........................ have no direct function in sexual reproduction. <br/>They are called accessory or non-essential floral organs. <br/>Stamens and carpels are essential floral organs as they take part in sexual reproduction.<br/>&#160;Stamens are .........(4) ........... reproductive organs while carpels are ......... (5) .......... reproductive organs.<br/>Flowers are called ..........(6) ............. if they have either stamens (male or staminate) or carpels (female or pistillate), e.g., papaya, watermelon.<br/>&#160;They are known as ..........(7)..........if the flowers possess both stamens and carpels, e.g.,Mustard, Hibiscus. Plants with unisexual flowers are called .......... (8) .......... if both male and female flowers occur on the same individual (e.g., Maize, Watermelon). <br/>They are called ........... (9) ........ if male and female flowers are found on different individuals (e.g., Papaya).<br/>

Question 12 :
Motile, asexual and endogenous spores produced in algal members are called

Question 14 :
Which of the following is an example of the action of the autonomous nervous system?

Question 16 :
The difference between the two nucleic acids DNA and RNA can be characterized by the presence of .......... in the latter.

Question 17 :
Pith is a central part of the ground tissue generally made up&#160;of<br/>

Question 21 :
Which one of the following pairs of food components in&nbsp;humans reaches the intestine totally undigested?<br>

Question 24 :
Choose the correct answers from the alternatives given.<br>The&nbsp;major insect body parts are:

Question 25 :
Plants which show both calvin and Hatch slack pathways are :

Question 27 :
Which of the following microorganims can fix nitrogen in non-leguminous plants?

Question 28 :
For nitrogen fixation, which of the following is not a requirement of nitrogenase enzyme?

Question 29 :
The two conical half spindles, are found in which of the following phase?&#160;