Board exam

Which structure in a leaf is mainly responsible for gaseous exchange ?

1. AXylem
2. BStomata
3. CPhloem
4. DCuticle

Identify the correct statement for spirogyra, leishmania and hydra :

1. Athey reproduce sexually.
2. Bthey are unicellular.
3. Cthey are multicellular.
4. Dthey reproduce asexually.

Human brain has various parts or regions that help in different actions, responses and coordination. From the following, identify the part responsible for precision of voluntary actions :

1. ACerebrum
2. BCerebellum
3. CMedulla
4. DPons

Pancreas secretes pancreatic juice which contain certain enzyme that helps in digestion of food. Choose the correct option from the following :

1. ATrypsin digests emulsified fats and lipase digests proteins.
2. BTrypsin digests proteins and lipase digests emulsified fats.
3. CTrypsin and lipase both digests fats.
4. DTrypsin digests proteins and lipase digests carbohydrates.

Sex is determined by different factors in various species. However, in human beings, it is determined genetically. Which amongst the following option(s) is/are correct for human beings ?

1. (i)
   Gamete carrying X chromosome from female parent.
2. (ii)
   Gamete carrying X chromosome from male parent.
3. (iii)
   Gamete carrying Y chromosome from male parent. Options :

Which of the following group is not ‘biodegradable’ ?

1. AVegetable peels, dead leaves, paper
2. BCow dung, leather bag, water
3. CPolythene bag, rubber band, ball pen
4. DPaper, fruits, bones

Assertion (A) : Reflex actions do not involve thinking. Reason (R) : Most reflex actions are controlled by the spinal cord.

1. ABoth, Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. BBoth, Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. CAssertion (A) is true, but Reason (R) is false.
4. DAssertion (A) is false, but Reason (R) is true.

Assertion (A) : In human beings, the respiratory pigment is haemoglobin present in red blood cells. Reason (R) : Haemoglobin has a very high affinity for carbon dioxide.

1. ABoth, Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
2. BBoth, Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
3. CAssertion (A) is true, but Reason (R) is false.
4. DAssertion (A) is false, but Reason (R) is true.