Board exam

MnO₂ + x HCl → MnCl₂ + y H₂O + z Cl₂ In order to balance the above chemical equation, the values of x, y and z respectively are :

1. A6, 2, 2
2. B4, 1, 2
3. C4, 2, 1
4. D2, 2, 1

A metal ‘X’ is used in thermite process. When X is burnt in air it gives an amphoteric oxide ‘Y’. ‘X’ and ‘Y’ are respectively :

1. AFe and Fe₂O₃
2. BAl and Al₂O₃
3. CFe and Fe₃O₄
4. DAl and Al₃O₄

Select washing soda from the following :

1. ANaHCO₃
2. BNa₂CO₃.5H₂O
3. CNa₂CO₃.10H₂O
4. DNaOH

An organism which breaks down the food material outside the body and then absorbs it is

1. Aa plant parasite, Cuscuta
2. Ban animal parasite, Tapeworm
3. Ca bacteria, Rhizobium
4. Da fungi, Rhizopus

Consider the following statements about small intestine and select the one which is NOT correct :

1. AThe length of the small intestine in animals differs as it depends on the type of food they eat.
2. BThe small intestine is the site of complete digestion of food.
3. CThe small intestine receives secretions from liver and pancreas.
4. DThe villi of the small intestine absorb water from the unabsorbed food before it gets removed from the body via the anus.

The statement that correctly describes the characteristic(s) of a gene is :

1. AIn individuals of a given species, a specific gene is located on a particular chromosome.
2. BA gene is not the information source for making proteins in the cell.
3. CEach chromosome has only one gene located all along its length.
4. DAll the inherited traits in human beings are not controlled by genes.

Select from the following the correct statement about tropic movement in plants :

1. AIt is due to stimulus of touch and temperature.
2. BIt does not depend upon the direction of stimulus received.
3. CIt is observed only in roots and not in stems.
4. DIt is a growth related movement.

Select the INCORRECT match (between the plant and its vegetative part) from the following :

1. ABryophyllum, leaf
2. BPotato, stem
3. CMoney-plant, stem
4. DRose, root