PRACTICE PAPER FOR PT-II

Which statement can be concluded from the image?

• (a) plants absorbCO2 from air and H2 O from the soil as raw materials and convert them into glucose

• (b) plants absorbCO2 from the soil and H2 O from air as raw materials and convert them into glucose

• (c) plants absorbO2 from air and glucose from the soil as raw materials and convert them into light energy

• (d) plants absorbO2 from air and minerals from the soil as raw materials and convert them into heat energy

A student sets up an experiment to study the importance of nutrition in plants. The student takes 2 pots, pot 1 and pot 2 each with the same healthy plant. Both the pots were placed in the garden and watered properly. Pot 1 was kept as such, while pot 2 was kept in an air tight glass box with caustic soda. Caustic soda absorbs carbon dioxide present in the surrounding. After 2 days, the student observes that the plant kept in the garden is healthy while the plant placed in container shed leaves and droops. What is the likely reason for this observation?

• (a) lack of nutrients in the soil

• (b) absence of oxygen for surviva

• l (c) inability to perform photosynthesis

• (d) absorption of light by caustic soda restricting growth

Which of the equation show correct conversion of CO2 and H2 O into carbohydrates in plants?

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A student sets up an experiment to study the photosynthesis in plants. The student de starched a potted plant by keeping it in a dark room for 3 days. Half of the portion of de starched leaf was placed in a bottle containing caustic potash (absorbs CO2 ) as shown.

The student then places the plant in light and tests the leaf after 5 hours for the presence of starch. The portions inside the bottle shows negative starch test by reflecting no change in colour when react with iodine, however, other upper portions of the leaf gave positive starch test showing blue-black colour with iodine. What can be evaluated from this experiment?

• (a) carbon dioxide is directly linked with the colour of leaf

• (b) carbon dioxide is necessary for preparing carbohydrate

• (c) lack of carbon dioxide increases amount of starch in plant

• (d) lack of carbon dioxide slows the process of photosynthesis

How these fungi obtain nutrition?

• (a) by eating the bread on which it is growing

• (b) by using nutrients from the bread to prepare their own food

• (c) by breaking down the nutrients of bread and then absorbing them

• (d) by allowing other organisms to grow on the bread and then consuming them

How this process is advantageous for Amoeba?

• (a) capturing of food takes less time

• (b) complex food can be digested easily

• (c) more amount of food can be consumed

• (d) fast distribution of nutrition within the body

The image shows the human digestive system. Digestion of food starts from which organ of the digestive system?

• (a) mouth due to the presence of saliva s

• (b) oesophagus that moves the food in gut

• (c) that releases juices for fat breakdown

• (d) which helps in mixing food with digestive juice

What will be the likely happen if the number of villi increases in the intestine?

• (a) increase in the absorption of food

• (b) fast elimination of waste from the body

• (c) increase in flow of blood in the small intestine

• (d) fast breakdown of larger food particles into smaller ones

An incomplete equation for the digestion of starch using saliva is shown as:

Saliva + Starch (in test tube) →

What will be the likely outcome of this?

• (a) Saliva will convert starch into complex fat molecules.

• (b) Saliva will convert starch into complex sugar molecules.

• (c) Saliva will breakdown starch into simple sugar molecules.

• (d) Saliva will breakdown starch into simple protein molecules.

A student sets up an experiment to study the role of enzymes in digestion of food.

In which test tube, the digestion of protein will occur?

• (a) Test tube A as pepsin will breakdown into simple molecules.

• (b) Test tube B as HCl will breakdown protein into simple molecules.

• (c) Test tubes A as pepsin will breakdown protein into simple molecules.

• (d) Test tube B as HCl will activate pepsin for breakdown of protein into simple molecules.