Bio journal

Question 1

Few drops of iodine are added to food sample A. It turne blue-black.
i) State the aim of the experiment
ii) What do you conclude from the observation?

Answer 1

i) To test the presence of starch.
ii) The given sample A contains starch.

Question 2

What is the observation when:
i) Fehlings solution A is added to a test tube containing glucose
ii) Fehlings solution B is added to the above mixture
ii) It is heated

Answer 2

i) Light blue solution
ii) Deep blue solution
iii) Reddish-Brown ppt

Question 3

Nitric acid is added to a food sample. It gives a milky white ppt. What does this indicate?

Answer 3

Presence of Proteins

Question 4

How can you confirm if Fat is present in groundnut?

Answer 4

Rub it against paper. It turns translucent at the greasy spots.

Question 5

Long Bone

Answer 5

Femur, Humus

Question 6

Short bones

Answer 6

Carpals, Tarsals

Question 7

Flat Bone

Answer 7

sternum, scapula

Question 8

Irregular bone

Answer 8

Vertebrae, facial bone

Question 9

Aim of the experiment is state below. State its:
1. Requirements
2. Observations
3. Conclusion

Aim To demonstrate the Transpiration phenomena with the bell jar method.

Answer 9

1. Bell jar, well watered potted plant, rubber sheath, glass plate, vaseline
2. Water drops appear on inner walls of bell jar containing potted plant.
3. As the pot was covered with a rubber sheet it can be concluded that the droplets occurred due to Transpiration from aerial parts of the plant and not due to evaporation of water from the soil.