Q. Which of the following is/are the reasons for the syneresis in jellies
- Excess of acid
- Low pectin content
- Low sugar
- All of the above
Answer: d)
Synersis or weeping of jelly: The phenomenon of spontaneous exudation of fluid from a gel is called synersis or weeping of jelly. It is caused by following factors:
i) Excess of acid: Addition of excess of acid results in the breakdown of jelly structure due to the hydrolysis or decomposition of pectin.
ii) Too low concentration of sugar or soluble solids: This causes the network of pectin to hold more liquid than it possibly can do under normal conditions.
iii) Insufficient pectin: This results in the formation of a pectin network which is not sufficiently dense and rigid enough to hold the sugar syrup.
iv) Premature gelation: Gelation is caused due to breakdown of pectin during pouring of jelly into the containers. The jelly becomes weak and remains broken.
v) Fermented jellies: Fermentation usually takes place in those jellies in which synersis has taken place.
Q. Yellow orange colour in saffron is due to
- Xanthophyll
- Chlorophyll
- Crocetin
- None of the above
Answer: c)
Saffron has long been the world’s costliest spice by weight. Saffron’s taste and iodoform-like or hay-like fragrance result from the phytochemicals picrocrocin and safranal. It also contains a carotenoid pigment, crocin, which imparts a rich golden-yellow hue to dishes and textiles.
Q. Ethylene increases the rate of ……………………fruits
- transpiration
- respiration
- reproduction
- excretion
Answer: b)
Ethylene increases the rate of respiration and helps in ripening.
Q. Pineapple is a good source of
- Amylase
- Bromelin
- Palmolive
- None of the above
Answer: b)
Bromelain is a group of enzymes found in the fruit and stem of the pineapple plant. Pineapple is native to the Americas but is now grown throughout the world in tropical and subtropical regions. Historically, natives of Central and South America used pineapple for a variety of ailments, such as digestive disorders.
Q. Papain is obtained from
- Papaya
- Pineapple
- Pomegranate
- Pear
Answer: a)
Papain is taken from the fruit of the papaya tree. It is used to make medicine. Papain is sometimes used for sore throat.
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