Plant: Economic Importance (Plant Physiology)

Total Questions: 60

21. Which of the following plant is used for 'bio-diesel' - [Chhattisgarh P.C.S. (Pre) 2005]

Correct Answer: (d) Jatropha curcas
Solution:Jatropha Curcas, the plant is considered a future feedstock for biodiesel production because it is easily grown in a harsh environment and is a non-edible crop. It is an Angiospermic plant.

At the time of cultivation, it needs very less amount of water compared to other plants. The seeds of these plant are used as biodiesel. Biodiesel has become more attractive because of its environmental benefits and is obtained from renewable resources.

22. Which one of the following is a bio-diesel plant? [U.P. R.O/A.R.O. (Mains) 2021]

Correct Answer: (c) Jatropha
Solution:Jatropha Curcas, the plant is considered a future feedstock for biodiesel production because it is easily grown in a harsh environment and is a non-edible crop. It is an Angiospermic plant. At the time of cultivation, it needs very less amount of water compared to other plants.

The seeds of these plant are used as biodiesel. Biodiesel has become more attractive because of its environmental benefits and is obtained from renewable resources.

23. Which plant is known as bio-diesel plant? [M.P.P.C.S. (Pre) 2006]

Correct Answer: (d) Jatropha
Solution:Jatropha Curcas, the plant is considered a future feedstock for biodiesel production because it is easily grown in a harsh environment and is a non-edible crop. It is an Angiospermic plant.

At the time of cultivation, it needs very less amount of water compared to other plants. The seeds of these plant are used as biodiesel. Biodiesel has become more attractive because of its environmental benefits and is obtained from renewable resources.

24. In the context of alternative sources of energy, ethanol as a viable bio-fuel can be obtained from: [I.A.S. (Pre) 2009]

Correct Answer: (c) Sugarcane
Solution:Sugarcane ethanol is an alcohol-based fuel produced by the fermentation of sugarcane juice and molasses. Because it is a clean, affordable, and low-carbon biofuel, sugarcane ethanol has emerged as a leading renewable fuel for the transportation sector.

25. Molasses is an excellent raw material for: [Uttarakhand P.C.S. (Pre) 2002]

Correct Answer: (c) Power alcohol
Solution:

Molasses is an excellent raw material for power alcohol. These molasses are prepared by sugarcane’s juice.

Molasses contains a significant amount of fermentable sugars (around 40-50%), making it a readily fermentable substrate for yeast. The sugar in molasses is easily converted into ethanol by yeast. Molasses is a byproduct of sugar production, making it relatively inexpensive.

Molasses is a readily available byproduct of sugar production, making it a practical choice for ethanol production. Ethanol produced from molasses can be used as a fuel, industrial solvent, or in the production of alcoholic beverages like rum.

26. We obtain chilgoza from the seed of species - [U.P.P.C.S. (Pre) 2009]

Correct Answer: (a) Pine
Solution:

Pinus gerardiana is the biological name of chilgoza pine. Chilgoza is rich in carbohydrate and protein and is obtained from pine seeds. Cycas belongs to the group of gymnosperms, a group of plants that produce seeds without a fruit covering.

Palms are angiosperms, which are flowering plants where seeds are enclosed in a fruit. Cedar is also a gymnosperm, but not the same as Cycas.

27. The chief mosquito repellent is obtained from - [U.P.P.C.S. (Mains) 2004]

Correct Answer: (c) Margo (Neem)
Solution:The chief mosquito repellent is obtained from neem. Neem has medicinal quality, and medicines are prepared by its seeds and leaves. Basil and turmeric have antibiotic quality. Lemon is the main source of vitamin C.

28. Match List-I and List-II and select the correct answer from the codes given the lists: [U.P.P.C.S. (Mains) 2004, U.P.P.C.S. (Mains) 2008]

List-I (Plant)List-II (Use)
A. Brahmi1. Anti-diabetic
B. Sadabahar2. Carminative
C. Pudina3. Expectorant
D. Tulsi4. Brain Tonic

Code:

 

CodeABCD
(a)1234
(b)4123
(c)3214
(d)2431
Correct Answer: (b)
Solution:Brahmi is also known as jalnimbi. It commonly grows in marshy areas. It is a nervine tonic or brain tonic which acts as an anxiety agent and is used in several mental disorders. Pudina is a digestive ingredient. It promotes digestion, relieves from gas trouble (carminative), fights aches and pains, and helps to relieve from a cough and cold.

Tulsi, also known as Ocimum tenuiflorum, is an important medicinal plant with immense benefits right from clear skin to dissolving kidney stones; it also helps in removing cough or it behaves like an expectorant agent. Sadabahar is evergreen every season. It has been found useful in treating diabetes.

29. Soft drinks such as cocoa contain significant quantities of: [I.A.S. (Pre) 2000]

Correct Answer: (a) Caffeine
Solution:Cocoa is a non-alcoholic beverage which is obtained from Cacao plant (Theobroma cacao), which belongs to family Sterculiaceae.

The roasted cocoa beans contain fat which is known as cocoa butter (30-56%), starch (15%), albuminoids (15%) and mineral matter. The stimulating qualities are due to the presence of theobromine (3.0%) and a small quantity of caffeine.

30. The alkaloid caffeine is present in: [U.P. P.C.S. (Pre) 2016]

Correct Answer: (c) Tea and coffee both
Solution:Caffeine is a naturally occurring compound found in the leaves and fruits of certain plants. It is found in coffee, tea, cocoa, cola, soft drinks. As a stimulant, caffeine acts on the brain and nervous system. In small doses, it can make anyone feel refreshed and focused. While in large doses, it can make to feel anxious and have difficulty in sleeping.