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Published on: 29/01/2021
12th Standard Bio-Botany English Medium Economically useful Plants Reduced Syllabus Important Questions 2021
Download Tamil Nadu 12th Standard Biology question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Biology Test1.
Identify the mismatched pair:
Holy basil - Ocimum sanctum
Indian gooseberry - Phyllanthus amarus
Vilvam - Aegle marmelos
Veldt grape - Cissus quadrangularis
2.
Identify the incorrect statements:
(a) Morphine is used as potent hepatoprotective.
(b) Phyllanthin is used as a strong analgesic in surgery.
(c) Indian Acalypha is used to cure skin diseases.
(d) Cissus quadrangularis is widely used for treating bone fractures.
a and c
a and d
b and c
a and b
3.
The plant source of Marijuana is ________
Andrograph is paniculata
Phyllanthus maderspatensis
Cannabis sativa
Papaver somniferum
4.
Assertion (A): Turmeric is used to treat cancer.
Reason (R): Curcumin is biomolecule present in turmeric.
A is right R is wrong
Both A and R are wrong
A is wrong R is right
A and R are right. R explains A.
5.
Statement 1: Aloevera belongs to the family Asphodelaceae.
Statement 2: Jasminum grandiflorum belongs to the family of Oleaceae.
Statement 1 is correct and Statement 2 is also correct
Statement 1 is correct and Statement 2 is incorrect
Statement 1 is incorrect and Statement 2 is correct
Both the Statements are incorrect
6.
Statement 1: Andrographis paniculata is known as King of Bitters.
Statement 2: The decoction of Andrographis is used against Diabetes mellitus.
Statement 1 is correct and Statement 2 is also correct
Statement 1 is correct and Statement 2 is incorrect
Statement 1 is incorrect 'and Statement 2 is correct
Both the Statements are incorrect
7.
Pigeon pea is the common name for _______
Vigna radiata
Vigna mungo
Cajanus cajan
Sorghum vulgare
8.
Identify the Tamil name for flaked rice
Nel
Aval
Pori
Umi
9.
Given below are the plant species and their parts used. Which is the incorrect pair(s)?
(i) Cajanus cajan : Seeds
(ii) Anacardium occidentale: nuts
(iii) Borassus flabellifer: Endosperm
(iv) Capsicum annum: leaves
i and ii
ii and iii
iii only
iv only
10.
Paddy, Wheat and Sorghum, etc., comes under the category of cereals. All the members of cereals belong to which of the following family?
Fabaceae
Poaceae
Leguminoneae
Caesalpinaeceae
11.
12.
Observe the following statements and pick out the right option from the following:
Statement I: The drug sources of Siddha include plants, animal parts, ores and minerals.
Statement II: Minerals are used for preparing drugs with long shelf-life.
Statement I is correct
Statement II is correct
Both statements are correct
Both statements are wrong
13.
New world species of cotton _____.
Gossypium arboretum
G. herbaceum
Both a and b
Gossypium barbadense
14.
15.
Consider the following statements and choose the right option.
i) Cereals are members of grass family.
ii) Most of the food grains come from monocotyledon.
(i) is correct and (ii) is wrong
Both (i) and (ii) are correct
(i) is wrong and (ii) is correct
Both (i) and (ii) are wrong
16.
What does NCB stands for? Mention its role.
17.
Mention any two Jute species.
18.
How coffee plants are introduced to India
19.
Point out the uses of sugarcane.
20.
Name any four millet varieties.
21.
22.
Give definitions for organic farming?
23.
Write the cosmetic uses of Aloe.
24.
Complete the statements.
(a) Alphonsa is a variety of_________
(b) Cayenne pepper is a variety of __________
25.
Mention the plant species or their products which are popularly known as
(a) Queen of species
(b) Black Gold of India and
(c) King of bitters.
26.
What are organic pesticides?
27.
Write a note on origin and area of cultivation of cotton.
28.
Write a short note on foxtail millet.
29.
What are the King and Queen of spices? Explain about them and their uses.
30.
Give an account of active principle and medicinal values of any two plants you have studied.
31.
Write the uses of nuts you have studied.
32.
Enumerate the uses of turmeric
33.
What are millets? What are its types? Give example for each type.
34.
Which is called as the “King of Bitters”? Mention their medicinal importance.
35.
36.
Discuss which wood is better for making furniture.
37.
Explain the stepwise preparation of Bio-pest repellent from the leaves of Azadirachta indica
38.
Write the botanical name, origin, cultivational area and uses of Black gram.
Botanical name : Vigna mungo
39.
40.
What are psychoactive drugs? Add a note Marijuana and Opium
41.
42.
Write the origin and area of cultivation of green gram and red gram.
1.
(b)
Indian gooseberry - Phyllanthus amarus
2.
(d)
a and b
3.
(c)
Cannabis sativa
4.
(d)
A and R are right. R explains A.
5.
(a)
Statement 1 is correct and Statement 2 is also correct
6.
(b)
Statement 1 is correct and Statement 2 is incorrect
7.
(c)
Cajanus cajan
8.
(b)
Aval
9.
(d)
iv only
10.
(b)
Poaceae
11.
(b)
12.
(b)
Statement II is correct
13.
(d)
Gossypium barbadense
14.
(a)
15.
(b)
Both (i) and (ii) are correct
16.
The Narcotics Control Bureau (NCB) is the nodal drug law enforcement and intelligence agency of India and is responsible for fighting drug trafficking and the abuse of illegal substances.
17.
(a) Corchorus capsularis
(b) Corchorus olitorius
18.
Coffee arabica is the prime source of commercial coffee which is native to the tropical Ethiopia. An Indian Muslim saint, Baba Budan introduced coffee from Yemen to Mysore.
19.
Sugar cane is the raw material for extracting white sugar. Sugarcane supports large number of industries like sugar mills producing refined sugars, distilleries producing liquor grade ethanol and millions of jaggery manufacturing units. Fresh sugarcane juice is a refreshing drink. Molasses is the raw material for the production of ethyl alcohol.
20.
Finger millet, Sorghum, Foxtail millet and Kodo millet.
21.
22.
Organic farming is an alternative agricultural system in which plants/crops are cultivated in natural ways by using biological inputs to maintain soil fertility and ecological balance thereby minimizing pollution and wastage.
23.
1. Aloin - a mixture of glucosides.
2. Its gel used as skin tonic.
3. Cooling effect and moisturizing effect helps in creams, lotions, shampoos, shaving creams, after shave lotions preparation.
4. Used has emollient, antibacterial, antioxidant, antifungal and antiseptic.
24.
(a) Mango
(b) Capsicum
25.
| (a) | Queen of Species | Cardamom |
| (b) | Black Gold of India | Pepper |
| (c) | King of bitters | Andrographis paniculata |
26.
Pest like aphids, spider and mites can cause serious damage to flowers, fruits, and vegetables. These creatures attack the garden in swarms, and drain the life of the crop and often invite disease in the process. Many chemical pesticides prove unsafe for human and the environment. It turns fruits and vegetables unsafe for consumption. Thankfully, there are many homemade, organic options to turn to war against pests.
27.
Cotton is one of the oldest cultivated crops of the world. It has been cultivated for about 8000 years both in new world and in old world. Commercial cotton comes from four cotton species: two from the new world and two from the old world.
(1) Gossypium hirsutum
(2) G.barbadense are the New world species and
(3) G. arboretum
(4) G. herbaceum are the old world species.
In India, cotton is cultivated in Gujarat, Maharashtra, Andhra Pradesh and Tamil Nadu.
28.
Foxtail Millet
Botanical name: Setaria italica
This is one of the oldest millet used traditionally in India. Which is domesticated first in China about 6000 years. Rich in protein, carbohydrate, vitamin Band C, Potassium and Calcium. Uses It supports in strengthening of heart and improves eye sight. Thinai porridge is given to lactating mother.
29.
| Queen of Spices | King of Spices |
| Cardamom (Elettaria cardamomum) |
Black pepper (Piper nigrum) |
| Family : Zingiberaceae | Family : Piperaceae |
30.
1. It is a mixture of glucosides derived from Aloe vera.
2. Gel used as skin tonic. Gives cooling effect.
3. Creams, lotions, shampoos, shaving creams, after shave lotions. Rejuvenation of aging skin. Emollient, antibacterial, antioxidant, antifungal and antiseptic.
4. Capsaicin is an active component has pain relieving properties derived from Capsicum annum.
5. Good source of Vitamin C, A and E.
31.
| S. No | Common name | Botanical name | Uses |
| 1. | Cashew Nut | Anacardium occidentale (Family: Anacardiaceae) |
Garnishing sweets Ground for sauces _ Raw Kernels as snacks. |
32.
Curcumin extracted from turmeric - yellow colour - good anti oxidant fight against cancer - anti inflammatory, anti diabetic, anti bacterial, antifungal and anti viral activities - stops platelets from clotting.
33.
| S.No | Common name | Botanical name |
| 1 | Foxtail Millet | Staria italica |
| 2 | Kodo Millet | Paspalum scrobiculatum |
34.
1. It is Andrographis paniculata belongs to Acanthaceae family.
2. It is a potent hepatoprotective to treat liver disorders.
3. Used to make Nilavembu Kudineer to treat malaria and dengue.
35.
36.
1. Tectona grandis is the plant gives wood better for making furniture.
2. It is one of the best timber in the world.
3. The heart wood is yellow to golden brown turner darker.
4. Durability and immune to attack of termites and fungi is well known.
37.
Botanical pest repellent and insecticide made with the dried leaves of Azadirachta indica Preparation of Bio-pest repellent
(i) Pluck leaves from the neem tree and chop the leaves finely.
(ii) The chopped up leaves were put in a 50-liter container and fill to half with water; put the lid on and leave it for 3 days to brew.
(iii) Using another container, strain the mixture which has brewed for 3 days to remove the leaves, through fine mesh sieve. The filtrate can be sprayed on the plants to repel pests.
(iv) To make sure that the pest repellent sticks to the plants, add 100 ml of cooking oil and the same amount of soap water. (The role of the soap water is to break down the oil, and the role of the oil is to make it stick to the leaves).
(v) The stewed leaves from the mixture can be used in the compost heap or around the base of the plants.
38.
Black gram
(i) Botanical name : Vigna mungo.
(i) Origin and Area of cultivation : Black gram is native to India.
(ii) Earliest archeobotanical evidences record the presence of black gram about 3,500 years ago.
(iii) It is cultivated as a rain fed crop in drier parts of India.
(iv) India contributes to 80% of the global production of black gram.
(v) important states growing black gram in India are Uttar Pradesh, Chattisgarh and Karnataka.
Uses:
(i) Black gram is eaten whole or split, boiled or roasted or ground into flour.
(ii) Black gram batter is a major ingredients for the preparation of popular Southern Indian breakfast dishes.
(iii) Split pulse is used in seasoning Indian curries.
39.
40.
| psychoactive drugs | ||||
| 1 | Opium Poppy | Papaver somniferun (Family: Papaveraceae) |
Native: South East Europe, Western Asia. Cultivated in MP, Rajasthan, UP (With license) | Morphine strong analgesic during surgery - sleep, relieving Pain. |
| 2 | Cannabis/ Marijuana | Cannabis sativa (Family: Cannabiaceae) | Native: Marijuana to China Cultivated in Gujarat, HP, Uttarkand, UR, MP [with license) |
1. Trans - tetrahydrocannabinol (THC) - cures hypertension, Glucoma, nausea of cancer patients of radio and chemotherapy. 2. Cures bronchial disorder, asthma. |
41.
42.
| S.No | Common Name | Botanical name | Origin and area |
| 1 | RED GRAM | Cajanus cajan | Southern India, cultivated in Maharashtra, Andhra Pradesh, Madhya Pradesh Karnataka and Gujarat |
| 2 | GREEN GRAM | Vigna radiate | State of Maharashtra. Cultivated in Madhya Pradesh, Karnata and Tamil Nadu. |
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