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Published on: 29/01/2021
12th Standard Bio-Botany English Medium Economically useful Plants Reduced Syllabus Important Questions With Answer Key 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 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
2.
Select the new world species of cotton.
(i) Gossypium hirsutum
ii) Gossypium barbadense
(iii) Gossypium arboreum
(iv) Gossypium herbacecum
i and ii only
i and iii only
iii and iv only
ii and iv only
3.
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
4.
Statement 1: Chinese discovered the paper.
Statement 2: Eucalyptus and Casuarina are the widely used tree species for making paper pulp.
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
5.
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
6.
Match the common names of the given plant species with their respective binomial
| (A) | Paddy | (I) | Vigna radiata |
| (B) | Lady's finger | (II) | Titicum aestivum |
| (C) | Wheat | (III) | Oryza sativa |
| (D) | Green gram | (IV) | Abelmoschus esculentus |
A-iii, B-iv, C-ii and D-i
A-ii, B-iii, C-i and D-iv
A - i, B - iii, C - iv and D - ii
A - i, B - ii, C - iv and D - iii
7.
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
8.
9.
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
10.
Observe the following statements and pick out the right option from the following:
Statement I – Perfumes are manufactured from essential oils.
Statement II – Essential oils are formed at different parts of the plants.
Statement I is correct
Statement II is correct
Both statements are correct
Both statements are wrong
11.
Find out the correctly matched pair.
Rubber-Shorea robusta
Dye-Lawsonia inermis
Timber-Cyperus papyrus
Pulp-Hevea brasiliensis
12.
13.
New world species of cotton _____.
Gossypium arboretum
G. herbaceum
Both a and b
Gossypium barbadense
14.
Tectona grandis is coming under family _____.
Lamiaceae
Fabaceae
Dipterocaipaceae
Ebenaceae
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.
Name the plant species used for making paper pulp.
18.
Mention any two Jute species.
19.
Why do we take vegetables in our diet?
20.
Name the family does the cereals and pulses belong to.
21.
Write the health benefits of Kodo millet.
22.
Give the binomials of paddy and wheat.
23.
Give an account on the role of Jasminum in perfuming
24.
25.
Name the humors that are responsible for the health of human beings.
26.
27.
Complete the statements.
(a) Alphonsa is a variety of_________
(b) Cayenne pepper is a variety of __________
28.
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.
29.
What are organic pesticides?
30.
Write a note on origin and area of cultivation of cotton.
31.
Give a botanical name of green gram and write its origin and area of cultivation and uses.
32.
What are the King and Queen of spices? Explain about them and their uses.
33.
Write the uses of nuts you have studied.
34.
Enumerate the uses of turmeric
35.
What are millets? What are its types? Give example for each type.
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.
Give a detailed account on anyone fibre yielding plant.
39.
Write the botanical name, origin, cultivational area and uses of Black gram.
Botanical name : Vigna mungo
40.
What are psychoactive drugs? Add a note Marijuana and Opium
41.
42.
What is TSM? How does it classified and what does it focuses on?
1.
(d)
a and b
2.
(a)
i and ii only
3.
(a)
Statement 1 is correct and Statement 2 is also correct
4.
(a)
Statement 1 is correct and Statement 2 is also correct
5.
(d)
iv only
6.
(a)
A-iii, B-iv, C-ii and D-i
7.
(b)
Poaceae
8.
(c)
9.
(b)
Statement II is correct
10.
(c)
Both statements are correct
11.
(b)
Dye-Lawsonia inermis
12.
(c)
13.
(d)
Gossypium barbadense
14.
(a)
Lamiaceae
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.
Wood of Melia azadirachta, Neolamarkia chinensis, Casuarina spp and Eucalyptus spp are used for making paper pulp.
18.
(a) Corchorus capsularis
(b) Corchorus olitorius
19.
Vegetables are the important part of healthy eating and provide many nutrients, including potassium, fiber, folic acid and vitamins A, E and C. The nutrients in vegetables are vital for maintenance of our health
20.
Cereals belong to the family Poaceae.
Pulses belong to the family Fabaceae.
21.
Kodo millet is a good diuretic and cures constipation. Helps to reduce obesity, blood sugar and blood pressure.
22.
Paddy: Oryza sativa.
Wheat: Triticum aestivum.
23.
1. Used for worship, ceremonial purposes, incense and fumigants, making perfumed hair oils, cosmetics and soaps.
2. Used for soothing, relaxing antidepressant qualities.
24.
25.
Vatam, Pittam and Kapam.
26.
27.
(a) Mango
(b) Capsicum
28.
| (a) | Queen of Species | Cardamom |
| (b) | Black Gold of India | Pepper |
| (c) | King of bitters | Andrographis paniculata |
29.
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.
30.
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.
31.
Botanical name: Vigna radiata
Origin and Area of cultivation: Green gram is a native of India and the earliest archaeological evidences are found in the state of Maharashtra.
It is cultivated in the states of Madhya Pradesh, Karnataka and Tamil Nadu.
Uses
It can be used as roasted, cooked and sprouted pulse. Green gram is one of the ingredients of pongal, a popular breakfast dish in Tamil Nadu. Fried dehulled and broken or whole green gram is used as popular snack. The flour is traditionally used as a cosmetic, especially for the skin.
32.
| Queen of Spices | King of Spices |
| Cardamom (Elettaria cardamomum) |
Black pepper (Piper nigrum) |
| Family : Zingiberaceae | Family : Piperaceae |
33.
| S. No | Common name | Botanical name | Uses |
| 1. | Cashew Nut | Anacardium occidentale (Family: Anacardiaceae) |
Garnishing sweets Ground for sauces _ Raw Kernels as snacks. |
34.
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.
35.
| S.No | Common name | Botanical name |
| 1 | Foxtail Millet | Staria italica |
| 2 | Kodo Millet | Paspalum scrobiculatum |
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.
Jute
Botanical name : Corchorus spp.
Family: Malvaceae
Origin and Area of cultivation: Jute is derived from the two cultivated species (1) Core horns capsularis and (2) Colittorius is of African origin whereas C. Capsularis, is believed to Indo Burmaese origin. It is an important cultivated commercial crop in Gangetic plains of India and Bangladesh.
Uses: It is one of the largest exported fibre material of India. The jute industry occupies an important place in the national economy Of India. Jute is used for 'safe' packaging in view of being natural, renewable, bio-degradable and eco-friendly product. It is used in bagging and wrapping textile. About 75% of the jute produced is used for manufacturing sacks and bags. It is also used in manufacture of blankets, rags, curtains etc. It is also being used as a textile fibre in recent years.
39.
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.
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.
TSM indicates Traditional Systems of Medicines. It has been classified into institutionalized and non institutionalized methods.
| S.No | Institutionalized | Non - Institutionalized |
| 1 | Two thousand years practice | No such records |
| 2 | Prescribed texts are available | Only oral form by rural and tribal peoples |
| 3 | Focuses on symptoms, disease diagnosis, drugs to cure, preparation of drugs, dosage | Focuses on healthy diet for maintaining good health and disease reversal. |
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