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पी० एल० 807, वी० जे० एम० 201, पी० एल० 426

चावल-मसर, कपास-मसर, मूंगफली-मसर।

बुआई से पहले ग्रामैकसोन।

गोभी सरसों, तोरिया, तारामीरा, अलसी तथा सूर्यमुखी।

40 किलो ग्राम बीज प्रति एकड़।

साधारणतया गंधक की आवश्यकता पौधों को कम मात्रा में होती है। परन्तु तेल बीज वाली फसलों को गंधक तत्त्व की अधिक आवश्यकता होती है। गंधक (सल्फर) की कमी होने से तेल बीज फसलों की पैदावार कम हो जाती है। गंधक का प्रयोग नाइट्रोजन के प्रयोग के लिए भी आवश्यक है। एनजाइमों की गतिविधियों तथा तेल के संश्लेषण के लिए भी सल्फर बहुत आवश्यक है। इसीलिए तेल बीज फसलों में फॉस्फोरस तत्त्व के लिए सुपर फास्फेट खाद को प्राथमिकता देनी चाहिए क्योंकि इसमें सल्फर (गंधक) तत्त्व भी होता है। यदि यह खाद न मिले तो 50 कि०ग्रा० जिप्सम प्रति एकड़ का प्रयोग करना चाहिए।

सही उत्तर है चने तथा मसूर

तीन श्रेणियों में-अनाज, दालें तथा तेल बीज, चारे की फसलें।

एच०डी०-2967, डी०बी०डब्ल्यू०-17.

हैपी सीडर द्वारा

सही उत्तर है वर्ष 1957 में

सही उत्तर है राईया, अलसी

सर्व पक्षी-कीट प्रबन्ध तकनीक से।

(i)—(b), (ii)—(a), (iii)—(c), (iv)—(b).

सही उत्तर है वर्ष 1966 में।

विश्वविद्यालय बनाने का मुख्य उद्देश्य देश की अनाज सुरक्षा को विश्वसनीय बनाना था। कृषि के क्षेत्र में पैदा चुनौतियों का हल खोजना तथा स्थाई कृषि विकास के लिए कृषि खोज का पक्का ढांचा बनाना था।

मैक्सिको स्थित अन्तर्राष्ट्रीय गेहूँ तथा मक्की सुधार केन्द्र, सीमट, चावल की खोज के लिए मनीला (फिलीपीन्स) की अन्तर्राष्ट्रीय खोज संस्था, इंटरनैशनल राईस रिसर्च इंस्टीच्यूट (IRRI)।

1. He asked where she lived.

2. The instructor warned him not to drive too fast.

3. He asked if there was anyone.

4. They said that they had don their work.

5. The taxi driver asked me where I wanted to go.

6. Vasu assures them that they will win the match.

7. She requested him to bring a glass of water.

8. He exclaimed with joy that the rainbow was very beautiful.

9. I asked him what his name was.

10. They advised/ told him to attend the classes regularly.

This means that the ratio of the speed of light in air to the speed of light in diamond is equal to 2.42.

A person suffers from depression when he has low levels of noradrenaline. Noradrenaline is a neurotransmitter that plays a role in mood changes. Low levels of noradrenaline lower the signal-sending activity and make the person suffer from depression.

Importance of pH in Everyday Life 

1. Our body works within pH range of 7.0 to 7.8. 

2. Acid rain, (pH – 5.6) affects aquatic animals. 

3. Plants need specific range of pH of soil. 

4. Acids produced by stomach helps in digestion. If too much acid is formed, people take antacids e.g., milk of magnesia. 

5. Tooth decay starts when pH in mouth is lower than 5.5. Bacteria present in mouth produce acids by degradation of sugar and food particles remaining in the mouth. Rinsing mouth after eating and using toothpastes which are basic are usually practised for prevention of tooth decay.

6. Bee-stings produce acids which causes pain and irritation. Use of baking soda on the sting area gives relief. Stinging hair of nettle leaves inject methanoic acid causing burning pain.

The electrons in the outermost orbit of an atom are called valence electrons. These electrons are used in bonding; hence determine the valence of the element. In the representative elements, the outermost orbit contains electrons numbering 1 to 7 (i.e., ns¹ to ns² ns⁵) Thus, to achieve a complete octet, it should either lose all electrons in its outer most orbit or accept (8 no. of valence electrons) electrons from some other atoms. Hence, the elements in this class show a valence given by the number of the valence electrons or eight minus the number of electrons it accepts from other atoms.

The physical and chemical properties of elements are the periodic functions of their atomic numbers.

Answer is (c) End of valence electrons is marked by a big jump in ionization enthalpy.

Correct option is (d) Fe²⁺

Types of Elements: 

s-, p-, d- and f- blocks.

The elements for which the last electron has entered in s- orbital are called s- block elements, p-block elements are those for which the last electron has entered in the p – orbital, d-block elements are those in which the last electron has entered the d- orbital. The elements in which the last electron entered into the f - orbital of their atoms are called f – block elements.

Correct option is (b) The second ionization potential of Mg is greater than the second ionization potential of Na

1. They are soft metals.

2. They are highly electropositive. 

3. They are good. reducing agents. 

4. They have low melting and boiling points. 

5. They impart specific colour to the flame.

The s- and p- block elements are called main group elements or representative elements.

Correct option is (b) Be > Mg > Ca

(i) p-block elements consists of metals, non-metals and metalloids.

(ii) p-block consists of solids, liquids and gases.

s- block elements: Group-1 (Alkali metals) and Group-2 elements (Alkaline earth metals) which respectively have ns¹ and ns² outermost electronic configurations.

p- Block elements: They belongs to group- 13 to 18. The outer most electronic configuration is ns² np^{1 -6} . He (1s²) is a s- block element but is positioned with the group 18 elements (ns² np⁶) because it has completely filled valence shell and as a result, exhibits properties characteristic of other noble gases.

Ionisation energy is the amount of energy required to remove the most loosely bound electron from an isolated neutral gaseous atom.

d- block elements (Transition elements) are the elements of group 3 to 12 having outer electronic configuration (n-1) d^1-10 ns^1-2 . Four transition series are 3d, 4d, 5d and 6d. The 6d- series is incomplete. Atomic radius generally decreases across a period and increases as we descend the group. 

Atomic radius is the distance from the center of the nucleus to the point where the electron density is effectively zero.

Ionic radius is the distance from the nucleus of an ion to the point up to which the nucleus has influence on its electron cloud. 

OR 

Ionic radius is the distance from the nucleus of an ion to the outer most orbital containing electrons.

Vander Waal’s radius is one half of the distance between the nuclei of two non bonded adjacent atoms belonging to two neighboring molecules of elements in the solid-state.

Lanthanoids charecterised by the filling of 4f-orbitals, are the elements following lanthanum from ₅₈Ce to ₇₁Lu. Actinoids characterised by filling of 5f-orbitals, are the elements following actinium from ₇₀Th to ₁₀₃Lr. Characteristic outer electronic configuration is (n-2) f^1-14 (n-1) d^0-1 ns².

The literal meaning of the word yoga is yoke. It means uniting the individual spirit with the universal spirit or God. It is derived from the Sanskrit word 'yuj' which means to unite, to attach, to bind, It is the true union of our will with the will of God.

Half the inter-nuclear separation between two similar adjacent atoms belonging to the two neighbouring molecules of the same substance in the solid state is called the van der waals‘ radius of that atom.

The main aim of Yoga is control over mind. One who has conquered his mind has complete mastery of his self.

(b)The boron atoms are linked through hydrogen atoms 

(a) Covalent compounds only

(a) Boron elements show oxidation state of +3 only

Option : c. promotor