Explore topic-wise InterviewSolutions in Current Affairs.

Oxygen : It is the element that have a key role in respiration, it helps to burn the food material and release the energy.

The Earth Summit was held at Rio de Janeiro (Brazil) between 3–14 June, 1992.

Bronchi : The branches of wind pipe extending into the lungs and further branching into bronchioles

• Carbon dioxide : It is the gas that released in respiration
• Gills : These are the respiratory organs in aquatic animals like fishes.

Tracheae : Respiration that take place via trachea is called Tracheal respiration. This is present in all insects.

Cryopreservation is a preservation technique in which sperms, eggs, cells, tissues, etc., are stored at ultra-low temperature of −196^∘C under nitrogen. Cells and gametes of threatened species can be preserved by this method.

i. Decline in plant production and animal species 

ii. Lowered resistance to environmental perturbations such as drought 

iii. Increased variability in certain ecosystem processes such as plant productivity/water use/pest and disease cycles. 

iv. Increased rate of species extinction.

(i) Identification: DNA finger printing is a sure method of identification of criminals involved in various types of crime including rape and murder.

(ii) Close relations: DNA finger printing can establish the closeness of relation of an intending immigrant.

Correct answer is (C) Onion

Correct Answer is: (C) Onion 

A well-known example is an onion. Bulbs are often described as tunicate or non-tunicate based on their structure. 

A tunicate bulb has a papery, outer scale called a tunic that helps prevent it from drying out. Examples include onion, garlic, narcissus, and amaryllis

Correct Answer is: (C) Triploid

• In angiosperms the endosperm is a special tissue which is formed as a result of vegetative fertilization, triple fusion or fusion of a male gamete with diploid secondary nucleus of the central cell. 

• The fusion product is primary endosperm cell having a triploid endosperm nucleus. 

(C) Sweat gland

(C) Triploid

Food chain: Food chain is that food relation in which every leaving body eats another living body in front and it is eaten by the back living body. This process cercoleted in every time as change system. Hence this change system of use of food is called food chain by this chain system the energy is also transformed forest ecosystem:

Plant → Rat → Snake → Hawk

 In the above discussion of ecosystem the plant is producer, Rat is primary consumer, snake is secondary consumer and hawk is third consumer.

Correct answer is (C) Banana

Correct Answer is: B. Periyar Sanctuary

Wild Elephant, Periyar National Park. Periyar National Park and Wildlife Sanctuary (PNP) is a protected area near Thekkady in the districts of Idukki, Kottayam and Pathanamthitta in Kerala, India. It is notable as an elephant reserve .

(A) Calotropis

Correct Answer is: (B) Human being 

Hoemochorial placenta in which the maternal blood is in direct contact with the Chorion. The human placenta is of this type.

Correct Answer is: B. Agrobacterium tumefaciens 

This bacterium establishes contact with suitable root cells of plants by recognising chemical signals and then prepares its plasmid ready to be delivered through t-piles developed by type IV secretion system.

So, Agrobacterium tumefaciens is called the Natural genetic engineers of plants.

Correct Answer is: (A) Calotropis 

Pollinia or singularly known as pollinium is a coherent mass of pollen grains of a plant of one anther and during pollination are transferred as a single unit. A regular feature of orchids a species of milkweeds is also found in Calotropis gigantea.

जनन जीवों का एक अति महत्त्वपूर्ण लक्षण है। यह एक अति आवश्यक जैविक प्रक्रिया है। जिसके द्वारा न सिर्फ जीवों की उत्तरजीविता में मदद मिलती है बल्कि इससे जीव-जाति की निरन्तरता भी बनी रहती है। जनन जीवों के अमरत्व में भी सहायक होता है। प्राकृतिक मृत्यु, वयता वे जीर्णता के कारण होने वाले जीव ह्रास की आपूर्ति, जनन द्वारा ही होती है। जनने से जीवों की संख्या बढ़ती है। जनन एक ऐसा माध्यम है जिसके द्वारा लाभदायक विभिन्नताएँ एक पीढ़ी से दूसरी पीढ़ी तक स्थानान्तरित होती हैं। अत: जनन जैव विकास में भी सहायक होता है। इन समस्त कारणों के आधार पर कहा जा सकता है कि जनन जीवों के लिए अनिवार्य है।

(C) Both A and B 

Correct Answer is: (C) Both A and B

Deserts, where the environment is generally hot and extremely dry, provide many striking examples of how plants and animals are adapted to their surroundings. 

Plants have many adaptations to cope with the lack of water. Some desert plants, such as the barrel cactus, have expandable stems for storing water.

A women who cannot conceive can have a baby by special technique. Ovum from mother is taken out, fertilized in the lab, the embryo is reimplanted into the uterus. Embryo develops into a normal baby. The offspring thus produced is called a test tube baby. It is done by IVF invitro fertilization and embryo transfer techniques.

The boy moves to the higher class. He is worried that he would miss his teacher-friend. As a young boy, he fails to understand that great teacher’s concern for him.

The teacher listens to the boy. He offers the boy comfort. He provides the boy with the needed courage. He brings out the boy’s real soul. He finds time to see if the boy is fine. In the company of this teacher-friend, the boy is all smiles.

The hard chewing surface of the teeth is made of enamel and helps in mastication of food.

The food that we eat are macromolecules, and inabsorbable. These are to be broken down . into smaller micro-molecules in absorbable forms. This is done by digestive system.

Plants are autotrophs. They prepare their own food using CO₂ , H₂O in the presence of sunlight trapped by the chlorophyll pigment present in the leaves. There is no need of digestive system for plants as they use the starch as such.

The function of the digestive system is to bring the nutrients, water and electrolytes from the external environment into every cell in the body through the circulatory system.

Mineral salts like calcium and magnesium are deposited on the teeth and form a hard layer of ‘tartar’ or calculus called plaque. If the plaque formed on teeth is not removed regularly, it would spread down the tooth into the narrow gap between the gums and enamel and causes inflammation, called gingivitis, which leads to redness and bleeding of the gums and to bad smell.

(d) sodium chloride

(d) salt and base

Every tooth in human beings is embedded in a socket in the jaw bone. This type of attachment is called the codont dentition.

(d) acidic, basic or neutral

1. Hydrochloric acid present in our stomach helps in the digestion of foodstuff. 

2. Vinegar (acetic acid) is used to preserve food materials. 

3. Benzoic acid is also used to preserve food materials like pickles. 

4. Sodium or potassium salts of higher fatty acids are used to make washing and bathing soaps.

5. Sulphuric acid is called the king of chemicals. It is an effective dehydrating agent. It is used in various industries to make detergents, paints, fertilizers and many more chemicals. 

6. Hydrochloric acid, Nitric acid and Sulphuric acid are important laboratory reagents. 

7. Cells of all living organisms contain the fundamental nuclear material called nucleic acids. Animals have deoxyribo nucleic acid (DNA) whereas plants contain ribo nucleic acid (RNA).

Quicklime is used to neutralise the acidic soil.

No, all acids are not corrosive in nature. Certain acids like acetic acid present in vinegar, citric acid present in citrus fruits, lactic acid present in curd, oxalic acid present in tomatoes, etc, are part of our food and non-corrosive in nature.

Acids are sour in taste.

Human beings and many mammals form two sets of teeth during their life time, a set of 20 temporary milk teeth which gets replaced by a set of 32 permanent teeth. This type of dentition is called diphyodont dentition.

1. sour 

2. electricity 

3. Acids 

4. Vinegar 

5. Sulphuric acid 

6. bitter 

7. alkalis 

8. Baking soda 

9. hydrochloric acid 

10. majenta

Correct option is (A) Skin and respiratory, diseases

1. Degree(CD) - the number of Columns is the Degree 

Cardinality (RC)-: the number of Rows is the Cardinality 

T1 ∪ T2 = Sum of cardinalities of Table 1 and Table 2 

i.e. T1 ∪ T2 = 10 + 8 = 18.

2. T1 ∩ T2 is the common rows(tuples) in T1 and T2 If there is no common tuples then T1 n T2 is 0 hence the cardinality is 0.

(d) All of the above