Showing posts with label class12-Biology. Show all posts
Showing posts with label class12-Biology. Show all posts

Saturday, 23 April 2022

Class 12 Biology - Biotechnology and Its Applications (MCQs) #biotechnology #biologyMCQs #class12Biology #eduvictors

Class 12 Biology - Biotechnology and Its Applications (MCQs)

Class 12 Biology - Biotechnology and Its Applications (MCQs) #biotechnology #biologyMCQs #class12Biology #eduvictors


Q1(NEET 2021): A specific recognition sequence identified by endonucleases to make cuts at specific positions within the DNA is:

(a) degenerate primer sequence

(b) Okazaki sequences

(c) palindromic nucleotide sequence

(d) poly(A) tailsequence


Wednesday, 20 April 2022

Class 12 Biology - Biotechnology: Principles and Processes (MCQs) #biologyQuiz #Biotechnology #eduvictors

Class 12 Biology - Principles and Processes (MCQs)

Class 12 Biology - Biotechnology: Principles and Processes (MCQs) #biologyQuiz #Biotechnology  #eduvictors




Q1: The linking of antibiotic resistance gene with the plasmid vector became possible with

(a) DNA polymerase 

(b) exonucleases

(c) DNA ligase 

(d) endonucleases

Monday, 18 April 2022

Class 12 Biology -Human Health and Diseases (MCQs) #class12Biology #BiologyMCQs #eduvictors

Class 12 Biology -Human Health and Diseases (MCQs)

Class 12 Biology -Human Health and Diseases (MCQs) #class12Biology #BiologyMCQs #eduvictors


Q1: The organisms which cause diseases in plants and animals are called:

(a) Pathogens 

(b) Vectors

(c) Insects 

(d) Worms


Q2: The sporozoites that cause infection, when a female Anopheles mosquito bites a person, are formed in:

(a) Liver of the person

(b) RBCs of mosquito

(c) Salivary glands of the mosquito

(d) Intestine of mosquito

Wednesday, 13 April 2022

Class 12 Biology - Microbes in Human Welfare (MCQs) #biologyquiz #class12Biology #NEET #eduvictors

Class 12 Biology - Microbes in Human Welfare (MCQs)

Class 12 Biology - Microbes in Human Welfare (MCQs) #biologyquiz #class12Biology #NEET #eduvictors


Q1: A common biocontrol agent for the control of plant diseases is

(a) baculovirus 

(b) Bacillus thuringiensis

(c) Glomus 

(d) Trichoderma


Q2: Methanogens do not produce 

(a) oxygen 

(b) methane

(c) hydrogen sulfide 

(d) carbon dioxide

Saturday, 9 April 2022

Class 12 Biology - Organisms and Population MCQs #biologyquiz #class12Biology #eduvictors

Class 12 Biology - Organisms and Population MCQs

Class 12 Biology - Organisms and Population MCQs #biologyquiz #class12Biology #eduvictors


Q1. A majority of organisms that are restricted to a narrow range of temperature are called as

(a) stenothermal 

(b) endothermal

(c) ectothermal 

(d) eurythermal

Wednesday, 6 April 2022

Class 12 Biology - Biodiversity and Its Conservation (MCQs) #biologyquiz #eduvictors

Class 12 Biology - Biodiversity and Its Conservation (MCQs)

Class 12 Biology - Biodiversity and Its Conservation (MCQs) #biologyquiz #eduvictors



Q1. Which one is the most important human activity leading to extinction of wildlife?

(a) Alteration and destruction of the natural habitats.

(b) Hunting for commercially valuable wildlife products.

(c) Pollution of air and water.

(d) Introduction of alien species. 

Wednesday, 2 March 2022

DISORDERS OF THE CIRCULATORY SYSTEM - Class 12 Biology - Pre-Medical - Human Health and Diseases #NEET #Biology #HeartDiorders #biology

DISORDERS OF THE CIRCULATORY SYSTEM

Biology - Human Health and Diseases

DISORDERS OF CIRCULATORY SYSTEM - Class 12 Biology - Pre-Medical - Human Health and Diseases #NEET #Biology #HeartDiorders #biology


Following are the diseases that can affect the circulatory system:

Hypertension:

It is the most common disease affecting the heart and blood vessels. A blood pressure of 120/80 mmHg is considered normal. But the increase in blood pressure beyond 140 mmHg (systolic) and 90 mmHg (diastolic) is called high blood pressure (hypertension). A diet full of oily food is known to increase cholesterol levels, causing thickening of the arteries which results in high blood pressure. Tobacco smoking increases the heart rate, contracts blood vessels and raises blood pressure. High blood pressure can harm the heart, brain, kidneys and eyes.

Wednesday, 23 February 2022

Class 12 - Biology - Biotechnology and Its Applications (Very Short Answer Based Questions - Solved) #class12Biology #biotechnology #eduvictors

Class 12 - Biology - Biotechnology and Its Applications (Very Short Answer Based Questions - Solved)

Class 12 - Biology - Biotechnology and Its Applications (Very Short Answer Based Questions - Solved) #class12Biology #biotechnology #eduvictors


Q1. What are Transgenic crops?

Answer: Genetically modified crops that contain or express one or more useful foreign genes are called transgenic crops.


Q2. What are transgenic animals? Give an example.

Answer:  Animals manipulated with the foreign gene and have the ability to express it are transgenic animals. e.g. Rosie, a transgenic cow produced milk containing human alpha-lactalbumin.


Q3. What is BT toxin?

Answer: Bt toxin is an intracellular crystalline protein. It exists as an inactive protoxin that once ingested by an insect, gets activated, binds to the surface of midgut epithelial cells. This causes cell swelling and lysis, leading to the death of an insect.

Thursday, 20 January 2022

CBSE Class 12 Term 2 Sample Question Papers 2021-22 #class12papers #cbsepapers #eduvictors

CBSE Class 12 Term 2 Sample Question Papers 2021-22

CBSE Class 12 Term 2 Sample Question Papers 2021-22 #class12papers #cbsepapers #eduvictors
CBSE (Central Board of Secondary Education) has released the Sample Question Papers for Class 10 and Class 12 Term 2 in the academic year 2021-22.

CBSE (Central Board of Secondary Education) has released the Sample Paper for Class 10 12 Term 2 Exams 2022. CBSE released the sample papers on their official website for both the Classes 10th and 12th and these papers are in a subjective format. 

Students can check the sample paper at https://cbseacademic.nic.in/ 

These papers are in a subjective format. 

Saturday, 23 October 2021

CBSE Class 12 Biology Term 1 MCQs (#class12Biology)(#biology)(#cbseterm1)(#biologymcqs)

CBSE Class 12 Biology Term 1 MCQs

CBSE Class 12 Biology Term 1 MCQs (#class12Biology)(#biology)(#cbseterm1)(#biologymcqs)


Q1: The outermost and innermost wall layers of microsporangium in an anther are respectively.

(a) Endothecium and tapetum

(b) Epidermis and endodermis

(c) Epidermis and middle layer

(d) Epidermis and tapetum



Q2: Which of the following fruit is a case of parthenogenesis?

(a) Fruit without seeds after pollination

(b) Fruit with seeds after pollination

(c) Fruit with viable seeds without fertilization 

(d) Fruit with viable seeds after fertilization.

Wednesday, 14 July 2021

Biology Quiz - 6 (#NEET)(#premedical)(#AIPMT)(#class12Biology)(#eduvictors)(#class11Biology)(#class12Biology)

Biology Quiz - 6 

Biology Quiz - 6 (#NEET)(#premedical)(#AIPMT)(#class12Biology)(#eduvictors)(#class11Biology)


Q1: Which of the following statements is wrong for viroids?

(a) They cause infections.

(b) Their RNA is of high molecular weight.

(c) They lack a protein coat.

(d) They are smaller than viruses.

Friday, 25 June 2021

CBSE Class 12 - Biology - Chapter 1: Reproduction in Organisms (Questions and Answers)(#class12Biology)(#eduvictors)

CBSE Class 12 - Biology - Chapter 1: Reproduction in Organisms (Questions and Answers)

CBSE Class 12 - Biology - Chapter 1: Reproduction in Organisms (Questions and Answers)(#class12Biology)(#eduvictors)


Q1: Define life span.

Answer: Life span is the period from birth to the natural death of an organism.


Q2: What is the life span of the following organisms?

(a) Mayfly

(b) Human Being

(c) Parrot

(d) Rice Plant

(e) Sequoia Trees

(f) Butterfly


Answer

(a) Mayfly - 1 day

(b) Human Being - 100 years

(c) Parrot - 140 years

(d) Rice Plant - 3 to 4 months

(e) Sequoia Trees - 3000 to 4000 years

(f) Butterfly - 1 to 2 weeks

Sunday, 18 April 2021

Class 12 - Biology - Reproduction in Organisms (Very Short Answer Based Questions)(#eduvictors)(#class12Biology)

Class 12 - Biology - Reproduction in Organisms (Very Short Answer Based Questions)

Class 12 - Biology - Reproduction in Organisms (Very Short Answer Based Questions)(#eduvictors)(#class12Biology)

Q1(MCQ): Clones are

(a) Morphologically similar 

(b) Genetically similar

(c) Both (a) and (b) 

(d) None of these


Answer: (c) Both (a) and (b) 

Clones are morphologically and genetically similar individuals.


Q2: Define Parthenogenesis.

Answer: Parthenogenesis is the development of an egg into an embryo without fertilisation. e.g. in rotifers, honeybees, turkey and some lizards.

Sunday, 21 March 2021

Class 12 - Biology - Understanding Immunity (Q & A) - Chapter: Human Health and Diseases (#class12Biology)(#cbsenotes)(#eduvictors)(#immunity)

Class 12 - Biology - Understanding Immunity (Q & A) - Chapter: Human Health and Diseases

Class 12 - Biology - Understanding Immunity (Q & A) - Chapter: Human Health and Diseases (#class12Biology)(#cbsenotes)(#eduvictors)(#immunity)


Q1: Define immunity.


Answer: Immunity means resistance to infections and antigens. Immunity is the capacity of an organism to resist or defend itself from the development of a disease.


Q2: What is an antigen? Give some examples.


Answer: Any substance or molecule that induces the immune system to produce antibodies against it is called an antigen.  Examples include pathogens, virus, pollens, chemicals etc.


Q3: Name two main types of immunities.


Answer

1. Innate immunity

2. Acquired immunity

Thursday, 4 March 2021

Biology: Know Your Vitamin Quiz (#biology)(#NEET)(#PreMedical)(#Class12Biology)(#compete4exams)(#eduvictors)

Know Your Vitamins Quiz

Biology: Know Your Vitamin Quiz (#biology)(#NEET)(#PreMedical)(#Class12Biology)(#compete4exams)(#eduvictors)



1. What is the source of Vitamin A in Leafy vegetables?




2. Which Vitamin is known as the anti-infetive vitamin




3. Which Vitamin is used for ELISA test (AIDS)?




4. Which Vitamin contains Cobalt?




Saturday, 3 October 2020

Biology - Scientific Names (#Class11Biology)(#NEET)(#Class12Biology)(#Class9Biology)

 Biology - Scientific Names 

Biology - Scientific Names (#Class11Biology)(#NEET)(#Class12Biology)(#Class9Biology)


1. Swedish botanist Carolus Linnaeus established binomial nomenclature. 

2. Caper Bauhin expressed proposed binomial nomenclature for the first time 

3. In binomial nomenclature, the first word is a generic name having first letter capital and second word is a  specific epithet having first letter. e.g.  Homo sapiens, Mangifera indica

4. After end of biological name, the name of author is written in abbreviated form who gave the name to that organism.

5. Both the words of a biological name when handwritten are separately underlined and when printed are typed in italics to indicate their Latin origin and also give respect to the name.

Monday, 24 August 2020

CBSE Class 11 Biology - The Living World - An Overview of Virus and Viroids (#class11biology)(#viruses)(#viroids)(#eduvictors)

An Overview of Virus and Viroids ( Q & A)

CBSE Class 11 Biology - The Living World 

CBSE Class 11 Biology - The Living World - An Overview of Virus and Viroids  (#class11biology)(#viruses)(#viroids)(#eduvictors)


Q1: Do five kingdom classification include viruses, viroids and lichens?

Answer: Five kingdom system of classification do not includes Virus, Viroids and Lichens.


Q2: What is a virus? What is its structure?

Answer: Viruses are non-cellular organisms having inert crystalline structure outside the living. A virus is a small particle consisting of a nucleic acid core surrounded by a protein coat; in order to reproduce, a virus must infect a living cell.

Monday, 9 December 2019

CBSE Class 12 - Biology - Chapter - Evolution - Questions and Answers (#class12Bioogy)(#eduvictors)

Chapter - Evolution - Questions and Answers

CBSE Class 12 - Biology

CBSE Class 12 - Biology - Chapter - Evolution - Questions and Answers (#class12Bioogy)(#eduvictors)

1- Mark Questions


Q1: Who proposed Big Bang theory?

Answer: Abbe Lemaitre in 1931.


Q2: Who proposed Panspermia theory?

Answer:  Richter in 1865.


Q3: What was Panspermia theory?

Answer: Panspermia theory stated that  life came from outside in the form of spores.

Thursday, 31 October 2019

Biology Quiz-5 (AIPMT/NEET/CET) (#biologyquiz)(#eduvictors)

Biology Quiz-5 

(AIPMT/NEET/CET)
Biology Quiz-5 (AIPMT/NEET/CET) (#biologyquiz)(#eduvictors)


Multiple Choice Questions

Q1: A particular species of plant produces light, non sticky pollen in large numbers and its stigma are long and feathery. These modifications facilitate pollination by

(a) Insects
(b) Water
(c) Wind
(d) Animals


Wednesday, 25 September 2019

CBSE Class 12 Sample Question Papers With Marking Scheme (2019-20)(#cbsepapers)(#eduvictors)

CBSE Class 12 Sample Question Papers With Marking Scheme (2019-20)

CBSE Class 12 Sample Question Papers With Marking Scheme (2019-20)(#cbsepapers)(#eduvictors)


CBSE has released sample question papers along with marking scheme based on the new curriculum. Sample Papers for Class 12 are taken into consideration as the best option to understand the question paper pattern very well.  

Eduvictors provide collection of sample question papers prepared by various schools and institutes 
that help you to practice and get familiar with the question paper pattern. Solving an ample variety of sample papers, together with the last years' pattern papers, has been the recommendation to students.

Here are links of SQPs and Marking Schemes for various subjects: