Showing posts with label class11-biology. Show all posts
Showing posts with label class11-biology. Show all posts

Thursday 11 May 2017

CBSE Class 11 - Biology -Syllabus (2017-18) (#cbsenotes)

Biology -Syllabus (2017-18)


CBSE Class 11

CBSE Class 11 - Biology -Syllabus (2017-18) (#cbsenotes)

Here presents the prescribed syllabus for Class 11 Biology for the curriculum 2017-18.


Thursday 27 April 2017

CBSE Class 11/12, AIPMT/NEET - Biology - List of Important Proteins and Their Occurrence (#cbsenotes)(#biologynotes)

List of Important Proteins and Their Occurrence



Protein Found Where
Albumin Egg White, Milk, Blood Plasma
Actin Muscle Fibres (Contractile protein)
Collagen Tendon, Bones
Casein Milk, Egg Yolk
Keratin Hair, Horn, feathers, Nail
Cytochrome Mitochondria
Elastin Arteries, Ligaments,Yellow Fibres

Thursday 23 March 2017

CBSE Class 11/12 - Biology - Environmental Biology (MCQs for AIPMT/NEET)

Environmental Biology 

CBSE Class 11/12 - Biology - Environmental Biology  (MCQs for AIPMT/NEET)

(MCQs for AIPMT/NEET)

Q1: Green-house effect is warming due to

a) infra-red rays reaching the earth
b) moisture layer in atmosphere
c) increase in temperature due to increase in carbon dioxide concentration of atmosphere
d) ozone layer of atmosphere


Q2: The relation between algae and fungi in a lichen is 

a) symbiosis
b) parasitism
c) commensalism
d) protocooperation


Q3: Major aerosol pollutant in jet plane emission is

a) Sulphur dioxide
b) carbon monoxide
c) methane
d) chlorofluoro-carbons

Monday 20 February 2017

CBSE Class 11/12/NEET/AIPMT Plants Of Interests Having Specific Features (#neet)(class11biology)(#biologyquiz)(#cbsenotes)

Plants Of Interests Having Specific Features

CBSE Class 11/12/NEET/AIPMT Plants Of Interests Having Specific Features (#neet)(class11biology)(#biologyquiz)(#cbsenotes)
Plants Of Special Interests
(image credits: wikipedia)

Very Short Q & A


Q1: Name the largest Angiosperm.

Answer: Eucalyptus sps.


Q2: Name the smallest Angiosperm.

Answer: Lemma


Q3: Name the Largest seed.

Answer: Lodoicea


Q4: Which plant has the largest leaf?

Answer: Victoria amazonica


Q5: Name the biggest orchid.

Answer: Grammato phyllum speciosum


Tuesday 13 December 2016

CBSE Open Text Based Assessment (OTBA) for classes IX & XI, 2017 is Available

Open Text Based Assessment (OTBA) 
For classes 
IX & XI  2017
Available Now
CBSE  Open Text Based Assessment (OTBA) for classes IX & XI, 2017 is Available


OTBA Material for Class 9 and Class 11 for this session (2016-2017) is available at CBSE website. Here are the links to download the pdfs.

Open Text Material for Class IX

Subject- English
Subject- Hindi
Mathematics - English - Hindi
Science - English - Hindi
Social Science - English - Hindi

Sunday 4 December 2016

CBSE Class 11/AIPMT - Plant Nutrition (MCQs)

Plant Nutrition

Biology Quiz
CBSE Class 11/AIPMT - Plant Nutrition (MCQs)
Azolla - an aquatic fern has Nitrogen Fixing capability

MCQs for AIPMT/CEET/Pre Medical


Q1: Nitrifying bacteria converts

(a) atmospheric nitrogen into soluble forms
(b) convert ammonia to nitrate
(c) ammonia to nitrogen
(d) nitrate to nitrogen.


Q2: Amino acids are mostly synthesized from

(a) mineral acids
(b) fatty acids
(c) volatile acids
(d) alpha-ketoglutaric acid


Q3: Which of the following is a micro-nutrient for plants?

(a) Pottassium
(b) Iron
(c) Iodine
(d) Zinc


Q4: If a plant’s younger leaves are yellowing but older one remains green, what could be the most probable cause of plant’s blight?

(a) Improper sunlight
(b) Lack of nitrogen fixing bacteria in soil
(c) Deficiency of immobile mineral nutrient
(d) Deficiency of mobile mineral nutrient


Q5: Enzyme involved in nitrogen assimilation is ___________.

Saturday 19 November 2016

CBSE Class 11/ Class 12/ NEET - Biology - Kingdom Fungi (MCQs)

Kingdom Fungi 

CBSE Class 11/ Class 12/ NEET - Biology - Kingdom Fungi (MCQs)
Fungus, Mushroom
credits: Copyright Pam Brophy

MCQs for AIPMT, PreMedical, NEET


Q1: Black rust of wheat is caused by ________

(a) Puccinia
(b) Mucor
(c) Aspergillus
(d) Rhizopus


Q2: Adhesive pad of fungi enters into the host with the help of

(a) mechanical pressure and enzymes
(b) hooks and suckers
(c) softening by enzymes
(d) only by mechanical pressure


Q3: Which fungal disease spreads by seed and flowers?

(a) Corn stunt
(b) Loose smut of wheat
(c) Covered smut of barely
(d) Soft rot of potato


Q4: Zygospores are formed in

(a) Puccinia
(b) Penicillium
(c) Alternaria
(d) Rhizopus.


Wednesday 2 November 2016

CBSE Class 12 - NEET - Biology - The Living World (MCQs)

Biology - The Living World

CBSE Class 12 - NEET - Biology - The Living World (MCQs)


7 MCQs from previous AIPMT/NEET question papers



Q1: The living organisms can be unexceptionally distinguished from the non-living things on the basis of their ability for

(a) responsiveness to touch
(b) interaction with the environment and progressive evolution
(c) reproduction
(d) growth and movement



Q2: There is no life on the moon due to the absence of 

(a) oxygen
(b) water
(c) light
(d) temperature



Q3: Praying Mantis is the example of 

(a) warning coluration
(b) social insects
(c) camouflage
(d) Mullerian mimicry

Monday 24 October 2016

CBSE Class 11 - Biology - Chapter 2 - Biological Classification (Q and A)

CBSE Class 11 

Biology  

Chapter 2 - Biological Classification

NCERT Chapter Solutions

CBSE Class 11 - Biology - Chapter 2 - Biological Classification (Q and A)


Q1: Discuss how classification systems have undergone several changes over a period of time?

Answer: The classification systems have undergone several changes with time.

The first attempt of classification was made by Aristotle. He classified plants as herbs, shrubs, and trees. Animals were classified on the basis of presence or absence of red blood cells. This system of classification failed to classify all the known organisms.

Linnaeus gave a two kingdom system of classification i.e. kingdom Plantae and kingdom Animalia. However, this system did not differentiate between unicellular and multicellular organisms and between eukaryotes and prokaryotes. Thus a large number of organisms could not be classified merely under the two kingdoms.

Later a five kingdom system of classification was proposed by R.H Whittaker in 1969. On the basis of characteristics, such as cell structure, mode of nutrition, presence of cell wall, etc., five kingdoms, Monera, Protista, Fungi, Plantae, and Animalia were formed.

Later Monera was divided further into Archaebacteria and  Eubacteria because Archaebacteria were different from bacteria in terms of different type of cell wall structure.


Q2: Who is known as Father of Taxonomy? Name the book he published on taxonomy. What's his the greatest contribution in naming species.

Answer: Linnaeus. In 1758 he published his famous book systema naturae. His greatest contribution to taxonomy was the use of binomial nomenclature for all species of animals and plants


Q3: State two economically important uses of:

(a) Heterotrophic bacteria
(b) Archaebacteria

Answer:
(a) Uses of Heterotrophic bacteria

  • Commercial and Domestic Use: They (Lacto bacillus) help in the production of curd from milk.
  • Decomposers that help in the formation of humus.
  • Medicinal use: Many antibiotics are obtained from some species of bacteria.
  • Nitrogen Cycle: Many soil bacteria help in fixation of atmospheric nitrogen.


(b) Uses of Archaebacteria
  • Live in guts of  ruminant animals such as cows and buffaloes and they produce methane anaerobically (biogas) from the dung of these animals.
  • Methanogens are also involved in the formation of biogas and sewage treatment.



Q4: What is the nature of cell-walls in diatoms?

Answer: The cell wall of diatom is made of silica. It consists of two thin overlapping shells that fit into each other such as a soap box with lids. When the diatoms die, the silica in their cell walls gets deposited in the form of diatomaceous earth. This diatomaceous earth, being gritty, is used in polishing, filtration of oils and syrups.


Q5: Name the algae which is a source of iodine.

Answer: Brown algae called kelps, specially from species of Laminaria.


Sunday 23 October 2016

CBSE Class – XI - Biology - NCERT Chapter 1 - The Living World (NCERT Chapter Solutions)

The Living World

Class – XI - Biology - NCERT Chapter 1 Solutions

CBSE Class – XI - Biology - NCERT Chapter 1 - The Living World (NCERT Chapter Solutions)


Question 1: Why are living organisms classified?

Answer:

Classification helps us understand biodiversity better way. Biodiversity have direct and indirect economic benefits to humans as well as to our ecosystem. Systematic study of such biodiversity is essential to better understand the inter-relationships in our ecosystems. Following are the needs to classify them:

Plants and animals have valuable genetic variation information. It will help us understand the ways evolution take place.

Humans often benefits from plants and animals in different ways. Systematic study will help exploring other potential benefits.

Certain species warn us of imbalances in our ecosystem. e.g. white-rumped vultures became almost extinct because of use of drug brufen (diclofenac) in domestic animals. When vultures ate these dead animals, it led to their kidney failures. Systematic study of the organisms would help in restoring the balance in their ecosystems.

Plants and animals have been the inspiration for technology and engineering design. e.g. SONARS and RADARS work on the same acoustics principles as used by bats. Classification will help us revealing such more inspirations.

It is estimated that the Earth has almost 8.8 million animal, plant, and fungi species, but we’ve only discovered less than a one fourth of this. A large variety of plants, animals, and microbes are found on earth. All these living organisms differ in size, shape, colour, habitat, and many other characteristics. Classification gives a system for identification of known and unknown organisms.


Question 2: Why are the classification systems changing every now and then?

Answer: In the last few hundred million years, plants and animals have undertaken an epic evolutionary journey that has altered the very make-up of the planet. Millions of plants, animals, and microorganisms are found on earth. Many of these have been identified by the scientists. While many new species are still being discovered around the world.

Another reason is that scientists started classifying organisms on the basis of evolutionary relationships rather than solely on the basis of similarities in physical traits.

Therefore, to classify these newly discovered species and finding new basis of classification, new systems of classification have to be devised every now and then. This creates the requirement to change the existing systems of classification.


Question 3: What different criteria would you choose to classify people that you meet often?

Answer: To classify people we often meet, we try to categorise in an ordered fashion.

To begin with we classify them based on gender. It results in the formation of two major groups- boys and girls.

Each of these two groups can be further classified on the basis of the blood relatives, distant relatives, friends, knowns and strangers.

Finally each individual be identified by its name (first name and sir name)


Question 4: What do we learn from identification of individuals and populations?

Answer:
① It helps in studying characteristics of an individual or its entire population.
② It helps in identifying similarities and dissimilarities among the individuals of same kind or between different types of organisms.
③ It helps the scientists find basis to classify organisms in various categories.
④ It helps us finding the relation between the individuals (or its population) with the ecosystem (Biotic and Abiotic factors).