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Recent questions tagged sec-d
Questions
Study the diagram and answer questions that follows:
cbsc
class 12
biology
human reproduction
sec-d
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Study the following diagram and answer the following questions :
cbsc
class 12
biology
human reproduction
sec-d
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
Your classmate complains of headache and cough to the doctor. The doctor confirms that he is suffering from pneumonia and not just common cold. How did the doctor reach such a conclusion? Mention any two precautions to be followed to prevent the spread of this disease.
cbsc
class 12
biology
human health and diseases
sec-d
asked
Apr 16, 2019
by
priyanka.clay6
1
answer
a.Name the primates that lived about 15 million years ago. List their characteristic features. <br> b. Where was the first man-like animal found? <br> c. Write the order in which Neanderthals, **** habilis and **** erectus appeared on the earth. State the brain capacity of each one of them. <br> d. When did modern **** sapiens appear on this planet?
cbsc
class 12
biology
evolution
sec-d
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
How does Hardy-Weinberg equation explain genetic equilibrium ? <br> Describe how this equilibrium gets disturbed which may lead to founder effect.
cbsc
class 12
biology
evolution
sec-d
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Explain taking one example of vertebrate anatomy that evolution of life has occurred on earth. <br> 'Nature selects for fitness'. Explain with suitable example.
cbsc
class 12
biology
evolution
sec-d
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
List the various causes of variations in the progeny of a population. Describe the three different ways in which natural selection operates in nature, with regard to organic evolution.
cbsc
class 12
biology
evolution
sec-d
asked
Apr 14, 2019
by
priyanka.clay6
1
answer
Explain eutrophication.
cbsc
class 12
biology
environmental issues
sec-d
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Write a note on sources of noise pollution and effect of noise pollution.
cbsc
class 12
biology
environmental issues
sec-d
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Observe the following figure carefully and answer the questions that follow
cbsc
class 12
biology
environmental issues
sec-d
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
a)Why are catalytic convertors recommended for vehicles ? <br> b)Why should such vehicles use only unleaded petrol. <br> c)Why is CNG preferred to diesel as a fuel in vehicles.
cbsc
class 12
biology
environmental issues
sec-d
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
What is hydrarch?
cbsc
class 12
biology
ecosystem
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is xeroarch?
cbsc
class 12
biology
ecosystem
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Give an account of energy flow in an ecosystem.
cbsc
class 12
biology
ecosystem
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Describe the major components of ecosystems.
cbsc
class 12
biology
ecosystem
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Explain how recombinants and non- recombinants are differentiated on the basis of colour production in the presence of a chremogenic substrate. Name that procedure. Describe the temperature treatment (-3 step-) that enhances the bacteria to take up the rDNA.
cbsc
class 12
biology
biotechnology : principles and process
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What do you mean by PCR? Briefly enumerate the major steps of PCR. Mention the utility of PCR.
cbsc
class 12
biology
biotechnology : principles and process
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are transgenic animals? Explain any four ways in which such animals can be beneficial to humans.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
What is ADA deficiency? Describe three methods to cure it.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
One of the main objectives of biotechnology is to minimise the use of insecticides on cultivated crops. Explain with the help of a suitable example, how insect-resistant crops have been developed using techniques of biotechnology.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Name the process involved in the production of nematode-resistant tobacco plants, using genetic engineering. Explain the strategy adopted to adopted to develop such plants.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
GMO’s have been useful to mankind. List about five useful GMO’s created so far and how they have been useful.
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Explain the steps involved in the production of genetically engineered insulin?
cbsc
class 12
biology
biodiversity and its applications
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Isah Upanishad says ‘let no one species encroach over the rights and privileges of other species. <br> One can enjoy nature by giving up greed’. But human activities have accelerated the rate of extinction of species in recent times. <br> (a) Name any four such mass activities. <br> (b) Describe how each of these activities leads to loss of biodiversity. <br> ( c) What value is taught by the Upanishad?
cbsc
class 12
biology
biodiversity and conservation
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
a) Taking one example each of habitat loss and fragmentation, explain how the two are responsible for biodiversity loss. <br> b) Explain two different ways of biodiversity conservation.
cbsc
class 12
biology
biodiversity and conservation
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
What are the two types of desirable approaches to conserve biodiversity? State the differences between the two
cbsc
class 12
biology
biodiversity and conservation
sec-d
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Explain the following terms : False fruit ,True fruit, Parthenocarpic fruit, Apomixis, Polyembryony,.
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
Explain the following terms : Non-albuminous, Albuminous, Perisperm, Pericarp, seed dormancy.
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
Describe the development of male gametophyte in angiosperms.
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
Trace the development of a mature female gametophyte from a megaspore mother cell.
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
Explain the pollen pistil interaction with a sketch showing entry of pollen tube into a synergid.
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
What are the characteristics of wind ,water and insect pollinated flowers ?
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
Continued self-pollination result in inbreeding depression.What are the out breeding devices developed in flowering plants to discourage self-pollination? Which type of pollination seen in Papaya ?
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
Draw an embryo sac of flowering plants and label the parts: <br> a. Which guides the entry of the pollen tube? <br> b. Which develops into endosperm <br> c. Which develops with male gamete to form the zygote? <br> d. What will be the fate of antipodal cells after fertilization? <br> e. Name the cell that develops into an embryo sac. <br> f. How many embryo sacs are formed from one megaspore mother cell. <br>
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
Draw a well-labelled diagram of the L.S of embryo of grasses. How does it differ from that of bean.
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
Represent diagrammatically the formation of an embryo sac from a megaspore mother cell.
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
“Dehydration of seed increases their shelf life” – Explain <br> Cleistogamous flowers are strictly self pollinating,” Explain. What is the disadvantage of this phenomenon?
cbsc
class12
biology
sexual reproduction in plants
sec-d
asked
Feb 11, 2019
by
priyanka.clay6
1
answer
Fertilization leads to the formation of embryo. <br> a. Give the technical term for the development of embryo. <br> b. What are the events that occur during embryo development? <br> c. The development of zygote depends on two factors. What are they? <br> d. How will you categorise animals based on the development of zygote inside or outside the female body? <br> e. How does zygote in fungi and algae overcome dessication?
cbsc
class12
biology
reproduction in organism
sec-d
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Study the following diagram and answer the questions given below:
cbsc
class12
biology
reproduction in organism
sec-d
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
In a co educational school, the students of higher classes are often confused and uncomfortable with the development changes that their bodies undergo. Seeing this, the Biology teacher decided to conduct a seminar on the *** education. Other teachers objected this saying it is totally unnecessary. a)What value system does the teacher show?b) What kind of change do adolescent children undergo?c.)Is *** education advisable in schools?
biologycbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 28, 2016
by
meena.p
1
answer
Mrs Kavitha was eager to know the *** of the foetus that her daughter-in-law was carrying. She was so anxious that she was ready to pay any amount for it. The doctor refused to disclose the test result. a.What is the value exhibited by the doctor? b. How can we know the *** of the foetus? How is it done? c. Why is disclosing the *** of the foetus banned in our country?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 27, 2016
by
meena.p
1
answer
Anitha was very happy when she gave birth to her first child. Her in laws were dissatisfied at her for not giving birth to a male child and blamed Anitha. Anitha tried to convince her in laws that she had no role in the child’s gender. They understood the biological reason, yet were not satisfied. Anitha’s husband took up the matter and convinced his parents. a. What values did Anitha’s husband show in the above situation? b.What governs *** determination in humans? How is it different from birds? c.Why cannot Anitha be blamed for not giving birth to a male child?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 23, 2016
by
meena.p
1
answer
Rita and her parents were watching a TV serial in the evening. During a commercial break, an advertisement flashed on the screen that was promoting use of sanitary napkins. Rita was still watching the TV. The parents got embarrassed and changed the channel. Rita objected to her parents behavior and explained the need of these advertisements. a.What values did parents show? b.Briefly describe the phases of menstrual cycle c. Do you think such advertisements should be avoided or banned? Why?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 21, 2016
by
meena.p
1
answer
Some parents wrote a complaint letter to the local municipality to remove all the hoardings in the city advertising the use of condoms and matters related to AIDS prevention. The children of these parents came to know about the matter and raised their voice against removal of hoardings. The parents were convinced by the awareness level of their children and withdrew their complaint a)Parents considered the hoardings as sight pollution. Why do you disagree? b)What value is promoted by the children protesting against their parents? c)What are the methods through which AIDS spread?
cbse
class12
biology
zoology
sec-d
value-based-question
asked
Dec 20, 2016
by
meena.p
1
answer
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