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Recent questions tagged sec-a
Questions
Why do we use GM to create tailor made plants?
cbsc
class 12
biology
biodiversity and its applications
sec-a
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
A species of Solanum is intolerant to salty soil. How will you make the species tolerant to the given abiotic stress?
cbsc
class 12
biology
biodiversity and its applications
sec-a
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
"The Green Revolution has been achieved due to the use of improved crop varieties and agro chemicals, but it is still not enough to feed the growing population". Suggest a suitable method of agriculture to meet the demand.
cbsc
class 12
biology
biodiversity and its applications
sec-a
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
The insulin produced by using recombinant DNA technology is more advantageous than the insulin extracted from the pancreas of slaughtered pigs. How?
cbsc
class 12
biology
biodiversity and its applications
sec-a
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
The first transgenic cow,produced human protein enriched milk. Name the cow and protein found in the milk.
cbsc
class 12
biology
biodiversity and its applications
sec-a
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Name the technique based on the principles of antigen-antibody interaction used in the detection of virus.
cbsc
class 12
biology
biodiversity and its applications
sec-a
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Which recombinant vaccine is currently used in vaccination programme?
cbsc
class 12
biology
biodiversity and its applications
sec-a
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Why is genetic variation important in the plant Rauwolfia vomitoria?
cbsc
class 12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
What is the expanded for of IUCN?
cbsc
class 12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
About 20 species of a Cichlid fish became extinct when a particular fish was introduced in Lake Victoria of Africa. Name the invasive fish.
cbsc
class 12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
The amazon rain forest is referred to as ‘the lungs of the planet’. Mention any one human activity which causes loss of biodiversity in this region.
cbsc
class 12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
Write the importance of cryopreservation in conservation of biodiversity
cbsc
class 12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
Why is India said to have greater ecosystem than Norway?
cbsc
class 12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
Mention one application of pollen bank. How are pollen stored in the bank?
cbsc
class 12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
Name the unlabelled areas 'a' and 'b' of the pie chart representing the global biodiversity of invertebrates showing their proportionate number of species of major taxa. <br>
cbsc
class 12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
Why is tropical environment able to support greater species diversity?
cbsc
class 12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
What trend is observed in respect of species diversity when we move from equator to poles?
cbsc
class12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
a) India has more than 50000 different strains of rice and 1000 varieties of mangoes. <br> b) Western Ghats have a greater Amphibian diversity than the Eastern Ghats.What do you infer from the above two statements?
cbsc
class12
biology
biodiversity and conservation
sec-a
asked
Apr 8, 2019
by
priyanka.clay6
1
answer
If the number of chromosomes in the leaf cell of a flowering plant is 28. What number would you expect in the embryo and endosperm ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Complete the flow chart.
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Identify the figure given below and label the parts indicated in the figure.
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
T.S of anther shows four layers in the wall-epidermis, endothelium, tapetum and middle layer. Arrange them from outermost to innermost.
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Non-albuminous seeds do not have endosperm, then from where do they take the food during germination ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Do pollen grains survive in adverse conditions ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
If the diploid number of chromosomes in 16 in an organism, mention the number of chromosomes in antipodals and endosperm.
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
In Asteraceae and grasses, seeds are formed without fusion of gametes. Mention the scientific term for such a reproduction.
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Which characteristic of water pollinated species of pollen grains protect them from water ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
What is a pollen bank ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
What is scutellum ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
What are parthenocarpic fruits ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
The following diagram depicts a stage in the development of a spindle produces two cells. Name the cells.
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Even though each pollen grain has two male gametes, why are atleast 10 pollen grains and not 5 pollen grains required to fertilize 10 ovules present in a particular carpel?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
How many eggs are present in an embryo sac ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
What is the ploidy of PEN ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
What is the ploidy of the cells in the microspore tetrad ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Why are pollen grains produced in enormous quality in maize ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
From the above diagram , find out which regions form the bran.
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Some plants have a mechanism of shedding of pollen before the maturation of stigma. Why ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
All the aquatic plants cannot use water for pollination. Do you agree with this statement ? Why ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
What are pollen baskets ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
What is the technique employed to preserve pollen grain for germplasm collection ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
The most biologically resistant material is seen in plants. Where do you see it in plants ? What is it called ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Study the following diagram and answer the question given at the end. The anther dehisces in the line of dehiscence. State any two methods of dehiscence of anther.
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Brightly coloured, scented flowers are pollinated by insects. How is it known as technically ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
Can snails pollinate the flowers ? What do you call such a pollination ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
An embryo sac formed directly from a nucellar cell. What is it called ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
by
priyanka.clay6
1
answer
In seed plants how are the non-motile gametes carried to female gamete?
cbsc
class12
biology
reproduction in organism
sec-a
asked
Feb 5, 2019
by
priyanka.clay6
1
answer
Name the plant which flower only once in their life time.
cbsc
class12
biology
reproduction in organism
sec-a
asked
Feb 5, 2019
by
priyanka.clay6
1
answer
Name the type of plants that show clear cut vegetative, reproductive and senescent phases.
cbsc
class12
biology
reproduction in organism
sec-a
asked
Feb 5, 2019
by
priyanka.clay6
1
answer
What is a vegetative phase in plants?
cbsc
class12
biology
reproduction in organism
sec-a
asked
Feb 5, 2019
by
priyanka.clay6
1
answer
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