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Questions asked by priyanka.clay6
Questions
1352
questions
0
answers selected
What are the stages of embryogeny in a Dicotyledonous embryo ?
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
How does geitonogamy differ from xenogamy in plants ?
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
Why is the process of fertilization in flowering plant referred to as double fertilization ? Explain.
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
How many haploid nuclei and haploid cells are present in the female gametophyte of angiosperm ?
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
What are the effects of pollen in some people and how are the pollen grains are being used as food supplements ?
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
How could pollen grains be well preserved as fossils ?
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
Of the eight nuclei of the embryo sac in flowering plants three are at the micropylar end. <br> How many are there at the chalazal end and how many nuclei located in the central cell ?
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
Identify the given figure and label the parts.
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
In what ways does the study of pollination enrich our understanding of Biology and enable us to apply it for increasing crop productivity ?
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
If a certain plant when introduced into a new environment neither produces seeds nor does it respond to vegetative propagation. Hoe can more plants be produced ?
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
Observe the following diagram and answer the questions given at the end
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
How would you explain seed set in papaya in the absence of male plant in close vicinity of a female plant ?
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 8, 2019
1
answer
Give reason : <br> a. Angiosperms show the process of double fertilization. <br> b. Flowers in Salvia plants show stamens with lever mechanisms.
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 7, 2019
1
answer
Note the relationship between the first two words and suggest a suitable word for the fourth place. <br> a. Euphorbia : Cyathium : Ocimum : ___________ <br> b. Mango : Eucarp : Apple : ____________
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 7, 2019
1
answer
"Incompatibility is a natural barrier in the fusion of gametes". Justify the statement.
cbsc
class12
biology
sexual reproduction in plants
sec-b
asked
Feb 7, 2019
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
1
answer
Complete the flow chart.
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
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
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
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
1
answer
Do pollen grains survive in adverse conditions ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
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
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
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
1
answer
What is a pollen bank ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
1
answer
What is scutellum ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
1
answer
What are parthenocarpic fruits ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
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
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
1
answer
How many eggs are present in an embryo sac ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
1
answer
What is the ploidy of PEN ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
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
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
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
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
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
1
answer
What are pollen baskets ?
cbsc
class12
biology
sexual reproduction in plants
sec-a
asked
Feb 7, 2019
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
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
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
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
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
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
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
1
answer
Study the following diagram and answer the questions given below:
cbsc
class12
biology
reproduction in organism
sec-d
asked
Feb 7, 2019
1
answer
Why is vegetative propagation considered as asexual reproduction? Which is better mode: Sexual or asexual? Why?
cbsc
class12
biology
reproduction in organism
sec-c
asked
Feb 7, 2019
1
answer
Distinguish between gametogenesis and embryogenesis.
cbsc
class12
biology
reproduction in organism
sec-c
asked
Feb 7, 2019
1
answer
Complete the flowchart with reference to the reproduction of flower.
cbsc
class12
biology
reproduction in organism
sec-c
asked
Feb 7, 2019
1
answer
Can we consider simple cell division as a method of reproduction? What will you call this kind of reproduction? Give two examples in support of your answer.
cbsc
class12
biology
reproduction in organism
sec-c
asked
Feb 7, 2019
1
answer
In a pond ecosystem you may find the plant with purple flowers that spread very fast to cover the entire pond within a short span of time. How does it spread? How does it harm the aquatic body?
cbsc
class12
biology
reproduction in organism
sec-c
asked
Feb 7, 2019
1
answer
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