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Recent questions tagged sexual reproduction in plants
Questions
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
by
priyanka.clay6
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
by
priyanka.clay6
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
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
Embryosac of some apomictic species appear normal but come from diploid cells. Suggest a suitable ex
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-e
sexual reproduction in plants
asked
Jun 14, 2017
by
pady_1
1
answer
Embryosac of some apomictic species appear normal but come from diploid cells. Suggest a suitable ex
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-e
sexual reproduction in plants
asked
Jun 14, 2017
by
pady_1
1
answer
Embryosac of some apomictic species appear normal but come from diploid cells. Suggest a suitable ex
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-e
sexual reproduction in plants
asked
Jun 14, 2017
by
pady_1
1
answer
What are the possible types of pollinations in chasmogamous flowers. Give reasons.
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-c
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
The generative cell of two - celled pollen divides in the pollen tube but not in a three celled poll
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Why does the zygote begin to divide only after the division of Primary Endosperm Cell?
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Are parthenocarpy and apomixes different phenomenon? Discuss their benefits.
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-c
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Does self incompatibility impose any restrictions on autogamy? Give reasons and suggest method of po
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Does self incompatibility impose any restrictions on autogamy? Give reasons and suggest method of po
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Vivipary automatically limits the number of offsprings in a litter. How?
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-c
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Given below are the events that are observed in an artificial hybridization programme. Arrange them
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-c
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
<div>What is the function of two male gametes produced by each pollen grain in angiosperms?</div>
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
How is pollination carried out in water plants?
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 13, 2017
by
pady_1
1
answer
Which is a triploid tissue in a fertilized ovule? How is triploid condition achieved?
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-b
sexual reproduction in plants
asked
Jun 12, 2017
by
pady_1
1
answer
Name the type of pollination in self incompatible plants.
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-a
sexual reproduction in plants
asked
Jun 12, 2017
by
pady_1
1
answer
What is self incompatibility?
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-a
sexual reproduction in plants
asked
Jun 12, 2017
by
pady_1
1
answer
Can an unfertilized egg, apomictic embryosac give rise to diploid embryo? If yes, then how?
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-a
sexual reproduction in plants
asked
Jun 12, 2017
by
pady_1
1
answer
In case of polyembryony, if an embryo develops from synergid and another from the nucellus which is
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-a
sexual reproduction in plants
asked
Jun 12, 2017
by
pady_1
1
answer
Name the part of the pistil which develop into fruits and seeds.
cbse
class12
ch2
exemplar
theoryquestion
biology
sec-a
sexual reproduction in plants
asked
Jun 12, 2017
by
pady_1
1
answer
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