Recent questions tagged cbsc

In Asteraceae and grasses, seeds are formed without fusion of gametes. Mention the scientific term for such a reproduction.

asked Feb 7, 2019 by priyanka.clay6

1 answer

Which characteristic of water pollinated species of pollen grains protect them from water ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

What is a pollen bank ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

What is scutellum ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

What are parthenocarpic fruits ?

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.

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?

asked Feb 7, 2019 by priyanka.clay6

1 answer

How many eggs are present in an embryo sac ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

What is the ploidy of PEN ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

What is the ploidy of the cells in the microspore tetrad ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

Why are pollen grains produced in enormous quality in maize ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

From the above diagram , find out which regions form the bran.

asked Feb 7, 2019 by priyanka.clay6

1 answer

Some plants have a mechanism of shedding of pollen before the maturation of stigma. Why ?

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 ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

What are pollen baskets ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

What is the technique employed to preserve pollen grain for germplasm collection ?

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 ?

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.

asked Feb 7, 2019 by priyanka.clay6

1 answer

Brightly coloured, scented flowers are pollinated by insects. How is it known as technically ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

Can snails pollinate the flowers ? What do you call such a pollination ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

An embryo sac formed directly from a nucellar cell. What is it called ?

asked Feb 7, 2019 by priyanka.clay6

1 answer

Fertilization leads to the formation of embryo. a. Give the technical term for the development of embryo. b. What are the events that occur during embryo development? c. The development of zygote depends on two factors. What are they? d. How will you categorise animals based on the development of zygote inside or outside the female body? e. How does zygote in fungi and algae overcome dessication?

asked Feb 7, 2019 by priyanka.clay6

1 answer

Study the following diagram and answer the questions given below:

asked Feb 7, 2019 by priyanka.clay6

1 answer

Why is vegetative propagation considered as asexual reproduction? Which is better mode: Sexual or asexual? Why?

asked Feb 7, 2019 by priyanka.clay6

1 answer

Distinguish between gametogenesis and embryogenesis.

asked Feb 7, 2019 by priyanka.clay6

1 answer

Complete the flowchart with reference to the reproduction of flower.

asked Feb 7, 2019 by priyanka.clay6

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.

asked Feb 7, 2019 by priyanka.clay6

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?

asked Feb 7, 2019 by priyanka.clay6

1 answer

Give the term for kinds of gametes in the given figures A and B . In the figure A give the specific terms for the gametes.

asked Feb 7, 2019 by priyanka.clay6

1 answer

Give the term for the following figure A,B and C.

asked Feb 7, 2019 by priyanka.clay6

1 answer

What are oviparous and viviparous animals? Give examples.

asked Feb 7, 2019 by priyanka.clay6

1 answer

What is parthenogenesis? Give an example.

asked Feb 7, 2019 by priyanka.clay6

1 answer

Write the sexuality in the following organisms. (a) Earthworm (b) Cockroach (c) Chara (d) Marchantia (e) Sweet Potato (f) Leech.

asked Feb 7, 2019 by priyanka.clay6

1 answer

Explain the features exhibited by the organisms showing external fertilization to Enhance the chances of syngamy .What is the disadvantage of external fertilization ?

asked Feb 6, 2019 by priyanka.clay6

1 answer

Name the asexual reproductive structures of the following: Chlamydomonas, Penicillum, Hydra, Sponge.

asked Feb 6, 2019 by priyanka.clay6

1 answer

Life spans of organisms are not necessarily correlated with their sizes. Explain

asked Feb 6, 2019 by priyanka.clay6

1 answer

How do the following organisms reproduce? Yeast, Amoeba.

asked Feb 6, 2019 by priyanka.clay6

1 answer

Gametes are always haploid .How are the gametes produced from a haploid plant body and a diploid plant body?

asked Feb 6, 2019 by priyanka.clay6

1 answer

Differentiate between asexual and sexual method of reproduction.

asked Feb 6, 2019 by priyanka.clay6

1 answer

What will happen if meiosis does not take place during gametogenesis?

asked Feb 6, 2019 by priyanka.clay6

1 answer

Arrange the following events in proper sequence: a. Embryogenesis b. Fertilization c. Gametogenesis d. Zygote formation.

asked Feb 6, 2019 by priyanka.clay6

1 answer

Can we refer the off-springs formed by asexual reproduction, as a clone? If yes, why?

asked Feb 6, 2019 by priyanka.clay6

1 answer

Why dogs and cats have oestrus cycle but human beings have menstrual cycle, though all are mammals?

asked Feb 6, 2019 by priyanka.clay6

1 answer

Name the process of development of embryo from the zygote. What are the two changes which the zygote undergoes during this process?

asked Feb 6, 2019 by priyanka.clay6

1 answer

Though ginger is found under the soil. Yet it is not a root, but stem. Justify your answer with two reasons. (ii) What are the specialized cells which undergo meiosis in the diploid organisms, called as?

asked Feb 6, 2019 by priyanka.clay6

1 answer

Why can't man be oviparous? Justify the statement.

asked Feb 6, 2019 by priyanka.clay6

1 answer

Label A and B and write the type of the vegetative propagule.

asked Feb 6, 2019 by priyanka.clay6

1 answer

Identify the given plants. How are they different from each other with regard to reproductive organs they possess ?

asked Feb 6, 2019 by priyanka.clay6

1 answer

Sexual reproduction involves fertilization and the formation of embryo. What are the critical events needed for the successful reproduction process?

asked Feb 6, 2019 by priyanka.clay6

1 answer

Categorise the following plants based on the floral characteristics: Hibiscus, Cucumber, Papaya, Guava.

asked Feb 6, 2019 by priyanka.clay6

1 answer

Ask Questions, Get Answers