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प्रश्न
What are the agents for pollination?
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उत्तर
Pollination occurs with the help of abiotic agents (wind, water) and biotic agents (insects and other animals).
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संबंधित प्रश्न
Match the following:
| Column A | Column B |
| (i) Stigma | (a) Neuron |
| (ii) Pepsin | (b) Carpel |
| (iii) Dendrites | (c) Protein |
| (d) Stamen |
What is pollination?
Name the parts A, B and C shown in the following diagram and state one function of each.
A student identified the various parts of an embryo of a gram seed and listed them as given below :
(I) Testa
(II) Plumule
(III) Radicle
(IV) Cotyledon
(V) Tegmen
Out of these the actual parts of the embryo are :
(A) I, II, III
(B) II, III, IV
(C) III, IV, V
(D) II, IV, V
Mention the changes a flower undergoes after fertilisation.
Write the names of those parts of a flower which serve the same function as the following do in the animals :
(i) testis,
(ii) sperm,
(iii) ovary,
(iv) egg
The fusion of male and female gametes is termed as ______.
Name the male part of the flower.
What are the reproductive organs in a flower?
Where is the male gamete formed in flowering plants?
Fill in the following blank with suitable word :
Ovules contain ......... gametes of a plant.
Fill in the following blank with suitable word :
The.......... at the base of the carpel contains egg cells.
What type of plants reproduce by sexual reproduction method?
Describe the process of fertilisation in a flower with the help of labelled diagrams.
Put a tick mark (✓) against the correct alternative in the following statement
Pollen is produced in the:
Mention the function of Stigma.
(a) Identify A, B and C in the given diagram and write their functions.
(b) Mention the role of gamete and zygote in sexually reproducing organisms.
“Cell division is a type of reproduction in unicellular organism.” Justify.
Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma.
Write the names of male and female reproductive parts of a flower.
What is phototropism?
Identify the odd. Stigma, Style, Pollen, Ovary.
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
Differentiate between self-pollination and cross-pollination.
What is cleistogamy? Write one advantage and one disadvantage of it, to the plant.
Calyx : Sepals : : Corolla : ________________
The male reproductive part of a flower is ______.
In which part of the flower germination of pollen grains takes place?
Antipodal cells are present towards the ______ in an anatropous ovule.
Generally, in a pollen tube, which of the following moves to the tip of the tube?
How many middle layers are generally present in the wall of the anther lobes?
In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.
Is the chromosome number of zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?
Trace the path a male gamete takes to fertilise a female gamete after being released from the penis.
Double fertilization is essential for formation of ______.
Sexual maturation of reproductive tissues and organs are necessary link for reproduction. Elucidate.
Given below is a diagram of a germinating seed. Label the parts that:
- gives rise to future shoot.
- gives rise to future root system.
- stores food.
In male reproductive whorl of a flower the archesporial cells are formed by ______.
The number of pollen sacs in a dithecous anther is ______.
