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Questions
What is pollination?
What is meant by pollination?
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Solution
Pollination is the transfer of pollen grains from the male part of a flower, the anther, to the female part, the stigma. This process is crucial for fertilization, leading to the development of seeds and fruits and ensuring the plant species survival.
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RELATED QUESTIONS
Name the parts labelled as A, B, C and D in the diagram given below:-
(i) Name the part marked 'A' in the diagram.
(ii) How dose 'A' reachese part 'B'?
(iii) State the importance of the part 'C'.
(iv) What happens to the part marked 'D' after fertilisation is over?
A student has to perform the experiment "To identify the different parts of an embryo of a dicot seed." Select from the following an appropriate group of seeds:
(a) Pea, gram, wheat
(b) Red kidney bean, maize, gram
(c) Maize, wheat, red kidney bean
(d) Red kidney bean, pea, gram
Give one example of a unisexual flower.
You are asked by your teacher to study the different parts of an embryo of a gram seed. Given below are the steps to be followed for the experiment:
I. Soak the gram seeds in plain water and keep them overnight.
II. Cut open a soaked seed and observe its different parts.
III. Take some dry gram seeds in a petri dish.
IV. Drain the excess water.
V. Cover the soaked seeds with a wet cotton cloth and leave them for a day.
The correct sequence of these steps is :
(A) III, I, V, IV, II
(B) III, I, II, IV, V
(C) III, IV, V, I, II
(D) III, I, IV, V, II
Mature ovary forms the ______.
Where are the pollen grains produced?
What is the name of female organ of a flower (other than carpel)?
Where is the male gamete formed in flowering plants?
Where is the female gamete formed in flowering plants?
Fill in the following blank with suitable word :
The ovary of a flower becomes ....... after fertilisation.
Draw a neat sketch of the stamen of a flower. Mark in it filament and anther.
Explain the terms 'self pollination'
How is the process of pollination different from fertilization?
Describe the process of fertilisation in a flower with the help of labelled diagrams.
(a) Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel.
(b) What name is given to (i) all the petals of a flower, and (ii) all the sepals of a flower?
(c) What are (i) stamen, and (ii) carpel, in a flower?
(d) What is the other name of carpel of a flower?
(e) What is the name of yellow powdery substance present in the anther of a flower?
Which of the following is the correct sequence of events of sexual reproduction in a flower?
(a) pollination, fertilisation, seed, embryo
(b) seed, embryo, fertilisation, pollination
(c) pollination, fertilisation, embryo, seed
(d) embryo, seed, pollination, fertilisation
Which of the following statements are true for flowers?
(i) Flowers are always bisexual.
(ii) They contain sexual reproductive organs.
(iii) They are produced in all groups of plants.
(iv) after fertilization they give rise to fruits.
Which among the following statements are true for unisexual flowers?
(i) They possess both stamen and pistil
(ii) They possess either stamen or pistil
(iii) They exhibit cross pollination
(iv) Unisexual flower possessing only stamens cannot produce fruits
(a) (i) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (i), (iii) and (iv)
Multiple choice question. Tick (✓) the correct choice:
Unisexual flowers are found in
- mulberry
- mustard
- pea
- sunflower
Fill in the blanks:
A carpel consists of ________ , ________ and ________.
Fill in the blanks:
A stamen consists of ______ and ________.
State whether the following statement is true (T) or false (F):
Flowers which possess stamens and carpel are called unisexual.
What part is played by stamens and carpels in reproduction?
(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.
In the figure, the parts marked A, B and C are sequentially:
(A) Plumule, Radicle and Cotyledon
(B) Radicle, Plumule and Cotyledon
(C) Plumule, Cotyledon and Radicle
(D) Radicle, Cotyledon and Plumule
Identify the odd. Stigma, Style, Pollen, Ovary.
Fill in the blanks and rewrite the completed statements:
Lymph flows in _______________ direction.
Answer the following question.
How does suitable pollination lead to fertilization?
What is meant by pollination?
Answer the following question.
List two agents of pollination?
Find the odd one out:
Pollen grains are formed by _________ division in locules of anthers.
Define.
Inflorescence
What does germination mean?
Give scientific reason.
Flower is a structural unit of sexual reproduction in plants.
Observe the figure below. Write functions of the labelled parts.
In which part of the flower germination of pollen grains takes place?
Which of the following are the chemical components of the wall of pollen tube?
How many middle layers are generally present in the wall of the anther lobes?
State the number of sets of chromosomes present in a zygote.
Double fertilization is exhibited by ______
Sketch and label the essential and accessory whorls of flower.
What is the function of calyx?
The figure below shows the concept of double fertilization. Complete the flow chart showing the progress at each step:
In flowering plants, the pollen grains are transferred to stigma by pollination but the female germ cells are present in the ovary.
Explain with the help of a labelled diagram (only concerned parts), how the male germ cell reaches the ovary.
State the post-fertilisation changes that lead to fruit formation in plants.
