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प्रश्न
Write the functions of sepals
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उत्तर
Sepals are responsible for the protection of inner whorls.
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संबंधित प्रश्न
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
Mature ovary forms the ______.
Name the swollen lower part of the carpel.
Fill in the following blank with suitable word :
Pollen grains contain ............ gametes of a plant.
Fill in the following blank with suitable word :
Ovules contain ......... gametes of a plant.
Fill in the following blank with suitable word :
Flowering plants reproduce by ...........method of reproduction.
Draw a neat sketch of the carpel of a flower. Mark in it stigma, style and ovary.
What is made in ovary of a flower?
What type of plants reproduce by sexual reproduction method?
The flask-shaped organ A at the centre of a flower is surrounded by a number of little stalks B having swollen tops which lie just inside the ring of petals.
(a) Name A. What are the various parts of A?
(b) Which part of A contains gametes?
(c) Name B. What is the swollen top of B known as?
(d) What does the swollen top of b contain?
(e) Out of A and B, which one is (i) male part, and (ii) female part of the flower?
Fill in the blank by selecting suitable word:
A flower bearing only male or female parts is known as __________ flower.
Multiple choice question. Tick (✓) the correct choice:
Unisexual flowers are found in
- mulberry
- mustard
- pea
- sunflower
Multiple choice question. Tick (✓) the correct choice:
The male gamete is present inside the which germinates.
- the style
- the stigma
- the anther
- the ovary
State whether the following statement is true (T) or false (F):
Stamens make egg cells.
Find the odd-one out, giving reason:
Anther, pollen grain, ovule male gamete
Draw a labelled diagram of a bisexual flower.
Draw a diagram of the longitudinal section of a flower exhibiting germination of pollen on stigma and label (i) ovary, (ii) male germ-cell, (iii) female germ-cell and (iv) ovule on it.
Identify A, B, C and D in the given diagram and write their names.
Draw a diagram of the longitudinal section of a flower and label on it sepal, petal, ovary and stigma.
Differentiate between self-pollination and cross-pollination.
Find the odd one out:
Draw a neat and labelled diagram.
Double fertilization in angiosperms
Explain the sexual reproduction process in plants with a diagram.
Write the events involved in the sexual reproduction of a flowering plant.
a. Discuss the first event and write the types.
b. Mention the advantages and the disadvantages of that event.
Generally, in a pollen tube, which of the following moves to the tip of the tube?
Which type of development is observed in male gametophytes of plants?
The seed that contains the future plant is called the ______
Variations occur as a result of ______
Length of pollen tube depends on the distance between ______
In a bisexual flower inspite of the young stamens being removed artificially, the flower produces fruit. Provide a suitable explanation for the above situation.
Give reason for the following:
Fertilization cannot take place in flowers if pollination does not occur.
Double fertilization is exhibited by ______
Give any two examples of agents of pollination.
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.
The number of pollen sacs in a dithecous anther is ______.
