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Question
What is the structural unit of sexual reproduction in plant?
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Solution
Flower is the structural unit of the sexual reproduction in plant.
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RELATED QUESTIONS
How does fertilisation occur in flowers? Name the parts of the flower that develop into (i) seed, and (ii) fruit after fertilisation.
(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 while observing an embryo of a pea seed in the laboratory listed various parts of the embryo as given below:
Testa, Tegmen, Radicle, Plumule, Micropyle, Cotyledon.
On examining the list the teacher remarked that only three parts are correct. Select three correct parts from the above list:
(a) Testa, Radicle, Cotyleddon
(b) Tegmen, Radicle, Micropyle
(c) Cotyledon, Plumule, Testa
(d) Radicle, Cotyledon, Plumule
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
A flower may have either male or female reproductive parts. Such a flower is called ______.
What are the reproductive organs in a flower?
Where is the male gamete formed in flowering plants?
What is made in anther of a flower?
Explain the terms 'self pollination'
Name the part of a seed which contains stored food.
In tobacco plant, the male gametes have 24 chromosomes.
What is the number of chromosomes in the zygote?
What is meant by 'unisexual flowers' and 'bisexual flowers'? Give two examples of each.
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?
When an insect sits on the flower of a plant then some particles A present in the top of little stalks in the flower attach to its body hair. When this insect now sits on the flower of another similar plant, then particles A attached to the hair of insect are put on the top of a flask-shaped organ at the centre of flower. The particle A grows a long tube b from the top of flask-shaped organ through which C moves down and reaches the bottom part of flask-shaped organ. Here C fuses with the nucleus of d contained in structure E. the fusion of C and D forms a new cell f which grows and develops into a seed of the plant.
(a) What are particles A? What is the process of transferring A from one flower to another flower of similar plant by the insect known as?
(b) What is the name of tube B?
(c) What is C which moves down through the tube B?
(d) Name D and E.
(e) What is F?
In a bisexual flower, inspite of the young stamens being removed artificially, the flower produces fruit. Explain.
Multiple choice question. Tick (✓) the correct choice:
Unisexual flowers are found in
- mulberry
- mustard
- pea
- sunflower
Mention the function of Stigma.
The students of a class were asked by the teacher to study the different parts of an embryo of an angiosperm. Given below are the essential steps for the experiment :
A. Soak the seeds in plain water and keep them overnight.
B. Cut open the soaked seed and observe its different parts.
C. Take some healthy seeds in a petri-dish.
D. Drain the excess water, cover the seeds with a wet cotton cloth and leave them as it is for a day.
The correct sequence of these steps is
(a) C, A, D, B
(b) C, D, A, B
(c) A, C, D, B
(d) A, C, B, D
Explain the process of fertilisation in flowers.
“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.
What is phototropism?
List any two differences between pollination and fertilization.
Sketch the labeled diagram:
Flower with its sexual reproductive organs
Fill in the blank by selecting suitable word:
Transfer of pollen grains from the anther to the stigma is known as______________.
What is cleistogamy? Write one advantage and one disadvantage of it, to the plant.
What does germination mean?
Give scientific reason.
Fertilization in plants is called double fertilization.
Draw a neat and labelled diagram.
Double fertilization in angiosperms
The ovule of an angiosperm is technically equivalent to ______
The 3-celled egg apparatus at the micropylar end comprises of ______
What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its roots tip cells?
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?
Give any two examples of agents of pollination.
What are the agents for pollination?
Triple fusion involves ______.
Sexual maturation of reproductive tissues and organs are necessary link for reproduction. Elucidate.
- Assertion: Primary endosperm nucleus is diploid.
- Reason: It is the product of double fertilisation.
