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प्रश्न
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.
विकल्प
(i) and (iv)
(ii) and (iii)
(i) and (iii)
(ii) and (iv)
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उत्तर
(ii) and (iv)
Explanation:
Plants have sexual reproductive organs such as stamen and pistil. Fruit is formed after fertilization in plants.
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संबंधित प्रश्न
State significance of pollination.
Fill in the following blank with suitable word :
The.......... at the base of the carpel contains egg cells.
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?
Name the part of a seed which grows into root.
Name the part of a seed which grows into shoot.
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?
What is a flower ? Draw a neat labelled diagram showing the L.S. of a typical flower.
A student is asked to study the different parts of an embryo of pea seeds. Given below are the essential steps for the experiment :
(I) Soak the pea seeds in plain water and keep them overnight.
(II) Cut open the soaked seed and observe its different parts.
(III) Take some pea seeds in a petri dish.
(IV) 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) III, I, IV, II
(B) III, IV, I, II
(C) III, I, II, IV
(D) III, II, I, IV
Sketch the labeled diagram:
Flower with its sexual reproductive organs
What is cleistogamy? Write one advantage and one disadvantage of it, to the plant.
Find the odd one out:
Find an odd one out.
Match the following
| 1. | Petal | Opuntia |
| 2. | Fern | Chrysanthemum |
| 3. | Phylloclade | Attracts insect |
| 4. | Hooks | Spore |
| 5. | Sucker | Bignonia |
In which part of the flower germination of pollen grains takes place?
Where does the endothecium layer of anther lobes is present?
Which of the following are the chemical components of the wall of pollen tube?
Complete the table
| Carly x | ______ | ______ |
| ______ | petal | attract insects |
| Androecium | ______ | Male reproductive part |
| ______ | ______ | Female reproductive part. |
Which among the following statements are true for sexual reproduction in flowering plants?
- It requires two types of gametes
- Fertilisation is a compulsory event
- It always results in formation of zygote
- Offspring formed are clones
