Advertisements
Advertisements
Question
Give any two examples of agents of pollination.
Advertisements
Solution
Examples of agents of pollination are:
- Insect pollination: Bees are the most common and recognized insect pollinators.
- Bird pollination: Plants are pollinated by some birds, particularly hummingbirds.
APPEARS IN
RELATED QUESTIONS
Name the parts A, B and C shown in the diagram and write their functions.
Name the parts labelled as A, B, C and D in the diagram given below:
"The chromosomal number of the sexually producing parents and their offspring is the same." Justify this statement.
How is the process of pollination different from fertilization?
Where are the pollen grains produced?
Fill in the following blank with suitable word :
The name of the structure in the flower in which the male gamete is formed is...........
What is made in anther of a flower?
Explain the term 'fertilisation'.
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 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)
The correct sequence of reproductive stages occurring in flowering plants is ______
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?
In what ways is fertilisation in a plant similar to fertilisation in a human?
Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.
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.
Draw a diagram of a pistil showing pollen tube growth into the ovule and label the following:
Pollen grain, male gamete, female gamete, ovary.
Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing process of germination of pollen grains on stigma and label the following parts:
(a) Female germ cell
(b) Male germ cell
(c) Ovary
Explain sexual reproduction in plants.
A student is observing the temporary mount of a leaf peel under a microscope. Draw a labelled diagram of the structure of stomata as seen under the microscope
Find the odd one out:
Pollen grains are formed by _________ division in locules of anthers.
Calyx : Sepals : : Corolla : ________________
Pollen grains from anther are transferred to the stigma.
Write the functions of sepals
Explain the sexual reproduction process in plants with a diagram.
The essential parts of a flower are ______.
Where does the endothecium layer of anther lobes is present?
Which of the following are the chemical components of the wall of pollen tube?
Antipodal cells are present towards the ______ in an anatropous ovule.
The 3-celled egg apparatus at the micropylar end comprises of ______
Sperm and egg nuclei fuse due to ______.
Flowers showing ornithophily show few characteristic like ______.
The seed that contains the future plant is called the ______
Double fertilization means ______.
What is puberty?
Type of sexual reproduction is ______.
Explain the post fertilization changes that occur in the ovary of a flower.
