Advertisements
Advertisements
प्रश्न
Why do moss plants produce very large number of male gametes? Provide one reason. What are these gametes called?
Advertisements
उत्तर १
Moss plants produce a large number of male gametes to increase the chances of fertilisation, as the eggs are located in the archegonium and the male gametes have to swim in water to reach the eggs for fertilisation to occur. The male gametes are called antherozoids.
उत्तर २
Moss plants produce a very large number of male gametes because the male gametes need to move through a moist environment to reach the egg for fertilization. Many male gametes fail to reach the egg, so producing them in large numbers compensates for this loss. These male gametes are called antherozoids.
APPEARS IN
संबंधित प्रश्न
A flower of tomato plant following the process of sexual reproduction produces 200 viable seeds.
Answer the following questions giving reasons :
(a) What would have been the minimum number of ovules present in pre-pollinated pistil ?
(b) How many microscope mother cells would minimally be required to produce requisite number of pollen grains ?
(c) How many pollen grains must have minimally pollinated the carple ?
(d) How many male gametes would have used to produce these 200 viable seeds ?
(e) How many megaspore mother cells were required in this process ?
Differentiate between the following:
Self pollination and cross pollination.
Which one of the following is one of the characteristics of self-pollinated flowers?
Fill in the blanks with suitable words.
_______ is a water-pollinated flower.
Mention any two contrivances in flowers which favour cross-pollination.
State four features of flowers pollinated by insects.
Describe the Advantages and Disadvantages of self-pollination to the Plant.
Very short answer type question:
What is hydrophily?
Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.
For which of the following attractants and rewards are required?
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
A dioecious flowering plant prevents both ______.
Pollination occurs in ______.
Plants with ovaries having only one or a few ovules are generally pollinated by ______.
During Hybridization process anther of the bisexual flower is removed before it dehisces is called ______.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Which of the following floral adapation are adapted by hydrophilous flowers?
What is epihydrophily?
Identify the set of correct statements:
- The flowers of Vallisneria are colourful and produce nectar.
- The flowers of waterlily are not pollinated by water.
- In most of water-pollinated species, the pollen grains are protected from wetting.
- Pollen grains of some hydrophytes are long and ribbon like.
- In some hydrophytes, the pollen grains are carried passively inside water.
Choose the correct answer from the options given below:
In sea grass, pollens are long, ribbon like and without exine exhibiting ______ pollination.
