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प्रश्न
Pranav and Preeti are twins in your class. They belong to ___________ twins type.
उत्तर
Pranav and Preeti are twins in your class. They belong to dizygotic twins type.
APPEARS IN
संबंधित प्रश्न
…………. is a mode of asexual reproduction.
(a) Cloning
(b) Budding
(c) Pollination
(d) Germination
Describe briefly how regeneration is carried out in multicellular organisms like Hydra.
Name the part of Bryophyllum where the buds are produced for vegetative propagation.
What happens when a Planaria gets cut into two pieces?
Explain how non-reproductive structures protect themselves and what is the function of the structures released from the 'blobs' in Rhizopus.
A tadpole develops into an adult frog by the process of ______.
Fertilisation is necessary even in asexual reproduction.
..................... type of reproduction occurs in Hydra.
(a) Binary fission
(b) Multiple fission
(c) Budding
(d) Fragmentation
State whether the following statement is true or false :
Spores produced by the bread mould plant are actually its seeds.
Name one organism which reproduces by spore formation
Name two plants which are propagated by layering method.
Name three common methods which are used for the artificial propagation of plants.
What is meant by the term 'fission' as used in biology?
What is a tuber? Name one stem tuber and one root tuber.
Name two organisms which reproduce by the same asexual process as that of Amoeba.
What is the difference between the cuttings method and grafting method for the artificial propagation of plants?
Describe the cuttings method for the artificial propagation of plants. Illustrate your answer with the help of labelled diagrams.
The unicellular organism which reproduces by budding is :
(a) Spirogyra
(b) Hydra
(c) Planaria
(d) Yeast
The thread like structures that develop on a moist slice of bread in Rhizopus are ______.
Write a short note on Grafting.
Fill in the blank:
Fungi, ferns and mosses reproduce by ____________________.
State whether the following statement is true (T) or false (F):
Reproduction by spores is a method of asexual reproduction.
Explain the process of binary fission in bacteria.
What happens when a mature spirogyra filament attains considerable length?
Name the following :
Explain the structure and the function of the structures released from the ‘blobs’ in Rhizopus.
What is fragmentation in organisms?
In hydra the type of reproduction is ___________.
Rewrite the following statement by selecting the correct option.
When Hydra becomes matured, _________ takes place in it.
Why is chemical communication better than electrical impulses as a means of communication between cells in a multi-cellular organism?
Name four plants which can be propagated by root-cutting
Name the parts of the plants used to grow following flower: Gladiolus
Why anther is called as tetrasporangiate structure?
Define.
Fragmentation
Which of the following methods of asexual reproduction are observed in lower organisms?
The asexual reproduction in bacteria occurs by ______.
The ability of an organism to develop a whole body from a broken piece or fragment is called ______
In Rhizopus, tubular thread-like structures bearing sporangia at their tips are called
Which of the following statements are true for flowers?
- Flowers are always bisexual
- They are the sexual reproductive organs
- They are produced in all groups of plants
- After fertilisation they give rise to fruits
Mustard was growing in two fields- A and B. While Field A produced brown coloured seeds, field B produced yellow coloured seeds.
It was observed that in field A, the offsprings showed only the parental trait for consecutive generations, whereas in field B, majority of the offsprings showed a variation in the progeny.
What are the probable reasons for these?
Name the asexual reproductive structure of Chlamydomonas.
