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प्रश्न
What is hilum with respect to ovule?
उत्तर
Hilum is the point of attachment of funiculus to the main body of ovule.
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संबंधित प्रश्न
Define reproduction.
Why is DNA copying an essential part of the process of reproduction?
Explain the importance of reproduction in organisms.
Find the odd one out:
Amoeba, Euglena, Planaria, Paramoecium
What is the basic difference between asexual reproduction and sexual reproduction?
In asexual reproduction, two offsprings having the same genetic material and the same body features are called :
(a) callus
(b) twins
(c) clones
(d) chromosomes
Fill in the following blank with suitable word :
The union of a sperm nucleus with an egg nucleus is known as.......... and results in a .........egg.
Match the following:
| Column ‘I’ | Column ‘II’ |
|
(1) Inhibits plant growth
|
(a) Breaks large fat globules into smaller ones
|
|
(2) Cytokinins
|
(b) Auxins
|
|
(3) Cellular respiration
|
(c) Mitochondria
|
|
(4) Bile
|
(d) Promote cell division
|
|
(e) Abscisic acid
|
The number of meiotic and mitotic divisions necessary for development of female gametophyte in angiosperms is ______.
The single shield-shaped cotyledon in monocot seed is known as ______.
The example of dicot endospermic seed is ______.
Nebenkern is ______.
Nervous system develops from ______ of embryonic layer.
What is morula?
Match the following.
| Column I | Column II |
| Fission | Spirogyra |
| Budding | Amoeba |
| Fragmentation | Yeast |
Explain the term reproduction.
Assertion and Reason types of Question.
Assertion: Corm is a condensed form of Bulb.
Reason: It has dry and fleshy scale leaves.
In the list of animals given below, hen is the odd one out.
| human being | cow | dog | hen |
The reason for this is
Observe the following figures.
 |
 |
 |
|
| (a) | (b) | (c) | (d) |
- Identify the stages (a) to (d) in figure during development of human baby.
- Arrange the stages in correct sequence of development.
- Explain the development that takes place in any one stage.
Give reason for the following:
All multicellular organisms cannot give rise to new individuals through fragmentation or regeneration.
