Reproduction In Organisms

Step 1: Parthenogenesis का परिचय.
Parthenogenesis का अर्थ है बिना निषेचन (fertilization) के अंडाणु से नए जीव का निर्माण। इस शब्द का निर्माण बोबेसी ने किया था।

Step 2: अन्य विकल्पों का विश्लेषण.
(B) ओवेल → सही नहीं।
(C) सटल → अन्य biological terms से संबंधित।
(D) जोहैनसन → genetics में कार्यरत।

Step 3: निष्कर्ष.
सही उत्तर है (A) बोबेसी।

Step 1: Understand sugarcane propagation.
Sugarcane is primarily propagated by vegetative methods, particularly through cuttings rather than seeds.
Step 2: Review the options.
- Tubers are typically used for propagating plants like potatoes, not sugarcane.
- Cutting of stems is a common method for sugarcane propagation, where a piece of the stem is planted to grow a new plant.
- Bulbs are used in plants like onions or garlic, not sugarcane.
- Seeds are not used in sugarcane propagation, as sugarcane is primarily propagated through stem cuttings.
Step 3: Conclude.
The correct method of propagating sugarcane is by cutting of stems, making option (B) the correct answer.
Final Answer:

Step 1: Analyze the types of reproduction in Amoeba.
Amoeba reproduces asexually through binary fission. In this process, the cell divides into two identical daughter cells, each with a full set of chromosomes. This is the most common mode of reproduction in unicellular organisms like Amoeba.
Step 2: Review the options.
- Fragmentation: This is a form of reproduction where an organism breaks into pieces, each of which grows into a new organism, but it is not common in Amoeba. - Multiple fission: While some organisms may use this method, Amoeba generally uses binary fission rather than multiple fission. - Budding: This type of reproduction occurs in some organisms, like yeast, but not in Amoeba. - Binary fission: This is the correct process by which Amoeba divides into two identical daughter cells.
Step 3: Conclusion.
Therefore, the correct answer is (D) Binary fission.
Final Answer:

Step 1: Understand vegetative propagation.
Vegetative propagation is a method of plant reproduction that involves the use of vegetative parts like tubers, stems, and leaves.
Step 2: Review the options.
- Garlic propagates through bulbs, not tubers.
- Amorphophallus uses corms, not tubers.
- Potato uses tubers for vegetative propagation.
- Mango propagates through seeds and grafting, not tubers.
Step 3: Conclude.
Potato uses tubers for vegetative propagation, making option (C) the correct answer.
Final Answer:

Step 1: Understand water hyacinth pollination.
Water hyacinth can be pollinated by both wind and insects, depending on environmental conditions.
Step 2: Review the options.
- Water hyacinth is commonly pollinated by insects.
- It can also be pollinated by wind, as it has light pollen that can be carried by air currents.
- Therefore, the correct answer is option (D) as it includes both insect and wind pollination.
Step 3: Conclude.
Water hyacinth can be pollinated by both wind and insects, making option (D) the correct answer.
Final Answer:

Step 1: Understand monoecious plants.
Monoecious plants have both male and female flowers on the same plant, unlike dioecious plants where male and female flowers are on separate plants.
Step 2: Review the options.
- Cucumber is a dioecious plant, so male and female flowers are found on different plants.
- Coconut is a monoecious plant, so both male and female flowers are found on the same plant.
- Brinjal and tomato are also dioecious plants, with male and female flowers found on separate plants.
Step 3: Conclude.
Coconut is a monoecious plant, making option (B) the correct answer.
Final Answer:

Step 1: Understand the terms.
The period between birth and death is a key biological concept related to the longevity of organisms.
Step 2: Review the options.
- Life cycle refers to the stages of development of an organism, but it doesn’t specifically denote the period from birth to death.
- Life span refers to the total duration an organism lives, from birth to death, making this the correct answer.
- Birth rate refers to the number of births in a population and is not related to the life period.
- Propagation refers to the reproduction or spreading of organisms, not the period of life.
Step 3: Conclude.
The period between birth and death is called the life span, making option (B) the correct answer.
Final Answer: