1. In which of the following mammal estrous cycle is absent:
Answer:
Explanation:
The estrous cycle is common in most mammalian species, with the exception of higher primates such as monkeys and humans who instead experience menstrual cycles. The estrous cycle involves the shedding of the endometrial lining within the uterus while the menstrual cycle involves the shedding of the lining outside the uterus.
2. Identify the incorrect statement:
Answer:
Explanation:
Zoospores are actually a form of asexual reproductive structures found in certain algae and fungi, not sexual reproductive structures.
3. Asexual reproductive structure of sponge:
Answer:
Explanation:
Gemmules are asexual reproductive structures found in sponges. They are internal buds formed during adverse conditions which can later develop into new sponges.
4. Which of the following is developed by parthenogenesis:
Answer:
Explanation:
Parthenogenesis is a type of asexual reproduction in which offspring are produced from unfertilized eggs. In bees, drones (male bees) are produced by parthenogenesis from unfertilized eggs, while the females (queens and workers) are produced from fertilized eggs.
5. _____is formed immediately after fertilization
Answer:
Explanation:
A zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction. It is the first stage in the embryonic development of multicellular organisms.
6. The process which results in the formation of zygote
Answer:
Explanation:
Syngamy is the process where the sperm and egg nuclei fuse to form a zygote. This is the crucial step in sexual reproduction leading to the formation of a new individual.
7. Which of the following is not an asexual reproductive structure?
Answer:
Explanation:
Pollen is involved in sexual reproduction as it carries the male gametic cells to the female ovules.
8. Parthenogenesis is the development of an organism directly from:
Answer:
Explanation:
Parthenogenesis is a type of asexual reproduction where development of an organism occurs directly from an unfertilized egg or female gamete.
9. Which of the following organism reproduces by multiple fission?
Answer:
Explanation:
Multiple fission is a form of asexual reproduction where a cell divides to produce multiple offspring. Among the options provided, Plasmodium, the protozoan parasite causing malaria, reproduces by multiple fission within the mosquito host, resulting in the formation of many daughter cells from a single cell.
10. Which type of stem modification is seen in banana?
Answer:
Explanation:
In a banana plant, the stem is modified into a rhizome, which is a horizontal underground stem. This rhizome helps in vegetative propagation, where new shoots can arise from the nodes of the rhizome, giving rise to new plants.
11. Which animals have developed capacity of regeneration?
Answer:
Explanation:
Both Hydra and Starfish exhibit remarkable regenerative abilities. They can regenerate lost or damaged body parts. In some cases, an entire organism can be regenerated from a single piece of the body, showcasing a high level of regenerative capacity among these animals.
12. Sporulation occurs in _____
Answer:
Explanation:
Sporulation is the process of spore formation. In Plasmodium, sporulation occurs within the mosquito host, where sporozoites are formed which are then transmitted to humans during a mosquito bite, leading to malaria infection.
13. Which plant reproduces vegetatively by roots?
Answer:
Explanation:
Dahlia reproduces vegetatively through its tuberous roots. Each tuberous root can give rise to a new plant when planted in soil, allowing for vegetative propagation which is a type of asexual reproduction in plants.
14. Which plant performs vegetative reproduction with the help of floral buds?
Answer:
Explanation:
Agave plants can reproduce vegetatively through the formation of bulbils in the inflorescence. These bulbils, which are essentially small buds, can develop into new plants once they fall to the ground or are planted in soil. This method of reproduction bypasses the seed formation stage, making it a form of vegetative reproduction.
15. Which part of the plant Bryophyllum performs vegetative reproduction?
Answer:
Explanation:
Bryophyllum is known for its ability to reproduce vegetatively through the buds present on the leaf margins. These buds, when come in contact with soil, can develop into new plants.
16. Juvenile phase represents the period of _____
Answer:
Explanation:
The juvenile phase in plants represents a period of growth before a plant reaches maturity and becomes capable of reproduction. During this phase, the plant grows in size and develops the necessary structures to eventually reproduce.
17. Either male or female reproductive organs are found in the body
Answer:
Explanation:
In dioecious species, individual organisms have either male or female reproductive organs, but not both. This contrasts with monoecious species, where individual organisms have both male and female reproductive organs.
18. Propagules are used to raise _____
Answer:
Explanation:
Propagules are structures in plants that help in vegetative propagation, enabling the growth of new plants. They can be cuttings, bulbs, tubers, or any part of the plant that can give rise to a new plant.
19. Find the monoecious plant
Answer:
Explanation:
Monoecious plants have both male and female reproductive organs on the same individual. Both coconut and cucurbits (a family of plants including squash, pumpkin, cucumber, and watermelon) are examples of monoecious plants, as they possess both male and female flowers on the same plant.
20. Identify the mis-match statement regarding post fertilization events from the following statements.
Answer:
Explanation:
The outer integument is converted into the outer layer of the seed coat, and it’s the inner integument that is converted into the inner layer of the seed coat, not inner endocarp. Therefore, the statement b) is mismatched in the context of post-fertilization events.
21. In these organisms, gametes are released in the surrounding medium
Answer:
Explanation:
In both fishes and amphibians, fertilization often occurs externally, with gametes being released into the surrounding water medium where fertilization takes place. This contrasts with mammals, where fertilization typically occurs internally.
22. Choose the correct statement from amongst the following:
Answer:
Explanation:
Dioecious organisms have distinct male and female individuals, and this characteristic can be observed in both plant and animal kingdoms. For instance, in the plant kingdom, species like willow and date palm are dioecious, and in the animal kingdom, humans and many other species are dioecious.
23. There is no natural death in single celled organisms like Amoeba and bacteria because:
Answer:
Explanation:
Single-celled organisms like Amoeba and bacteria reproduce by binary fission, a form of asexual reproduction where the organism divides into two offspring cells. Each time they divide, they essentially renew themselves, and therefore, they do not experience a natural death in the way multicellular organisms do.
24. Amoeba reproduces by _____
Answer:
Explanation:
Amoeba primarily reproduces by binary fission, where the cell divides into two equal daughter cells, each inheriting a copy of the parent cell’s DNa)
25. What are ciliated spores?
Answer:
Explanation:
Ciliated spores, also known as zoospores, are motile asexual spores equipped with cilia or flagella, which enable them to move in a liquid medium.
26. Non-flagellated spores are called conidia) In which organism they are seen?
Answer:
Explanation:
Conidia are asexual, non-motile spores of fungi. They are produced in a wide range of fungi, including the genus Penicillium, from which they get their name.
27. Which animals reproduce by exogenous budding?
Answer:
Explanation:
Exogenous budding is a form of asexual reproduction wherein the bud, which is an outgrowth due to cell division, develops on the exterior of the parent organism. Hydra is a classic example of an organism that reproduces by exogenous budding, where the bud develops into a new individual and detaches from the parent body once mature.
28. During which process cyst is formed?
Answer:
Explanation:
During multiple fission, a protective covering or cyst forms around the organism to protect it in adverse conditions. When conditions become favorable, the cyst breaks open, releasing the new organisms formed through fission.
29. In which method of reproduction, pseudopodiospores are formed?
Answer:
Explanation:
The term pseudopodiospores doesn’t have a standard definition in the context of common biological reproductive methods. It might be a term used in very specific or uncommon contexts.
30. Antherozoids are the gametes formed in
Answer:
Explanation:
Antherozoids are male gametes found in both Bryophytes and Pteridophytes, as well as in some Algae.
31. During which process cyst is formed?
Answer:
Explanation:
(Same as question 29)
32. In which organism multiple fission is seen?
Answer:
Explanation:
Multiple fission is a common reproductive method in Plasmodium, where a single cell divides to form many daughter cells.
33. Which of the following is not a natural method of vegetative reproduction?
Answer:
Explanation:
Cutting is an artificial method of vegetative propagation where a part of the plant is cut and planted to form a new plant.
34. Which type of fission takes place in Euglena?
Answer:
Explanation:
Euglena reproduces by longitudinal binary fission, where the cell divides along its length to form two daughter cells.
35. The plants which bear two types of heterospores during the Sporophytic stage is known as _____
Answer:
Explanation:
Heterosporous plants produce two different kinds of spores – microspores and megaspores, during their sporophytic stage.
36. Which of the following group of animals show regeneration?
Answer:
Explanation:
Planaria, Hydra, and Starfish are known for their remarkable ability to regenerate lost body parts, and in some cases, an entire organism can be regenerated from a single piece of the body.
37. Offspring formed by sexual reproduction exhibit more variation than those formed by Asexual
Answer:
Explanation:
Sexual reproduction involves the fusion of gametes from two different parents. Each parent contributes half of the genetic material, resulting in a unique combination of genes in the offspring. This mixing of genes leads to genetic variation, which is a significant advantage of sexual reproduction. In contrast, asexual reproduction involves a single parent, and the offspring are genetically identical or very similar to the parent, leading to less genetic variation.