11. Viral DNA is removed from the host’s chromosomes and the lytic cycle is called which of the following process?
[A] spontaneous induction
[B] inductive infection
[C] resultant induction
[D] spontaneous infection
Show Answer
Correct Answer: A [spontaneous induction]
Notes:
Viral DNA is removed from the host’s chromosomes and the lytic cycle is called spontaneous induction.
12. What is the fusion of mature individuals that directly act as gametes called?
[A] Isogamy
[B] Anisogamy
[C] Hologamy
[D] Autogamy
Show Answer
Correct Answer: C [Hologamy]
Notes:
In Chlamydomonas, two mature individuals participate in sexual reproduction called hologamy.
13. Which of the following performs an important function of flowers?
[A] They help in the process of reproduction
[B] They produce diaspores without fertilization
[C] The gametophytes develop inside the flower
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Flowers perform the following important functions: they help in the process of reproduction, they produce diaspores without fertilization, gametophytes develop inside the flower, flowers attract insects and birds which then transfer pollen from one’s anther act as a medium to Flowers till the stigma of another flower, the ovary of the flower develops into a fruit that contains the seed.
14. Which of the following is not a characteristic of leaves?
[A] leaf arises from the node
[B] It is exogenous in origin
[C] It has a bud at its axis
[D] produce diaspores without fertilization
Show Answer
Correct Answer: D [produce diaspores without fertilization]
Notes:
Characteristics of leaves: The leaf emerges from the node, it is exogenous in origin, has a bud on its axis, the growth of the leaf is limited, the leaves do not have an apical bud.
15. ___ is the product of aerobic respiration.
[A] Malic acid
[B] Pyruvate
[C] Ethylene
[D] Lactose
Show Answer
Correct Answer: A [Malic acid]
Notes:
The citric acid cycle is involved in aerobic respiration. The end products of aerobic respiration are carbon dioxide and water. Aerobic respiration occurs in the mitochondria of the cell and produces many by-products.
16. In which of the growing tissues are cytokinins most abundant?
[A] roots
[B] embryos
[C] fruits
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Cytokinins are most abundant in growing tissues – such as roots, embryos and fruits, where cell division is taking place.
17. Pollination where the transfer of pollen between anthers and stigmas of different flowers of the same plant or different plants of the same species is called__.
[A] Self-Pollination
[B] Cross-Pollination
[C] Fertilization
[D] Adoption
Show Answer
Correct Answer: B [Cross-Pollination]
Notes:
Pollination where the transfer of pollen between anthers and stigmas of different flowers of the same plant or different plants of the same species is called Cross-Pollination.
18. Cnidarians, which exhibit only polyp stage__
[A] Cubozoa
[B] Scyphozoa
[C] Anthozoa
[D] Hydrozoa
Show Answer
Correct Answer: C [Anthozoa]
Notes:
The class Anthozoa includes all cnidarians that exhibit only a polyp body plan. There is no middle stage in their life cycle.
19. What is the common name of a devilfish?
[A] Loligo
[B] Sepia
[C] Teredo
[D] Octopus
Show Answer
Correct Answer: D [Octopus]
Notes:
Octopus is the common name of a devilfish due to the presence of eight muscular arms or tentacles.
20. Which of the following are armored fish?
[A] Chondrichthyes
[B] Osteichtliyes
[C] Placoderms
[D] Acanthodians
Show Answer
Correct Answer: C [Placoderms]
Notes:
Placoderms are armored fish. The placoderms are a class of armored prehistoric fish, known from fossils, that lived from the Silurian to the end of the Devonian period.
