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100% VERIFIED BIOLOGY THEORY ANSWERS
👑 2020 JUPEB BIOLOGY ANSWERS👑
100% VERIFIED BIOLOGY OBJ ANSWERS
100% VERIFIED BIOLOGY THEORY ANSWERS
(i) Nucleus: carries chromosomes on which genes are coded
(ii) Plasma membrane: Regulates the movement of substances in and out of the cell.
(iii) Ribosome: Site for protein synthesis
(iv) Chloroplast: Seat of photosynthesis where organic foods are synthesized
(v) Ribosomal Endophosmic Reticulum: Provides surface for the attachment of Ribosome
(vi) Golgi apparatus: likely helps in the distribution of protein made by the cell
(vii)Mitochondria: centre of cellular registration in which food substances are oxidized to release energy for the activities of the cells.
(viii) Cell Wall: Give rigidity to the cell
(ix) Lysosome: Destroy worm out parts of cells
(x) stores nutrition and waste products
(i) Both have cell walls
(ii) Both undergo cell division
(iii) Both have dexyribonucleic acid (DNA)
– Prokaryotic Cell
(i) Mitochondria absent
(ii) Chloroplasts absent
– Eukaryotic cell
(i) Mitochondria present
(ii) Chloroplasts present
(i) It leads to destruction of soil structure
(ii) It causes soil compaction due to its heavy weight
(i) It cannot be used very well in tropical environment
(ii) It is not as strong as the disc plough
Conservation is the management of nature with the aim of protecting species, their habitats, and ecosystems from excessive rates of extinction.
The process of protecting an endangered plant or animal species in its natural habitat is known as In-situ conservation. On the other hand, ex-situ conservation is the relocation of endangered or rare species from their natural habitat to protected areas equipped for their protection and preservation.
Merit of In-situ
(i) It is often both the species and habitat that are conserved
(ii) large population can be protected
(iii) Biodiversity permanently protected
Demerit of In-situ
(i) It can be difficult to control some factors that are threatening a species for example poaching, predators, disease or climate change
Merit of ex-situ
(i) It guarantees that organisms are well protected
(ii) the species are also well and better cared for
(iii) organisms are completely protected from predation and poaching
(iv) Health of individual organisms can be monitored and medical assistance given as required
Demerit of ex-situ
(i) It only protects a limited number of species
(ii) the scale of protection is smaller
(i) They breakdown organic matter, releasing carbon, oxygen, nitrogen and phosphorus into the soil and atmosphere.
(ii) Fungal hyphae physically bind soil particles together, creating stable aggregates the helps increase water inpritration and soil water holding capacity.
(i) They Eukaryotic organisms
(ii) Non – Motile
(iii) Mostly multi cellular except yeast (unicellular)
(iv) They lack chlorophyll
(v) They are decomposed
(vi) It cell walls are made of chitin
Micro organism | disease caused | common source
(i) Bacteria | cholera | water
(ii) Virus | common cold | air
(iii) protozoa | Amoebic dysentery | food and water
(iv) Fungi | Ring worm | contact with infected person
(v) algae | rash | water
(vi) Rickettsia | Tick tyohus | Tick
Yeast reproduces a sexually in which a new cell is produced as an outgrowth of a parent cell I.e by building.
Diagram [CLICK HERE]
A tissue is a collection of cells which are similar in structure and perform similar functions. They have the same origin and occupy the same position in the body of the organism
(i) muscular tissue
(ii) nerve tissue
(iii) epithelial tissue
(iv) skeletal tissue
(i) Muscular tissue : these are tissues of the muscles. They are strong bands of white fires. They help in the movement of the part of the body
(ii) nerve tissue: Found in the brain, spiral cord and nerves. Co-ordinate and conducts impulse
(iii) epithelial tissue: Found in the skin and lines the tube
(iv) skeletal tissue : Found in bones. Support the body and aids movement
Hydra reproduce sexually through a process known as budding. For Hydra, this is the most common mode of reproduction and occurs under favorable environmental conditions. During budding, a small bud develops near the basal part of the parent Hydra through repeated mitotic division of the epidermal interstitial cells. As mitotic division continues the cell differentiation results in the development of the coelenteron, the mouth part as well as the tentacles. Once it is fully developed, it constricts as the base (point of attachment to the parent Hydra) and ultimately separates to become an independent organism. This process may take about 3 days from start to end.
Hydra is a simple multicellular animal. It has a number of tentacles around its mouth, which are used for ingestion of food. These tentacles entangle small aquatic animals and kill them with their stinging cells. After this they push them into their mouth. Now inside their body cavity digestive juices are secreted by the surrounding cells. These juices digest the food and the digested food is absorbed through the cavity walls and assimilated in the cells.
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