Posted on: 11:40 Thu, 21 Jun 2018

WELCOME TO JFT 2018 JUPEB BIOLOGY & BUSINESS STUDIES ANSWER PORTAL
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BUSINESS STUDIES OBJ:-
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11-20: DBDCBAACDD
21-30: CADDBBACAB
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BIOLOGY OBJ:-
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BIOLOGY ESSAY ANSWER:

2a.)Evolution is The process by which different kinds of living organisms are believed to have developed from earlier forms during history Of The earth

2ai.
Divergent evolution occurs when two separate species evolve differently from a common ancestor. ...
Convergent evolution occurs when species have different ancestral origins but have developed similar features. A good example of
convergent evolution is the similarities between the hummingbird and the hummingbird moth

2aii.
the major difference between ammensalism and
commensalism is that both organisms benefit in Ammensalism while only one organism benefits in
commensalism but the other one is not affected. ... The other organism that does not benefit remains neutral and is not harmed.



2c.

Asexual division; Mitosis occurs in somatic cells .
Somatic cells (or vegetative cells) are cells that make up the bodies of living organisms, other than the sex cells.
Somatic cells include muscle cells, bone cells, skin cells, nerve cells, etc. (collectively known as body cells)
Sexual division; Meiosis occurs in sex cells or gametes.
In animals like humans, meiosis takes place in male sperm cells and female egg cells in order to prepare them for sexual reproduction.
In plants , sex cells are located in the pollen in the stamen and egg cells in the pistil .
Duration
Mitosis involves only one cell division that is composed of four major phases: prophase, metaphase ,
anaphase, and telophase.
Meiosis is quite longer as it involves two successive divisions that results to the reduction in chromosome number.
Basically, it is divided into two: meiosis I and meiosis II. Meiosis I and II have the same phases like mitosis, only different in some events.
Number of chromosomes
Only one division results to diploid (2n) offspring
Two divisions results to haploid (n) offspring
Number of daughter cells produced
Two. The resulting daughter cells are genetically the same because no recombination occurred during the process.
Iv. The chromosome number of the resulting daughter cells is reduced by half (becomes haploid, n).
It is only during reproduction process that such diploid state is restored in the offspring.

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(3a)
Autotrophic nutrition means that simple inorganic substances are taken in and used to synthesise organic molecules. Energy is needed to achieve this. In photo- autotrophic nutrition light is the energy source. In most instances the light source is solar energy, the process being photosynthesis.

(3b)
The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the
thylakoid membranes of organelles called chloroplasts.

(3c)
I. Blue green accessory pigment
Ii. Orange pigment

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