Question

I want to know all this questions answer

Answer 1

Q1-DNA

Q2-

1. close the taps when not in use
2. use limited water pertaining to the purpose

Q3-in the Fallopian tube

Q4-

1. many varieties are available
2. normally self pollinate

Q5-it means that a trait that is seen in the phenotype as a result of environmental conditions of its surrounding

Q6-

1. Jean Baptiste De Lamarck
2. Charles Darwin

Q7-The community of living organisms and the non-living part of the environment in a habitat together make up an ecosystem.

two of its components are Biotic and Abiotic

Q8-

1. Water mixed with sewage may however contain E. coli so test for it may help
2. water with excess fertilizers may result in growth of excess algae whose test may help

Q9-given later in the diagram

Q10-during reproduction a male sperms and female egg contains half the number of chromosomes i.e. 23 due to meiosis and hence when they fuse, the chromosomes sum up to the original value i.e. 46 and hence number of chromosomes in parents and offspring are same.

Q11-Thus, the flow of energy in the ecosystem is said to be unidirectional because the energy lost as heat from the living organisms of a food chain cannot be reused by plants in photosynthesis. During the transfer of energy through successive tropic levels in an ecosystem, there is a loss of energy all along the path.

pesticides enter in the food chain through the producers or drinking of contaminated water by any of the consumers.

Q12-the diseases which transfer from male to female during copulation due to ejaculation of male body fluids into female uterus.

eg. AIDS

Q13-Watering harvesting means capturing rain water, where it falls and capture the runoff from, catchment and streams etc. Generally, water harvesting is direct rainwater collection. This collected water could be stored for later use and recharged into the ground water again.

the recharging process promotes conservation of water sources.

Q14-

1. hormonal pills
2. barriers like condoms, diaphragms, spermicides
3. intra-uterine devices
4. surgical methods i.e.vasectomy and tubectomy

the health of the mother remains good for a long period of time and leads to small family and happy family.

Q15-evolution is the slow and continues process whereby complex forms of life have emerged from simpler forms through millions of years.

features, geographical information and fossils.

bird have got their feathers later from dinosaurs and dinosaurs were reptiles.

Q16-introduced by lindemann, it says that only 10% of the energy is transfered from one tropic level to another

1 joule is available to the snake.

Q17-the formation of new and distinct species in course of evolution is called speciation

that is because none of those traits become x linked or y linked to be acquired by the off springs.

Q18-in asexual reproduction the cell divide by dividing into two daughter cells so to maintain the same traits in mother cell and daughter cell, they have to replicate.

variation may lead to evolution of certain species. eg: man evolved from monkey due to years of continuous variations

Q19-

(a)(i)fallopian tube

(ii)uterus

(iii)placenta

(b)turns into embryo in 3 weeks

                    to

   advanced embryo in 5 weeks

                    to

   foetus in 8 weeks

                    to

   infant in 40 weeks

Q20-the transfer of pollen to a stigma, ovule, flower, or plant to allow fertilization.

Self-pollination is the more basic type of pollination because it only involves one flower. This type of pollination occurs when pollen grains from the anther fall directly onto the stigma of the same flower. Although this type of pollination is simple and quick, it does result in a reduction in genetic diversity because the sperm and egg cells of the same flower share genetic information.

Cross-pollination is a more complex type of pollination that involves the transfer of pollen from the anther of one flower to the stigma of a different flower. This type of pollination results in an increase in genetic diversity because the different flowers are sharing and mixing their genetic information to create unique offspring.

Coconut flowers--------------------------------uni sexual

Hibiscus--------------------------------------------bi sexual

After fertilization the zygote divides to form embryo. The fertilized ovule develop into a seed which contain embryo enclosed in a seed coat.As the seed grows the floral parts wither and fall off. Meanwhile the ovary grow in size and ripen to form fruit.

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