How does the atmosphere affect the ecosystem? Gases and particles transported in the atmosphere can deposit to ecosystems both near and far from their sources. Ozone can inhibit plant growth, impacting agricultural productivity and the food supply. Altered patterns of precipitation can in turn lead to ecosystem changes. … What is global ecological system? Global […]

What happens if you only have 44 chromosomes? Unless this chromosome is the X, Y or number 21, the usual result is miscarriage or being born with severe problems. In this case it would almost certainly result in miscarriage. In fact, the 44 chromosome man’s family has a long history of miscarriages and spontaneous abortions. […]

What is spinning around the axis? Earth’s Rotation Earth spins around its axis, just as a top spins around its spindle. This spinning movement is called Earth’s rotation. At the same time that the Earth spins on its axis, it also orbits, or revolves around the Sun. This movement is called revolution. Why does earth […]

What is a key component of ATP? ATP is a nucleotide that consists of three main structures: the nitrogenous base, adenine; the sugar, ribose; and a chain of three phosphate groups bound to ribose. The phosphate tail of ATP is the actual power source which the cell taps. Which is a key component of the […]

How does compact bone differ from spongy bone? Compact bone is dense and composed of osteons, while spongy bone is less dense and made up of trabeculae. Blood vessels and nerves enter the bone through the nutrient foramina to nourish and innervate bones. What is in compact bone but not spongy bone? Whereas compact bone […]

What did Mendel conclude from his experiments with pea plants? Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as […]

Which of the following statements is true for eukaryotic cell? Answer. The true eukaryotic cells are (ii)They have well organised nucleus. Which of the following statements are true about eukaryotes A They are cells with a nucleus b They are found both in humans and multicellular organisms C endoplasmic reticulum is present in eukaryotes D […]

What does a scientist do to test a hypothesis? Scientists (and other people) test hypotheses by conducting experiments. The purpose of an experiment is to determine whether observations of the real world agree with or conflict with the predictions derived from a hypothesis. Furthermore, failure of an experiment does not necessarily mean the hypothesis is […]

What is the chance that a child will carry the HbS gene but not have sickle cell disease? If one parent has sickle cell trait (HbAS) and the other does not carry the sickle haemoglobin at all (HbAA) then none of the children will have sickle cell anaemia. There is a one in two (50%) […]

What is the process of artificial selection? Artificial selection is the process by which humans choose individual organisms with certain phenotypic trait values for breeding. If there is additive genetic variance for the selected trait, it will respond to the selection, that is, the trait will evolve. What is involved in the process of artificial […]