Which of the following is not a product of the light reactio

Which of the following is not a product of the light reactions of photosynthesis?

oxygen

ATP

sugar

NADPH

All of the following colors of light are used for photosynthesis except

orange

green

violet

blue

If you are heterozygous for sickle-cell anemia, you will be more likely to get malaria.

True

False

Asexual reproduction produces genetically identical individuals because

cell division occurs only in meiosis

no meiosis or fertilization take place

chromosomes do not have to replicate during asexual reproduction

it involves chromosome replication without cytokinesis

Animals inhale air containing oxygen and exhale air with less oxygen and more carbon dioxide. Plants use the carbon dioxide to make

ATP

water

oxygen

sugar

When does crossing over occur?

prophase I

metaphase I

prophase II

anaphase I

Solution

1. Sugar is not a product of light reaction because it produces in dark reaction. Oxygen, ATP, NADPH are the actual products of light reaction.

2. Green color is not utilized in photosynthesis because green color is reflected out from the leaf surface and remaining colors are absorbed by the pigment molecules involved in photosynthesis. Rate of photosynthesis is high at Blue and red light followed by orange (is absorbed by carotene pigment)

3. False. Heterozygous sickle cell anemia gives resistance against malaria parasite that infects red blood cell. If the red blood cell become sickle shaped plasmodium is unable to live there. Sickle cell anemia become problem only when it is homozygous, because all red blood cells become sickle shaped and reduces the oxygen carrying capacity. But in heterozygous condition only 50% RBC become sickle and remaining supplies the oxygen.

4. Asexual reproduction produces genetically identical individuals because meiosis do not occurs and fertilization is absent. If both meiosis and fertilization occurs it leads to variations.

5. Plants used carbon dioxide to make sugar. Carbon dioxide undergo reduction reaction to convert into sugar during photosynthesis.

6. In meiosis crossing over occurs at prophase I. Prophase I has sub stages like leptotene, zygotene, pachytene and diakinesis. Among these substages, during pachytene crossing over and genetic material exchange occurs.