CBSE Biology Fundamentals

Yes, it is correct. The temperature at which a substance ignites and begins to burn is called the flash point. The flash point of wood is 572 degrees. Once wood reaches its flash point, it creates a substance which reacts with oxygen to create a flame. The flame heats the wood, which then spreads the flame. This process explains how fires can spread even in very cold weather. Lightning and earth quakes are the main reasons for this.

 Yes, it is correct. It maintains the record of all flora and fauna species that are endangered.

 Yes, it is correct. Plant cell has many chloroplasts. Chloroplasts are distributed in a plant cell. They trap sunlight to aid in photosynthesis.

 Yes, this is correct as this is the only pair in which both are eukaryotes. Their cells have a well organized nucleus.

Yes, it is correct. Eye colour is the colour of iris. It can be blue, gray, green, black or brown.

 Yes, it is correct. There are some organisms in which the young ones resemble their adults and humans are one of them.

 Yes, it is the incorrect statement. Cell wall is the outermost covering of the cell. If it is not present then cell membrane is the outermost covering.

 Yes, it is correct. White blood cells do not have any particular shape. Its like amoeba, no definite shape.

 Yes, it is correct. Virus require cells of host to reproduce.The process is called lytic cycle.

 Yes, it is correct. As microorganisms are present everywhere (in water, air, and soil). In fact, micro-organisms can survive under all types of environment. The black round structure seen growing when observed under microscope was found to be microorganisms.

 Yes, it is correct as malarial parasite is transmitted from one place to another by female Anopheles mosquito and not by a housefly.

Yes, it is the correct answer. This is the only incorrect statement. Lacto bacillus (bacteria) promotes the conversion of milk into curd, not yeast.

Yes, it is correct. These are the names of commonly used antibiotics obtained from different bacteria and fungi.

Yes, it is correct. Both are obtained from animals. Silk is obtained from silk worm and wool from sheep or rabbit, etc.

 Yes, it is correct. In plasmodium, asexual or sexual reproduction takes place. It depends on their life cycle.

 Yes, it is the correct answer. It releases the harmones that control the activity of other endocrine glands. It also releases growth harmones.

 Yes, it is correct. Manures which are decomposed organic matter increase the nutrient content of soil for healthy growth of plants. They are the fertilizers which in long run make the soil less fertile.

Yes, it is correct. It is an air borne diseses. Patient should be kept in isolation.

 Yes, it is correct. In the female, the production and release of ova or the egg follows a cyclic process every 28-30 days. This cycle is governed by hormones and is called the menstrual cycle. The first menstruation is called menarche. Menarche occurs during puberty.

 Yes, it is correct as a plant has a cell wall, chloroplast, a centrally placed vacoule and a nucleus, present near the side wall.

 Yes, it is correct as pasteurization involves the boiling of milk at temperature 70⁰C and then rapid cooling to store it.

 Yes, it is correct. The red blood cells in humans contain no nucleus.

 Yes, it is correct. This is a type of plastid which have yellow, orange or red colour. It is found in petals of flower, fruits, etc. This colour is due to two pigments, carotene and xanthophyll.

Yes, it is correct. Water is not used as preservative for food item as it favours the growth of microorganisms which spoil the food.

 This is the correct answer as it does not describe the chloroplast. Instead it is the leucoplast present in those parts which are not exposed to sunlight.