Question . A cross between a tall plant (TT) and a short plant (tt) resulted in progeny that was all tall plants as
(a) Tallness is the dominant trait. (b) Shortness is the dominant trait. (c) Tallness is a recessive trait. (d) The height of the plant is not governed by the gene T or t.
Ans: (a) Tallness is the dominant trait.
The castor bean or castor oil plant, Ricinus communis, is a species of perennial flowering plant in the Euphorbiaceae (spurge) family. Ricinus communis, also known as the “palm of Christ,” is a member of the Euphorbiaceae family and is also known by the names Jada (Oriya), Verenda (Bengali), Endi (Hindi), Errandi (Marathi), and Diveli (Gujarati).
Ricinus communis: Scientific classification, Origin, Discovery, Description and Uses Read More »
The Roma tomato, also known as a plum tomato, is widely used for canning and making tomato paste due to its strong and slender structure. Roma tomatoes, often referred to as Italian tomatoes or Italian plum tomatoes, are frequently seen in stores in several nations.
Roma Tomatoes: Introduction, Classification, Origin, Characteristics, and Uses Read More »
Color blindness, also known as color vision deficiency, is the inability to distinguish certain colors in the visible light spectrum. It affects around 8% of men and 0.5% of women, with the most common type being red-green color blindness.
Color blindness can be caused by genetic factors or acquired through injury or disease.
Symptoms include difficulty distinguishing between colors, difficulty identifying colors, and difficulty seeing color in low light or bright light.
Treatment for color blindness is not available, but people with the disorder can often find ways to adapt, such as using color-coded objects or specialized lenses.
Dairy farming is the practice of raising dairy animals for the production of milk and other dairy products, such as cheese, butter, and yogurt. Dairy farming involves a variety of activities, such as breeding, feeding, and milking the animals, as well as caring for them and managing the overall operation of the farm. It also includes processing, packaging, and marketing of the dairy products.
Question: Define Immunity. Name its types.
Answer: Immunity is the ability of the body to protect itself from foreign substances, organisms, or toxins.
The three types of immunity are innate immunity, adaptive immunity, and passive immunity.
Zoology: Solved Previous Year Question Paper for NCERT/ CBSE Class 12th Zoology Read More »
Question: Define Fertilization. Briefly enlist the events that take place during Fertilization.
Answer: Fertilization is the fusion of a sperm cell and an egg cell to form a single cell that has genetic material from both the egg and the sperm.
Events that take place during Fertilization:
1. Sperm binds to the egg and penetrates its outer layer.
2. The sperm and egg nuclei fuse, forming a single nucleus.
3. The egg is activated and begins the process of cell division.
4. The zygote begins to divide into two cells, then four cells, and so on.
5. The zygote starts to travel down the fallopian tube towards the uterus.
Question: (i)What is primary productivity ?
(ii) Why does it vary in different ecosystems ?
(ii) State the relationship between gross and primary productivity.
Answer: (i) Primary productivity is the rate at which energy is converted into organic matter by living organisms such as plants within an ecosystem.
(ii) It varies in different ecosystems due to the availability of resources, environmental factors such as temperature and light intensity, and the presence of other organisms.
(iii) The relationship between gross and primary productivity is that gross productivity is the total amount of energy produced by an ecosystem, while primary productivity is the amount of energy converted into organic matter. Gross productivity is the sum of all primary production, as well as respiration processes such as decomposition and consumption.
Question: With the help of a flow diagram explain the flow of energy in an Ecosystem.
Ans: → Solar Energy from Sun → Plants (Photosynthesis) → Consumers (Herbivores) → Consumers (Carnivores) → Decomposers (Bacteria and Fungi) → Nutrients (Carbon Dioxide, Nitrogen, etc.) → Plants (Respiration) → Consumers (Herbivores) → Consumers (Carnivores) → Decomposers (Bacteria and Fungi) → Nutrients (Carbon Dioxide, Nitrogen, etc.) → Solar Energy from Sun
Question: Do you think microbes can also be used as a source of energy? If yes, how?
Ans: Yes, microbes can serve as a source of energy. Biomass may be used by microbes to produce biofuels like ethanol and biodiesel that can replace fossil fuels.
