Write the name of the chemical constituents of eukaryotic chromosome with the help of a table. What happens to a cell when the cell loses control at different points in cell cycle on division ? [3+2=5]
OR
What events occur during Anaphase stage of mitotic cell division ?Show the steps of sexual reproduction of flowering plants with the help of word diagram. [3+2=5]
Chemical Constituents of Eukaryotic Chromosome
| Chemical Constituent | Role |
|---|---|
| DNA | Carries genetic information |
| Histone Proteins | Help in packaging and organizing DNA |
| Non-histone Proteins | Involved in regulation of gene expression and chromosome structure |
When a cell loses control at different points in the cell cycle during division, it may result in uncontrolled cell division leading to cancer. The checkpoints which normally regulate the progression of the cell cycle fail, causing abnormal growth and proliferation of cells without the usual regulatory mechanisms.
Or
Events during Anaphase of Mitotic Cell Division
Steps of Sexual Reproduction in Flowering Plants (Word Diagram)
Pollination → Fertilization → Zygote formation → Embryo development → Seed formation → Seed germination
Additional diagram (No need to draw)
More WBBSE Moderate level questions
Write one function each of the following five parts of a neuron: [1×5=5] (a) Dendron (b) Axon (c) Myelin Sheath (d) Schwann Cell (e) Node of Ranvier Or Write one function each of the following five parts of an eukaryotic chromosome: [1×5=5] (a) Chromatid (b) Centromere (c) Nucleolar Organizer (d) Satellite (e) Telomere
Draw a scientific diagram of neuron and label the following parts: [3+2=5] (a) Dendron (b) Myelin Sheath (c) Schwann Cell (d) Node of Ranvier OR Draw a scientific diagram of eukaryotic chromosome and label the following parts: [3+2=5] (a) Centromere (b) Satellite (c) Nucleolar Organizer (d) Telomere
Match the words in Column A with the most appropriate words in Column B and rewrite the correct pair mentioning the serial no. of both columns (any five): [1×5=5] Column A Column B 2.13 Adrenaline (a) Air Pollutant 2.14 Self pollination (b)According to Haldane the hot marine water containing different organic compounds 2.15 The position of flower is axial (c)The adoloscent phase of human development 2.16 Hot Dilute Soup (d)No need of agent 2.17 SPM (e)The senescence phase of human development. 2.18 Britleness of bone and pain at bone joints (f) Increases heart beat, cardiac output and blood pressure. (g) Dominant trait
What advantages did Mendel enjoy owing to pea-flowers being bisexual and self pollinating?
How does the Cytokinesis of plant cell happen?
Mitotic cell division occurs while producing haploid spores.
Spindle fibres and chromosomes are not formed in the ____ cell division.
Which of the following events occurs during sexual reproduction of flowering plants? (a) Zygote is converted into fruit (b) Zygote is converted into seed (c) Unicellular zygote is converted into multicellular embryo (d) Ovary is converted into embryo
In a certain phase of mitosis nuclear reticulum is reconstructed, nuclear membrane reappears, regeneration of nucleolus takes place and Spindle fibre disappears. What is the phase? (a) Prophase (b) Telophase (c) Metaphase (d) Anaphase
Explain the following three significances of cell division- Growth Repair Reproduction Tabulate the site of occurrences of meiotic cell division in the living world. [3+2=5] OR Explain the process of micropropagation. Distinguish between asexual and sexual reproduction on the basis of the following three features - No. of Parental organisms Cell Division Origin of variation [2+3=5]
Write one function of each of the following five parts of the human eyeball: [1 × 5 = 5] (a) Cornea (b) Lens (c) Choroid (d) Vitreous humour (e) Retina OR Mention three changes occurring during the Anaphase stage of mitosis in an animal cell. Write the names of any two structural parts of the eukaryotic chromosome. [ 3 + 2 = 5]
Match the words in column-A with the most appropriate words in column B and re-write the correct pair mentioning the serial no. of both columns COLUMN - A COLUMN - B 1. Meninges (a) Decrease in the number of digits in the legs 2. Sexual reproduction (b) Submergence of islands 3. Roller tongue (c) Centromere 4. Evolution of the horse (d) Telomere 5. Environmental problem of Sundarban (e) Protects brain and spinal cord from mechanical injury 6. Attaches chromosome with spindle fibre (f) Controlled by autosome (g) Occurs through the production of gametes and their union
