Write one advantage of self-pollination.

Which of the following statements about self-pollination is correct? Self-pollination occurs within the same flower. New characters do not arise by self-pollination. The chance of pollination failure is less if self-pollination is not dependent on an external agent. Seed production is higher if self-pollination is not dependent on an external agent. (a) 3 (b) 1 (c) 4 (d) 2

Give an example of an ornithophilous (bird-pollinated) flower.

Give an example of an ornithophilous flower

As the flowers of pea plant are unisexual, so self-pollination and if needed, cross pollination can be performed.

____ is an entomophilous flower.

Identify which of the following statements is not true regarding cross-pollination — (a) Requires agent (b) Origin of new hereditary features (c) Maintains the purity of species (d) The rate of germination of seeds is higher

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

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

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]

What advantages did Mendel enjoy owing to pea-flowers being bisexual and self pollinating?

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