How do organisms reproduce Worksheet-8

How do organisms reproduce Worksheet-8

 

Subjective questions:

  1. What happens to the ovule and the ovary after fertilisation?

 

  1. What is the function of micropyle?

 

  1. What is the end product of double fertilisation?

 

  1. Name two organisms in which multiple fission occurs.

 

  1. Name the artificial methods of vegetative propagation.

 

  1. What is stock in grafting?

 

  1. Name the agencies through which cross-pollination take place.

 

  1. Name the plant where vegetative reproduction occurs through roots.

 

  1. Name two abiotic agents of pollination.

 

  1. Name a plant whose intact leaves produce plantlets along the margin.

 

  1. Give one example of a plant showing vegetative propagation by leaves.

 

  1. Which group of plants shows double fertilisation?

 

  1. Name some ornamental plants which are commercially multiplied by micropropagation.

 

  1. What is the main difference between stem cutting and layering?

 

  1. What is the technical term given to the stalk of the flower?

 

  1. What is the age of puberty in human females?

 

  1. Where are sperms formed?

 

  1. Why testis in man are extra-abdominal in position?

 

  1. Name the most sensitive part of the penis.

 

  1. Name the part of the male reproductive system which carries both sperms and urine.

 

Answer:

  1. After fertilisation ovule changes to seed and ovary to fruit.

 

  1. The micropyle opening serves as a passage for the entry of the pollen tube into the ovule.

 

  1. Seeds and fruits.

 

  1. Malarial parasite and monocystis.

 

  1. Cutting, layering and grafting.

 

  1. Rooted plant is called stock.

 

  1. Water, wind, insects, birds and man.

 

  1. Sweet potato.

 

  1. Wind and water.

 

  1. Bryophyllum.

 

  1. Bryophyllum.

 

  1. Angiosperms (Flowering plants).

 

  1. Orchids, Gladioli, Carnation and Chrysanthemum.

 

  1. In stem cutting, rooting occurs after the stem is detached from the parent plant; whereas in layering, roots are induced before the stem is separated from the parent plant.

 

  1. Pedicel.

 

  1. 10-12 years.

 

  1. Sperrhs are formed in testes.

 

  1. Testis arcpresent outside the abdomen because sperms need lower temperature for their survival.

 

  1. Urethra.

 

  1. Penis.