Sexual Reproduction in Flowering Plants — BIOLOGY STD 12 Science — Question

Draw a diagram showing a developing foetus within the uterus and label six parts in it.

Define genetic engineering. Name one natural genetic engineer of plants.

A cross was carried out between two pea plants showing the contrasting traits of height of the plant. The result of the cross showed 50% of parental characters

1. Work out the cross with the help of a Punnett square.
2. Name the type of the cross carried out.

Both coconut palm and date palm produce staminate flowers. One is monoecious and the other is dioecious. Write the difference.

Write the types of sex-determination mechanisms the following crosses show. Give an example of each type.

1. Female XX with male XO
2. Female ZW with male ZZ.

What are secondary pollutants? Give two examples.

1. List any four characteristics of an ideal contraceptive.
2. Name two intra uterine contraceptive devices that affect the motility of sperms.

A bisexual flower that never opens, is called _______.

Out of many papaya plants growing in your garden, only a few bear fruits. Give reason.

If there are two pathogenic viruses, one with DNA and other with RNA, which would mutate faster? And Why?