Biology Test 14

The copper-T is also known as intra-uterine device. It is a loop which is placed in the uterus and prevents fertilization and implantation.

In amniocentesis the fluid, which is immediate surroundings of foetus.

PREVEN is the emergency contraceptive kit approved by Food and Drug Administration (FDA).

One major factor for this is that the medical facilities has greatly improved in 20th Century. So advanced medical care is the correct answer.

A few flowering plants such as some species of Asteraceae and grasses, have evolved a special mechanism, to produce seeds without fertilisation, called apomixis. Apomixis is a form of asexual reproduction that mimics sexual reproduction.

Pteris, a pteridophyte, do not have free-living independent existence in their male and female gametophytes.

Conjugation is a sexual process in which two lower organisms of the same species, such as bacteria, protozoans and some algae and fungi, exchange nuclear material during a temporary union (e.g., ciliated protozoans), completely transfer one organism’s contents to the other organism (bacteria and some algae), or fuse together to form one organism (most bacteria and fungi and some algae).

In male gonads, secondary spermatocyte, spermatids and spermatozoa represent haploid (n) cells, whereas primordial germ cells, spermatogonia and primary gametocyte represent diploid (2n) cells.

In oogamous type of sexual reproduction, the female gamete (ovum/egg) is big, passive while male gametes (spermatozoids) are smaller, active and motile.

In a flower, the outer most whorl is known as sepal (green colour usually). Inside this, petals of different colours are arranged. Inside the petals, stamens (male reproductive parts of the flower) are located. Carpels (female reproductive parts of the flower) are placed centrally in the flower. It forms the inner most whorl of the flower.