AIIMS Botany Human Reproduction Class 12 Questions

Which of the following are homosporous

Choose the correct option

Choose the correct one

Assertion : Parturition is induced by neural signal in maternal pituitary. Reason : At the end of the gestation period, the maternal pituitary releases prolactin which cause uterine contractions.

Pollination in Rafflesia is occurred by

Ploidy level of Nucellus, endosperm, polar nuclei, Megaspore mother cell, female gametophyte respectively are

Which hormone helps in detection of pregnancy?

Which of the following condition is true at the time just after ovulation?

Fibroid (leiomyoma) uterus is a-

Meiosis II in ovum doesn't completes until –

Assertion: Organism that reproduce by binary fission are immortal Reason: Such organism have special kind of rejuvenation capability.

Assertion: In females, parturition occurs after the pregnancy. Reason: Signal for parturition originates from fully developed embryo.

Gemmule formation is a common mode of asexual reproduction in

Read the Assertion and Reason carefully to mark the correct option from those given below Assertion Endosperm is formed by the fusion of one male gamete and two polar nuclei. Reason In pea, the endosperm remains the part of seed as it is not completely used up during embryo development.

The fluid which is rich in calcium èbrinolysin and acid phosphatase and contributes about 30% of the total volume of semen, is released by

Read the Assertion and Reason carefully to mark the correct option from those given below Assertion The technique shown in the given figure is frequently used in prenatal disease treatment. Reason This technique cannot be used for sex-determination of child.

Pollination in Rafflesia is occurred by

In which of the following sets of organisms, does the external fertilization occur?

Starting from the maximum, arrange the following male reproductive accessory organs in the correct order, based on the amount of secretion poured into urethra. (i) Prostate gland (ii) Seminal vesicle (iii) Bulbourethral gland

Occurrence of triploid (3n) primary endosperm nucleus is a characteristic feature of

The pollen grains of rice and wheat lose their viability in ___ minutes of their release.

After double fertilization, a mature ovule has

Assertion: A mutual exchange of sperms occurs between two earthworms during mating. Reason: Mature sperms and egg cells and nutritive fluid are deposited in cocoons produced by gland cells of clitellum.

Assertion: In a regular medical examination of a small population, a 35 years old lady was found to have higher levels of oestrogens, progesterone in her blood. Reason: The lady is 12 weeks pregnant.