Why are the mitotic divisions in the functional megaspore nucleus called free-nuclear divisions?

Can an unfertilised apomictic embryo sac give rise to a diploid embryo? If yes, then how?

Banana is a true fruit as well as a parthenocarpic fruit. Give reason.

The meiocyte of an onion plant contains 32 chromosomes. Work out the number of chromosomes found in its endosperm.

Give the other name of the following : pollen sacs, ovule, pollen grains, embryo sacs.

The plant Yucca and moth cannot complete their life cycle without each other. Why?

Name the type of pollination that ensures genetic variation.

If favorable conditions like adequate moisture, oxygen and suitable temperature, are not available then the embryo may enter a state of inactivity. Name this state of inactivity.

A general mechanism to prevent the self pollen from fertilizing the ovules by inhibiting pollen germination or pollen tube growth on the pistil. Name the mechanism?

A flower is large in size, colorful and has notaries. This type of adaptation corresponds to which pollination strategy?

Unisexual flower have pollen grain which are small, dry, non-sticky. Stigma and style of such flowers are well exposed and hairy. Name the pollinating agent.

Write the correct name of the following:
i) Three cells present at the chalazal end in the embryo sac.
ii) A small pore in the ovule through which the pollen tube enter.
iii) Wall of fruit having mesocarp, endocarp, epicarp.
iv) Two cells present on either side of egg cell in an embryo sac.
v) Mass of parental cells enclosed within the integument.

It is made of sporopollenin, which can withstand high temperature and action of strong acids or alkalis, no enzymes can degrade it and hence pollen grains are well preserved as fossils. Name the layer.

Vijaya started sneezing and developed some rashes on her hand after returning from her school garden. What causes such type of reaction?

Holding a flower the teacher asked Hena to show the part of a flower which has four-sided (tetragonal) structure consisting of four sporangia grouped as a pair in each lobe. What would be the part of the flower? Can you guess?

It is the tissue in the ovary on which the ovules develop and are attached to the ovary wall.  Name this tissue located inside the ovarian cavity?

Banana is a fruit as well as a parthenocarpic fruit. Give reason.

Why is banana considered a good example of parthenocarpy?