STD 12 - 1. sexual reproduction in flowering plants — NEET STD 11 Science — Question

Assertion: Meiosis ensures the production of haploid phase in the life cycle of sexually reproducing organisms whereas fertilisation restores the diploid phase.
Reason: Four haploid cells are formed at the end of meiosis which are similar to each others.

Which type of tissue is involved in functions like forming a diffusion boundary

Mitochondria arises

Which of the following plant does not have Rhizoblum containing root nodules?

In which phase synapsis process start?

Given below are two statements :
Statement I :
The use of drugs and alchohol damages nervous system and liver.
Statement II :
The use of drugs and alchohol during pregnancy is also known to adversely affect the foetus.
Choose the correct answer from the options given below

Gametophytic generation is dominant in

What is common between chloroplasts, chromoplasts and leucoplasts?

Which of the following statements are not true for microsporogenesis ?
(i) The centre of each microsporangium occupied by sporogenous tissue.
(ii) The cells of the sporogenous tissue undergo meiotic divisions to form microspore tetrads.
(iii) Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad.
(iv) Each microspore is a potential pollen or microspore mother cell.
(v) As the anthers mature and dehydrate, the microspores dissociate from each other and develop into pollen grains.
(vi) Inside each microsporangium several thousands of microspores or pollen grains are formed that are released with the dehiscence of anther.