Related Questions

Consider the following statements regarding the germination of pollen grain and choose the correct answer:
1. The content of the pollen is a true male gametophyte
2. The pollen tube comes out due to the protrusion of the exine through the germ pore
3. When the pollen grain has germinated, the pollen tube penetrates the stigma through the stigmatic papillae
4. Some stigmas have a continuous cuticle in which pollen tubes penetrate by enzyme action
Consider the following statements and choose the correct answer:
1. In angiosperms the pollination consists of transference of the pollen grains from the anther to the stigma either by self-pollination or by cross-pollination
2. Pollen grain is shed from the pollen sac in the two-celled stage
3. The exine of each microspore grows out into a tube, called the pollen tube
4. The growth of pollen tube is stimulated by sugary substances secreted by the stigma
P, Q, R, Sand T are five crops that Babu grows. T is fast growing and more water demanding than R which gives more yield than T. P gives more yield than R and grows faster than Q. Q is more water demanding than T but is second lowest yielder, S is the slowest growing and least water demanding of all crops but gives highest yield. R is more water demanding and grows faster than P. Select the crop or crops that has/ have as many as crops that are more water demanding and as many as crops that give less yield than it. 
Consider the following statements.
1. Chloroplast is known as 'cell with in cell organelle.'
2. Chloroplast is the largest cell organelle found in plant cells.
3. Chloroplast have single stranded extrachromosomal DNA.
Which of the above statement(s) is/are correct?
Consider the following statements regarding Xenia and choose the correct answer:
1. If a white variety (yy) is pollinated with pollen from a yellow variety (YY), one of the male gametes (Y) will unite with the egg (y) to produce a hybrid embryo (Yy) which will act as a heterozygote for yellow endosperm in the next generation
2. The second male gamete (Y) will unite with the two polar nuclei (y, y) and produces the primary endosperm nucleus (Yyy) which is triploid
3. If a yellow endosperm variety (YY) is crossed with pollen from a white grained variety, the grains produced are white like the pollen parent
For successful inter-cropping, which of these conditions are required to be ideally fulfilled? I. Competition for light should be minimum among the different crops sown. II. Complementarity must exist between crops sown. III. The time of peak nutrient demand of component crops should not overlap. IV. The difference in maturity of component crops should be at least 120 days.
Which type of the following crops sows in UP state? 1. Kharif Crops 2. Rabi Crops 3. Zaid crops
Consider the following statements.
1. Rice and tobacco are the major crops of Andhra Pradesh.
2. Rice and tea are the major crops of Paschim Banga.
3. Rice and jowar are the major crops of Odisha.
4. Rice and Coffee are the major crops of Tamil Nadu.
Which of these are correct?
Chloroplast localization signals consist of two adjacent signal peptides, one for targeting the proteins to the stromaportion of the chloroplast before being cleaved and the other for targeting the remaining portion of the proteins to the thylakoids.
For transformation of the chloroplast of higher plants, a vector is used which ______ in the chloroplast.