Cell Division

Q. All the cells of a plant are descendents of zygote.

1. True

2. False

Q. According to Oparin and Haldane, during the course of origin of life what was the correct sequence of substances which appeared on earth?

1. methane, polysaccharides, monosaccharides
2. amino acids, ammonia, nucleic acids
3. protein, amino acids, nucleic acids
4. ammonia, amino acids, protein

Q. Biological macromolecule in which inheritable genetic information is stored

1. Carbohydrates
2. Proteins
3. Lipids
4. Deoxyribonucleic acid

Q. Which of the following are mismatched

1. somatic cell-2n
2. zygote-n
3. egg-n
4. gamete-n

Q. (a) Why must a cell be made 'competent' in bio-technology experiments? How does calcium ion help in doing so?

(b) State the role of 'biolistic gun' in biotechnology experiments. [3]

Q. (a) If a normal human cell has 46 chromosomes, how many chromosomes will be there in a human

(i) sperm cell, and

(ii) zygote ?

Q. Cell cycle includes

1. all of these
2. cell growth
3. protein synthesis
4. DNA replication

Q. According to Oparin and Haldane, during the course of origin of life what was the correct sequence of substances which appeared on earth?

1. methane, polysaccharides, monosaccharides
2. amino acids, ammonia, nucleic acids
3. protein, amino acids, nucleic acids
4. ammonia, amino acids, protein

Q. The DNA is contained within the nucleus of a eukaryotic cell, the proteins for which it codes are needed within the cytoplasm. Explain the roles of the following in the translation of the genetic code into an active enzyme in the cytoplasm DNA, mRNA, tRNA, rRNA, polysomes.

Q. How many meiosis division would be required to produce 101 female gametophytes in an angiosperm?

1. 26
2. 101
3. 127
4. Non above

Q. Which function will be lost if occipital lobe is damaged?

1. Hearing
2. Speech
3. Memory
4. Vision

Q. What would happen if the nuclear division is not followed by cytokinesis during mitosis?

1. Two cells, each with one nucleus is formed
2. Two cells without nucleus are formed
3. One cell with 2 nuclei is formed
4. One cell without a nucleus is formed

Q. Lampbrush chromosome found in the oocytes of amphibians is seen in

1. Leptotene
2. Diplotene
3. Pachytene
4. None of the above

Q. What is a callose plug in pollen tube ?

Q. The nucleolar chromatin contains gene for

1. B DNA
2. Z DNA
3. rRNA
4. Satellite DNA

Q. Biological macromolecule in which inheritable genetic information is stored

1. Carbohydrates
2. Proteins
3. Deoxyribonucleic acid
4. Lipids

Q. Tunnel vision is caused by

1. Drug addiction
2. Use of tobacco
3. Use of alcohol
4. Use of LSD

Q. Which of the following is false regarding growth in living organisms?

1. Growth in living organism is characterised by increase in mass and increase in number of cells
2. Multicellular organisms grow by cell division
3. In plants and animals, growth occurs continuously throughout their life span
4. Unicellular organisms also grow by cell division

Q. If meiosis occurs inside pollen grain and egg nuclei, it will be

1. Gametic meiosis
2. Zygotic meiosis
3. None of the above
4. Sporic meiosis

Q. Sporic meiosis occurs in

1. Animals
2. Thallophyta
3. Bryophyta
4. All plants except thallophyta