Botany
- The shorter and longer arms of a submetacentric chromosome are referred to as : Answer: 2. p-arm and q-arm respectively By convention the shorter arm of a chromosome is the p-arm (petite) and the longer arm is the q-arm.... 1
- Which of the following statements is not correct ? Answer: 4. Lysosomes are formed by the process of packaging in the endoplasmic reticulum. Lysosomes are membrane-bound vesicles holding hydr... 1
- Consider the following statements :(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.Select the correct option. Answer: 2. (A) is true but (B) is false. Statement A is true. A cofactor (organic or metal ion) that is tightly bound to the enzyme protein... 1
- Which of the following pair of organelles does not contain DNA ? Answer: 3. Lysosomes and Vacuoles Mitochondria and chloroplasts contain their own DNA, and the nucleus holds the cell's DNA. Lysosomes and v... 1
- Which of the following pairs of gases is mainly responsible for green house effect ? Answer: 4. Carbon dioxide and Methane The main greenhouse gases are CO₂ , CH₄ , N₂O and CFCs. Among the options, carbon dioxide and methane... 1
- Which of the following is the most important cause for animals and plants being driven to extinction ? Answer: 1. Habitat loss and fragmentation The "evil quartet" lists the causes of biodiversity loss. The most important is habitat loss and f... 1
- Which one of the following is not a method of *in situ* conservation of biodiversity ? Answer: 3. Botanical Garden In situ conservation protects species in their natural habitat: biosphere reserves, sanctuaries, national parks... 1
- Purines found both in DNA and RNA are : Answer: 2. Adenine and guanine The purines are adenine and guanine, and both are present in DNA and RNA. Thymine and cytosine are pyrimidine... 1
- Select the incorrect statement. Answer: 3. In domesticated fowls, sex of progeny depends on the type of sperm rather than egg. We look for the incorrect statement. Male fru... 1
- Respiratory Quotient (RQ) value of tripalmitin is : Answer: 2. 0.7 RQ=volume of CO₂ released/volume of O₂ used . Tripalmitin (a fat) oxidises as mathrm2C₅₁H₉₈O₆ + 145 O₂ → 102 CO₂ + 98 H₂O . R... 1
- Which one of the following statements regarding post-fertilization development in flowering plants is incorrect ? Answer: 4. Ovules develop into embryo sac After fertilisation: ovary becomes fruit, ovule becomes seed, zygote becomes embryo, and the prima... 1
- Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following : Answer: 2. Flaccidity of bulliform cells Grass leaves have large thin-walled bulliform (motor) cells in the upper epidermis. In dry weather... 1
- The Earth Summit held in Rio de Janeiro in 1992 was called : Answer: 2. for conservation of biodiversity and sustainable utilization of its benefits. The 1992 Earth Summit at Rio de Janeiro (the UN Con... 1
- Which of the following organisms are known as chief producers in the oceans ? Answer: 3. Diatoms Key idea: Diatoms are the chief producers in the oceans. These are abundant photosynthetic protists (golden-brown algae)... 1
- Select the incorrect match : Answer: 4. Polytene Chromosomes – Oocytes of amphibians Key idea: Check each pair. Lampbrush chromosomes are diplotene bivalents (in amphibi... 1
- Which of the following events does not occur in rough endoplasmic reticulum ? Answer: 4. Phospholipid synthesis Key idea: The rough ER has ribosomes and handles proteins that enter its lumen. Protein folding, cleavage... 1
- Ciliates differ from all other protozoans in Answer: 4. having two types of nuclei Key idea: Ciliated protozoans such as Paramecium have two types of nuclei: a large macronucleus and on... 1
- All of the following are part of an operon except Answer: 2. an enhancer Key idea: A prokaryotic operon has structural genes, a promoter and an operator (and a regulatory gene nearby). An en... 1
- A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by Answer: 4. Both sons and daughters Key idea: A woman has two X chromosomes and passes one at random to each child. Each child (son or daught... 1
- Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as Answer: 1. Polysome Key idea: A string of ribosomes on one mRNA, each making a copy of the polypeptide, is a polysome (polyribosome). A nucl... 1
- AGGTATCGCAT is a sequence from the coding strand of a gene. What will be the corresponding sequence of the transcribed mRNA ? Answer: 1. AGGUAUCGCAU The coding strand has the same sequence as the mRNA, with U in place of T (the template strand is the one complementa... 1
- Which of these statements is incorrect ? Answer: 4. Oxidative phosphorylation takes place in outer mitochondrial membrane. Key idea: Check where each respiratory step occurs. TCA cy... 1
- Conversion of milk to curd improves its nutritional value by increasing the amount of Answer: 2. Vitamin B ₁₂ Key idea: Lactic acid bacteria (LAB) turn milk into curd. LAB also add to the nutritional value of curd by increasin... 1
- Which one of the following population interactions is widely used in medical science for the production of antibiotics ? Answer: 4. Amensalism Key idea: In amensalism one species is harmed while the other is unaffected. Antibiotics are chemicals secreted by mic... 1