#neet
- The morphological nature of the edible part of coconut is : Answer: 2. Endosperm The edible white kernel of coconut is its endosperm. Coconut water is free-nuclear liquid endosperm, and the white kern... 1
- Myelin sheath is produced by : Answer: 4. Schwann Cells and Oligodendrocytes The myelin sheath is formed by glial cells that wrap around axons. In the peripheral nervous s... 1
- Match the following sexually transmitted diseases (Column - I) with their causative agent (Column - II) and select the correct option.Column - I: (a) Gonorrhea (b) Syphilis (c) Genital Warts (d) AIDSColumn - II: (i) HIV (ii) Neisseria (iii) Treponema… Answer: 4. (ii) (iii) (iv) (i) Match each disease with its pathogen. (a) Gonorrhea: Neisseria gonorrhoeae = (ii) (b) Syphilis: Treponema pal... 1
- Which among these is the correct combination of aquatic mammals ? Answer: 2. Whales, Dolphins, Seals Aquatic mammals are mammals that live in water: whales, dolphins and seals. Trygon (sting ray) and sharks... 1
- A dioecious flowering plant prevents both : Answer: 1. Autogamy and geitonogamy A dioecious plant bears male and female flowers on separate plants. Autogamy (pollen to stigma of the sa... 1
- Which of the following are found in extreme saline conditions ? Answer: 4. Archaebacteria Archaebacteria live in harsh habitats: extreme halophiles in very salty places, thermoacidophiles in hot springs,... 1
- Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen ? Answer: 2. Mycoplasma The description fits Mycoplasma. Smallest living cells. No cell wall, so they are pleomorphic. Pathogenic to plants an... 1
- With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ? Answer: 2. C₃ plants respond to higher temperatures with enhanced photosynthesis while C₄ plants have much lower temperature optimum The wro... 1
- Life cycle of Ectocarpus and Fucus respectively are : Answer: 2. Haplodiplontic, Diplontic Ectocarpus is a brown alga with alternation of generations, so its life cycle is haplodiplontic. Fucus... 1
- The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as : Answer: 4. Core zone A biosphere reserve has three zones. Core zone: legally protected, no human activity allowed. Buffer zone: limited rese... 1
- A gene whose expression helps to identify transformed cell is known as : Answer: 4. Selectable marker A selectable marker is a gene whose expression lets us identify and select transformed cells, for example an an... 1
- Which of the following components provides sticky character to the bacterial cell ? Answer: 3. Glycocalyx The glycocalyx is the outer layer of the bacterial cell envelope, made of polysaccharide (and sometimes protein). It i... 1
- The final proof for DNA as the genetic material came from the experiments of : Answer: 1. Hershey and Chase Hershey and Chase used radioactive ³²P (labels DNA) and ³⁵S (labels protein) in bacteriophages. Only the DNA en... 1
- Fruit and leaf drop at early stages can be prevented by the application of : Answer: 2. Auxins Auxins prevent early fruit and leaf drop (abscission) in plants. Ethylene promotes abscission and ripening, so it does the... 1
- Which one of the following statements is not valid for aerosols ? Answer: 2. They cause increased agricultural productivity Aerosols are fine particles in the air. They change rainfall and monsoon patterns,... 1
- Which of the following options gives the correct sequence of events during mitosis ? Answer: 1. condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase The correct... 1
- In Bougainvillea thorns are the modifications of : Answer: 2. Stem The thorns of Bougainvillea are modified stems (axillary buds changed into hard, pointed thorns). They protect the plant fro... 1
- If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ? Answer: 2. 33 Deleting one base causes a frameshift, so every codon after the deletion point is read differently. Codon 300 covers bases 898... 1
- Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections ? Answer: 1. Cell - mediated immune response Graft rejection is due to cell-mediated immune response, carried out by T-lymphocytes that recogn... 1
- Select the correct route for the passage of sperms in male frogs : Answer: 3. Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca In a male frog, sperms travel: testes → vasa effe... 1
- A temporary endocrine gland in the human body is : Answer: 2. Corpus luteum The corpus luteum forms from the ruptured Graafian follicle after ovulation, secretes progesterone, and degenerates... 1
- Which of the following in sewage treatment removes suspended solids ? Answer: 2. Primary treatment Primary treatment of sewage is physical: filtration and sedimentation remove floating and suspended solids. Sec... 1
- Spliceosomes are not found in cells of : Answer: 3. Bacteria Key idea: Spliceosomes remove introns from hnRNA (pre-mRNA) in eukaryotes. Fungi, animals and plants are eukaryotes and... 1
- Which ecosystem has the maximum biomass ? Answer: 4. Forest ecosystem Key idea: Biomass depends on the amount and size of the living organisms. A forest has large trees and a very la... 1