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Selaginella and Salvinia are considered to represent a significant step towards the evolution of seed habit because:
The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as :
Pills, implants and IUDs are very effective if taken within __________ of coitus.
A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $\mu_1$ and $\mu_2$ and $R$ is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is:
Read the following statements and choose the correct statement:
When a tall pea plant with round seeds was selfed, it produced the progeny of tall plants with round seeds and some dwarf plants with wrinkled seeds. The genotype of the parent is:
Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?
Which of the following statements regarding mitochondria is incorrect?
Given are the following five statements (I - V) for your consideration: I: In Equisetum, the female gametophyte is retained on the parent sporophyte II: In Ginkgo, the male gametophyte is not independent III: The sporophyte in Marchantia is more developed than that in Polytrichum IV: Sexual reproduction in Volvox is isogamous V: The spores of slime moulds lack cell walls How many of the above statements is/are correct?
Which of the following is the correct sequence of events in the origin of life? I: Formation of protobionts. II: Synthesis of organic monomers. III: Synthesis of organic polymers. IV: Formation of DNA-based genetic systems.
Emerson’s enhancement effect and red drop have been instrumental in the discovery of?
For radioactive material, the half-life is 10 minutes. If initially, there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is:
Match List I with List II: List I (Types of stamens) A. Monoadelphous B. Diadelphous C. Polyadelphous D. Epiphyllous List II (Example) I. Citrus II. Pea III. Lily IV. China-rose
What is the genetic disorder in which an individual has an overall masculine development gynaecomastia, and is sterile?
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): FSH which interacts with membrane bound receptors does not enter the target cell. Reason (R): Binding of FSH to its receptors generates second messenger (cyclic AMP) for its biochemical and physiological responses. In the light of the above statements, choose the most appropriate answer from the options given below:
Two bodies of mass $4 \text{ kg}$ and $6 \text{ kg}$ are tied to the ends of a massless string. The string passes over a pulley, which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity ($g$) is:
Match List-I with List-II: List-I A. Cells are metabolically active and proliferate (grow) B. DNA replication takes place C. Proteins are synthesised in preparation for mitosis D. Quiescent stage with metabolically active cells List-II I. G2 phase II. G1 phase III. G0 phase IV. S phase
Monascus purpureus is the yeast used commercially in the production of:
Match the items given in Column I with those in Column II and select the correct option given below : Column-I a. Eutrophication b. Sanitary landfill c. Snow blindness d. Jhum cultivation Column-II i. UV-B radiation ii. Deforestation iii. Nutrient enrichment iv. Waste disposal
A square current carrying loop is suspended in a uniform magnetic field acting in the plane of the loop. If the force on one arm of the loop is $\vec{F}$, the net force on the remaining three arms of the loop is