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Given below is a diagrammatic sketch of a portion of the human male reproductive system. Select the correct set of the names of the parts labelled A, B, C, and D:
What is true for surgical methods? I: Also called sterilization II: Terminal method of contraception III: Block gamete transport IV: Called vasectomy in females and tubectomy in males V: High reversibility and contraceptive efficiency
Pills: I. Inhibit ovulation and implantation II. Alter the quality of cervical mucus to prevent or retard the entry of sperms III. Prevent the ejaculated semen from entering the female vagina IV. Inhibit spermatogenesis Which of the above statements are correct?
A particle executes linear simple harmonic motion with an amplitude of 3 cm. When the particle is at 2 cm from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then, its time period in seconds is:
Match the items given in Column-I with those in Column-II and select the correct option given below: Column-I (a) Cristae (b) Cisternae (c) Thylakoids Column-II (i) Flat membranous sacs in stroma (ii) Infoldings in mitochondria (iii) Disc-shaped sacs in Golgi apparatus
Which of the following velocity-time graphs shows a realistic situation for a body in motion?
To avoid transmission of STDs: I. Avoid sex with multiple partners. II. Always have unprotected sex. III. Use condoms during coitus. IV. Avoid sex with unknown partners V. Avoid sharing of needles Which of the above statements are correct?
Match List-I with List-II. **List-I (Graphs)** (a) Displacement-time graph with decreasing amplitude (Damped) (b) Displacement-time graph with constant amplitude (Undamped) (c) Force-displacement graph (Linear relationship, F = -kx) (d) Energy-time graph (Constant total energy) **List-II (Situations)** (i) Total mechanical energy is conserved (ii) Bob of a pendulum is oscillating under negligible air friction (iii) Restoring force of a spring (iv) Bob of a pendulum is oscillating along with air friction Choose the correct answer from the options given below:
Antiparallel strands of a DNA molecule mean that:
The centriole undergoes duplication during:
Given below are two statements: Statement I: The release of sperms into the seminiferous tubules is called spermiation. Statement II: Spermiogenesis is the process of formation of sperms from spermatogonia. In the light of the above statements, choose the most appropriate answer from the options given below:
In a diffraction pattern due to a single slit of width $a$, the first minimum is observed at an angle $30^\circ$ when light of wavelength $5000\text{ \AA}$ is incident on the slit. The first secondary maximum is observed at an angle of
Given below are two statements: Statement I: Degeneration of corpus luteum in the absence of fertilization is the cause for disintegration of endometrium. Statement II: Cyclic menstruation indicates normal reproductive phase in human females and extends between menarche and menopause. In the light of the above statements, choose the correct answer from the options given below:
Identify the incorrect statement regarding surgical birth control methods:
Birth control pills contain synthetic estrogen and progesterone. How might these hormones prevent pregnancy?
A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts an amount of heat $Q$ in time $t$. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What is the amount of heat conducted by the new rod when placed in thermal contact with the two reservoirs in time $t$?
Select the correct option of haploid cells from the following groups:
The correct sequence of phases in cell cycle is:
Jacob and Monod studied lactose metabolism in E. Coli and proposed the Operon concept. The Operon concept is applicable to:
An example of colonial alga is: