Name the following: (i) The organelle that forms the aster during cell division. (ii) A genetic disorder in which the blood does not clot. (iii) The permanent stoppage of menstruation in human females around the age of 45 years. (iv) The openings on the barks of trees through which transpiration occurs. (v) A gaseous plant hormone which promotes ripening of fruits.

Ramesh is a farmer who has a vineyard and cultivates grapes. To improve the shape of the grapes and make them elongated he sprays a particular phytohormone at the time of fruiting. (a) Name the phytohormone that Ramesh sprays on the plant at the time of fruiting. (b) These grapes are said to be seedless. What is the technical term for the formation of such fruits?

Ali has some pea plants in his garden which need a support to grow as seen in the picture given below: (a) Name the phenomenon depicted by the shoot in the given figure. (b) Define the above phenomenon. (c) Write the name of the part marked X.

Assertion (A): Abscisic acid promotes stomatal closure during a drought. Reason (R): Abscisic acid helps the plant to conserve water during stress. (a) (A) is true and (R) is false (b) (A) is false and (R) is true (c) Both (A) and (R) are true and (R) is the correct explanation of (A). (d) Both (A) and (R) are true and (R) is not the correct explanation of (A).

Name the following: (a) Unicellular outgrowths of the epidermis of roots. (b) The defect of the eye in which some parts of an object are focused while other parts appear blurred. (c) The tropic movement in response to chemicals. (d) The main nitrogenous waste in the human body. (e) The attachment of the fertilized ovum to the wall of the uterus.

Sunil tried to match the tropic movements in plants with the stimulus they respond to. Tropism Stimulus P Thigmotropism Touch Q Geotropism Water R Chemotropism Chemicals S Phototropism Gravity Identify the correct pair: (a) P and R (b) Q and S (c) R and S (d) P and S

Choose the odd one out from the following terms and name the category to which the others belong: (a) Auxin, Oxytocin, Gibberellin, Cytokinin (b) Growth Hormone, Vasopressin, Thyroid Stimulating Hormone, Gonadotropic Hormone (c) Urochrome, Urea, Uric acid, Nucleic acid (d) Cervix, Chordae Tendinea, Papillary Muscles, Sinoatrial node (e) Morula, Blastocyst, Oviduct, Foetus

Give the biological/technical terms for the following: (a) The tropic movement wherein the tendrils of a pea plant twine around a support. (b) A defect in our eye in which some parts of the object are in focus while the other parts are blurred. (c) The type of waste generated in hospitals and pathological laboratories. (d) The surgical technique for females that can be used to prevent pregnancy. (e) The evolutionary process by which new species arise from the existing one.

Vineet’s day begins with a cup of piping hot coffee. Caffeine is a stimulant present in coffee which increases the circulation of Adrenaline in the body. Vineet feels refreshed, alert and focussed. (a) Name the organ that is stimulated by caffeine which makes Vineet alert and focussed. (b) Give the collective term for the protective membranes of the organ mentioned in (a). (c) Which part of the autonomic nervous system increases the secretion of Adrenaline?

Draw a neat, labelled diagram to show that oxygen is released during photosynthesis.

Given below is the diagram of a plasmolysed cortical cell of a root. Copy the diagram and label the following parts: (a) Cytoplasm (b) Hypertonic solution (c) Plasma membrane

A farmer cultivates a unique species of tomato plants. The two traits selected for breeding were: Colour of the fruits and height of the plants. The farmer initially crosses a homozygous tall plant bearing red fruits (TTRR) with a dwarf plant bearing yellow fruits (ttrr) and the genotype of all the offsprings of the F1 generation was TtRr. Next, he crosses two F1 generation plants (TtRr). (a) Explain the phenotype of the offsprings of the F1 generation obtained from the initial cross. (b) Mention the phenotypic ratio of the F2 generation offsprings. (c) State Mendel's Law of Independent Assortment.