Question 1 The displacement in metres of a body varies with time t in second as y = t^2 – t – 2. The displacement is zero for a positive of t equal to (a) 1 s (b) 2 s (c) 3 s (d) 4 s
Question 2. A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns to A. If he takes two hours to do so, his speed is (a) 3 km/h (b) zero (c) 2 km/h (d) 1.5 km/h
Question 3. A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is (a) 10 s (b) 12 s (c) 9 s (d) 6 s
Question 4. A body starts from rest and travels with uniform acceleration on a straight line. If its velocity after making a displacement of 32 m is 8 m/s, its acceleration is (a) 1 m/s² (b) 2 m/s² (c) 3 m/s² (d) 4 m/s²
Question 5. Which one of the following is the unit of velocity? (a) kilogram (b) metre (c) m/s (d) second
Question 6. A body starts from rest and travels for t second with uniform acceleration of 2 m/s². If the displacement made by it is 16 m, the time of travel t is (a) 4 s (b) 3 s (c) 6 s (d) 8 s
Question 7. Odometer measures – (a) Speed (b) Distance (c) Time (d) Average speed
Question 8. An athlete finishes a round of circular track of radius R in 40 sec. What is his displacement at the end of 2 min 20 sec?
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Science is the systematic Knowledge of a particular subjects with causes and effects.
Science is the pursuit and application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence, Experiment and/or observation as benchmarks for testing hypotheses.
(According to Reduced Syllabus by Board exam 2021)
(FOR CBSE & UP BOARD EXAM 2021)
Life processes:
‘Living Being’. Basic concept of nutrition, respiration, transport and excretion
in plants and animals.
Reproduction:
Reproduction in animals and plants (asexual and sexual) reproductive healthneed
and methods of family planning. Safe sex vs HIV/AIDS. Child bearing and women’s
health. Heredity: Heredity; Mendel’s contribution- Laws for inheritance of
traits: Sex determination: brief introduction;
Our environment: Eco-system, Environmental problems, Ozone depletion, waste production and their solutions. Biodegradable and non-biodegradable substances.
Veins have thin walls because the blood there is no longer under pressure and they have valves to ensure blood flow in one direction
Fragmentation. Asexual
The inner lining of the small intestine has numerous finger-like projections called villi which increase the surface area for absorption
Goat because herbivores eating grass need a longer small intestine to allow the cellulose to be digested..
The pancreas secretes digestive juice which contains enzymes like trypsin for digesting proteins and lipase for breakdown of emulsified fats.
b) Both Assertion & Reasoning are correct, Reason is not correct explanation of Assertion
b) Both Assertion & Reasoning are correct, Reason is not correct explanation of Assertion
ATP, Adenosine Tri Phosphate.
Transport of food from leaves to other parts of the plant is called translocation.
Fungi – saprophytic, Amoeba — animal like nutrition
Crotons, money plant.
23 pairs.
The trait which represents the tallness in a pea plant is dominant over the another trait, shortness (dwarf).
Garden pea (Pisum sativum).
(b)
(d)
(a)
(d)
(d)
(a)
(b)
(b)
(b)
(b)
(c)
Trait B is likely to have arisen earlier as it occurs in more number.
(c )
Respiratory pigment, haemoglobin is present in red blood cells. Haemoglobin has affinity for O2 thus helping in its transport
(A) Vegetative propagation can be practised for growing such plants which usually do not produce seeds or produce non-viable seeds.
(B) Pollen grains contain male gametes and ovules contains female gametes in plants.
30. Water re-absorption occurs through villi, undigested food is stored in rectum and thrown out through anus. Exit is regulated by anal sphincter.
31. (A) Heredity (B) Fission.
32. In case of human beings female sex have a pair of chromosomes (sex) and male sex have a pair of XY sex chromosome. When the crossing of male and female gametes takes place then the sex of the child determined as follows:
This shows that the ratio of male: female
sex of the child is same i.e., (1 : 1), 50% possibility of each is seen here.
33. Seminal vesicles are a pair of thin-walled muscular and elongated sacs which secrete a fluid for nourishment of sperms.
Prostate glands also produce a fluid which is released in the urethra along with secretion of seminal vesicle. It affects the vaginal pH so that sperms move smoothly inside the vagina.
34. In asexual reproduction, the offspring is almost identical to the parent because they have the same gene as their parent. Thus, variation is not present.
Sexual reproduction involves fusion of male and female gametes. The offspring exhibits diversity of characters because they receive some genes from the mother and some from the father. The mixing of genes in different combinations, results in genetic variations. This variation leads to the continuous evolution of various species to produce various organisms.
35.
36. The reasons for adopting contraceptive methods could be:
1. Protection from sexually
transmitted diseases such as HIV-AIDS, gonorrhoea, syphilis, warts etc.
2. Restricting the number of
children.
3. Sufficient
gap between successive births.
4.
Enjoying a good reproductive health.
5. Controlling population.
37. (i) Water: Roots absorb it from the soil.
(ii) Carbondioxide: Stomata in
leaves allow the carbon dioxide gas to enter into the plant.
(iii) Chlorophyll: It is already present
in the leaves.
(iv) Sunlight: From the sun.
38.
OR
(a). (A) Hydra (B) Rhizopus
(C) Bryophyllum (D) Planaria
(b) Asexual mode of reproduction
(c ) (i) Only one individual is required. (ii) Progeny is identical like parents (iii) Produced in large number (Any two)
39. (a) Rr and Rr.
(b) Red colour of flowers is the dominant trait while white colour is the recessive trait.
(c) Monohybrid cross, phenotypic ratio is 3 : 1.
40.
Blood passes through filtration
units in the kidney called nephron
– Passes through
glomerulus in the Bowman’s capsule
–Ultra filtration – Filtrate initially has
glucose, amino acids, water, salts and nitrogenous waste – Reabsorption
– Water (as per the need
of the body),
Glucose and amino acids
are all reabsorbed
– – Secretion of excess
water, salts and urea (nitrogenous waste) which makes up the urine
41. (A) Heating of lead nitrate; and electrolysis of acidified water
(B) Oxygen is
carried by haemoglobin present in the RBC of the blood, carbon dioxide is
soluble in water and hence is transported by the blood in dissolved form.
42.
The kidneys (renal glands) like high in the abdominal cavity near and on both sides
of the vertebral column.
The right kidney is slightly lower than
the left to make room for the liver. Each kidney is bean shaped
and the
concave portion faces
medially. The kidney collects and transports urine from the kidney to ureters.
The kidneys regulate:
The volume of blood plasma (blood pressure).
The concentration of waste products in the blood (excretion).
The concentration of electrolytes such as Na+, K+,
HCO3- and other ions (osmoregulation).
The pH of plasma.
OR
The
fusion of male gamete with female gamete is known as fertilization.
Menstruation
cycle takes place every month when egg is not fertilized. It lasts for about
two to eight days and during this cycle the lining of uterus slowly breaks and
comes out through the vagina as blood and mucus.
Binary
fission is the splitting of nucleus into two daughter cells which can take
place in any plane. It can be observed in Amoeba.
When
vegetative part of a plant like the root, stem or leaves develops into new
plant under appropriate conditions, it is known as vegetative propagation.
When
body of an organism cuts into any number of pieces and each piece grows into a
complete organism. This is known as regeneration. Hydra and Planaria reproduce
through this process.
