Students prepared a slide of onion root tip. There were many cells seen under microscope. There was a cell seen under microscope. There was a cell with two groups of chromosomes at opposite ends of the cell. This cell is in which phase of mitosis?
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Onion cells have no chloroplast. How can we tell they are plants?
1. The bulb of an onion is a modified form of leaves. 2. While photosynthesis takes place in the leaves (present above the ground) of an onion containing chloroplast, the little...
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Observe the cells from buccal epithelium stained with Giemsa under microscope.
The following observations are made when cells from buccal epithelium stained with Giemsa: 1. Cheek cells are flat and irregular in shape. 2. These cells lack cell wall. A distinct blue nucleus...
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Who observed cells under the microscope for the first time?
Robert Hooke observed cells under the microscope for the first time. [Note. Cell walls were first observed by Robert Hooke (1665) as he looked through a microscope at dead cells from...
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A given object taken double time to slide down a `45^(@)` rough incline as it takes to slide down a perfectly smooth `45^(@)` incline. The coefficient
Correct Answer - C `sqrt((2s)/(g sin 45^(@) - mu g cos 45^(@))) = 2 xx sqrt((2s)/(g sin 45^(@)))` `(1)/(((1)/(sqrt2) - (mu)/(sqrt2))) = (4)/(((1)/(sqrt2)))` `1 = 4 (1 - mu)` `mu =...
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While observing a slide, student observed many cells with nuclei. But some of the nuclei were bigger as compared to others
Answer is Prophase
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If an onion has 16 chromosomes in its leaf cell, how many chromosomes will be there in its root cell and pollen grain.
1. The chromosomes in root cell will be 16 as root cell is a diploid cell. 2. The chromosomes in pollen grain will be 8 as pollen grain is a haploid...
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The cost of 4 kg onion, 3 kg wheat and 2 kg rice is Rs 60. The cost of 2 kg onion, 4 kg wheat and 6 kg rice is Rs 90. The cost of 6 kg onion 2 kg whea
Let the cost of 1 kg wheat and 1 kg rice be ₹x, ₹ y and ₹ z respectively Given that , 4x+3y+2z=60 2x+4y+6z=90 6x+2y + 3z = 70 `rArr"...
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A student was observing a slide with no label under microscope. The section had some vascular bundles scattered in the ground tissue.
1. In fern rachis, the number of vascular bundles is less as compared to number of vascular bundles in monocot stem. In monocot stem, vascular bundles are numerous. 2. In fern...
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In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order
Correct Answer - a In a longitudinal section of root , starting from the tip upward the four zones occur in the following order Root cap `to ` Zone of cell...
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A smooth block is released at rest on a `45^(@)` inclined and then slides a distance d. the time taken to slide is n times as much to slide on rough i
`t_(1)=sqrt((2d)/(g sin45^(@)))=sqrt((2d)/((g)/sqrt(2)))` `t_(2)=sqrt((2d)/(((g)/(sqrt(2))-mu(g)/(sqrt(2))))` `t_(2)=nt_(1)` `sqrt((2d)/(((g)/(sqrt(2))-mu(g)/(sqrt(2)))))=nsqrt((2d)/((g)/(sqrt(2))))` `(1)/(sqrt(1-mu))=n` `(1)/(1-mu)=n^(2)` `1 = n^(2)-n^(2)mu` `(1)/(n^(2))=-1-mu` `mu=(1-(1)/(n^(2)))`
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